Methods and systems for producing magnetic materials

Abstract

This invention relates to systems and methods for producing magnetic materials. The method includes providing an alloy mixture. The composition of the alloy is not particularly limited. The method includes melting the alloy mixture to obtain a molten alloy mixture. The method includes performing a melt spinning process, rapidly solidifying the molten alloy mixture by a rotating wheel to obtain a primary metal strip. The primary metal strip has elongated, flat bodies with a bottom side and a top side opposite to the bottom side. The method includes performing a grain size refinement and homogenization process, said grain size refinement and homogenization process including directly supplying a first coolant to at least a central region of the top side and / or bottom side of the primary metal strip to obtain a final metal strip.

Description

Technical Field

[0001] This invention relates generally to systems and methods for producing magnetic materials, and more specifically, to improved melt spinning systems and methods for producing magnetic materials. Background Technology

[0002] Melt spinning is a process used to produce magnetic materials. A typical melt spinning process involves feeding molten material onto a rotating wheel or similar object. The molten material rapidly solidifies (or rapidly quenches) upon contact with the frozen or cooled surface of the rotating wheel, forming a thin metal strip. Generally, the flow rate of the molten material applied to the rotating wheel is selected based on factors such as the rotational speed of the wheel. The flow rate and rotational speed used in the melt spinning process, in turn, affect the thickness of the produced metal strip, the yield (production volume), the grain size, the running time of the rotating wheel, and the magnetism of the magnets formed from these metal strips. Summary of the Invention

[0003] When producing magnetic materials using conventional melt spinning processes and systems, a metal ribbon is formed by rapidly solidifying (or rapidly quenching) a molten alloy mixture. This metal ribbon has a very fine, nanoscale grain size. Regardless of the process used to form the magnet from the metal ribbon, the fine and uniform grain size throughout the metal ribbon is crucial for the final magnet's magnetic properties (such as remanence and coercivity).

[0004] Conventional melt spinning processes and systems often suffer from non-uniform grain size in metal ribbons, particularly across the ribbon width. More specifically, the average grain size in the central region of a metal ribbon formed using a conventional melt spinning process is larger than the average grain size on the sides (and / or edges), resulting in non-uniform grain size. In this invention, it is recognized that this variation in average grain size is a direct result of the central region receiving less cooling than the sides (and / or edges) during rapid curing.

[0005] This invention generally relates to systems, subsystems, methods, and processes for solving conventional problems, including those described above and in this invention, and more specifically, exemplary embodiments relate to systems, subsystems, methods, and processes for producing magnetic materials.

[0006] In one exemplary embodiment, a method for producing a magnetic material is described. The method includes providing an alloy mixture. The composition of the alloy is not particularly limited. The method includes melting the alloy mixture to obtain a molten alloy mixture. The method includes rapidly solidifying the molten alloy mixture through a melt spinning process using a rotating wheel to obtain a primary metal strip. The primary metal strip has elongated, flat bodies with a bottom side and a top side opposite to the bottom side. The method includes performing a grain size refinement and homogenization process, which includes directly delivering a first coolant to at least the central region of the top side and / or bottom side of the primary metal strip to obtain a final metal strip.

[0007] The first coolant supplied to at least the central region of the top and / or bottom sides of the primary metal strip may comprise a stream of liquid argon, liquid helium, and / or one or more other liquid inert gases. The grain size refinement and homogenization process may include directly supplying the first coolant to at least the central region of the top and / or bottom sides of the primary metal strip. The average grain size of the central portion of the final metal strip may be at least 5% smaller than the conventional average grain size of the central portion of a conventional metal strip produced by conventional methods; conventional methods may include rapidly solidifying the molten alloy mixture using a melt spinning process with a rotating wheel, without performing the grain size refinement and homogenization process. The average grain size of the central portion of the final metal strip may be at least 10% smaller than the conventional average grain size of the central portion of a conventional metal strip produced by conventional methods. The flow rate of the molten alloy mixture supplied to the rotating wheel can be at least 10% greater than the conventional flow rate; rapid solidification can include rotating the rotating wheel at a first-round speed; the average grain size of the central portion of the final metal strip can be at least 5% smaller than the conventional average grain size of the central portion of a conventional metal strip produced by conventional methods; the conventional flow rate is the maximum flow rate in conventional methods for producing conventional metal strips; and the conventional method can include supplying the molten alloy mixture to the rotating wheel rotating at the first-round speed without performing grain size refinement and homogenization processes. The flow rate of the molten alloy mixture supplied to the rotating wheel can be at least 30% greater than the conventional flow rate; the average grain size of the central portion of the final metal strip can be at least 10% smaller than the conventional average grain size of the central portion of a conventional metal strip produced by conventional methods. The difference between the average grain size of the central portion of the final metal strip and the average grain size of the edge portion of the final metal strip can be less than 10%. The difference between the average grain size of the central portion of the final metal strip and the average grain size of the edge portion of the final metal strip can both be less than 10%. The difference between the average grain size of the central portion and the average grain size of the edge portion of the final metal ribbon can be less than 5 nm. The difference between the average grain size of the central portion and the average grain size of the edge portion of the final metal ribbon can both be less than 5 nm. The average grain size of both the central and edge portions of the final metal ribbon can be less than 50 nm. The average grain size of the central portion of the final metal ribbon can be less than 50 nm. The difference between the average grain size of the central portion and the average grain size of the edge portion of the final metal ribbon can be less than 5%. The difference between the average grain size of the central portion and the average grain size of the edge portion of the final metal ribbon can both be less than 5%. The difference between the average grain size of the central portion and the average grain size of the edge portion of the final metal ribbon can be less than 2 nm.The difference between the average grain size of the central portion and the average grain size of the edge portion of the final metal strip can both be less than 2 nm. The average grain size of both the central and edge portions of the final metal strip can be less than 40 nm. The average grain size of the central portion of the final metal strip can be less than 40 nm. The alloy mixture can contain RE-Fe-Co-MB, where RE is one or more rare earth elements, and M is one or more elements selected from Ga, Cu, Al, Nb, Zr, W, Ti, Si, C, and Mo.

[0008] In another exemplary embodiment, a method for producing a magnetic material is described. The method includes providing an alloy mixture; melting the alloy mixture to obtain a molten alloy mixture; and rapidly solidifying the molten alloy mixture through a melt spinning process using a rotating wheel to obtain a primary metal strip. The primary metal strip has an elongated, flat body with a bottom side and a top side opposite to the bottom side. The method includes performing a grain size refinement and homogenization process, which includes directly delivering a first coolant to at least the central region of the top side and / or bottom side of the primary metal strip to obtain a final metal strip.

[0009] The difference between the average grain size of the central region on the bottom side of the final metal strip and the average grain size of the edge portion on the bottom side of the final metal strip can be less than 10%, or preferably less than 5%. The difference between the average grain size of the central region on the top side of the final metal strip and the average grain size of the edge portion on the top side of the final metal strip is less than 10%, or preferably less than 5%. The difference between the average grain size of the central region on the bottom side of the final metal strip and the average grain size of the edge portion on the bottom side of the final metal strip can be less than 5 nm, or preferably less than 2 nm. The difference between the average grain size of the central region on the top side of the final metal strip and the average grain size of the edge portion on the top side of the final metal strip can be less than 5 nm, or preferably less than 2 nm. The first coolant delivered to at least the central region on the top and / or bottom side of the primary metal strip can comprise a stream of liquid argon, liquid helium, and / or one or more other liquid inert gases. The grain size refinement and homogenization process can include directly delivering the first coolant to at least the central region on the top and / or bottom side of the primary metal strip. The grain size refinement and homogenization process may include directly supplying a first coolant to the top and bottom sides of the primary metal strip. The flow rate of the molten alloy mixture supplied to the rotating wheel may be at least 10% greater than the conventional flow rate; rapid solidification includes rotating the rotating wheel at a first wheel speed; the average grain size of the central portion of the final metal strip is at least 5% smaller than the conventional average grain size of the central portion of a conventional metal strip produced by conventional methods; the conventional flow rate is the maximum flow rate in conventional methods for producing conventional metal strips; the conventional method includes supplying the molten alloy mixture to a rotating wheel rotating at a first wheel speed without performing the grain size refinement and homogenization process. The flow rate of the molten alloy mixture supplied to the rotating wheel may be at least 30% greater than the conventional flow rate; the average grain size of the central portion of the final metal strip is at least 10% smaller than the conventional average grain size of the central portion of a conventional metal strip produced by conventional methods. The alloy mixture may contain RE-Fe-Co-MB, where RE is one or more rare earth elements, and where M is one or more elements selected from Ga, Cu, Al, Nb, Zr, W, Ti, Si, C, and Mo.

[0010] In another exemplary embodiment, a method for producing a magnetic material is described. The method includes providing an alloy mixture; melting the alloy mixture to obtain a molten alloy mixture; and rapidly solidifying the molten alloy mixture through a melt spinning process using a rotating wheel to obtain a primary metal strip. The primary metal strip has an elongated, flat body with a bottom side and a top side opposite to the bottom side. The method includes performing a grain size refinement and homogenization process, which includes directly delivering a first coolant to at least the central region of the top and / or bottom side of the primary metal strip to obtain a final metal strip. The average grain size of the central portion of the final metal strip is at least 5% smaller than the average grain size of the central portion of a conventional metal strip produced by conventional methods. Conventional methods involve rapid solidification of the molten alloy mixture using a rotating wheel without performing a grain size refinement and homogenization process.

[0011] The average grain size of the central portion of the final metal strip can be at least 10% smaller than the average grain size of the central portion of a conventional metal strip produced by conventional methods. The first coolant supplied to at least the central region of the top and / or bottom sides of the primary metal strip can comprise a flow of liquid argon, liquid helium, and / or one or more other liquid inert gases. The grain size refinement and homogenization process can include directly supplying the first coolant to at least the central region of the top and / or bottom sides of the primary metal strip. The grain size refinement and homogenization process can include directly supplying the first coolant to the top and bottom sides of the primary metal strip. The flow rate of the molten alloy mixture supplied to the rotating wheel can be at least 10% greater than the conventional flow rate; rapid solidification includes rotating the rotating wheel at a first wheel speed; the conventional flow rate is the maximum flow rate used in conventional methods for producing conventional metal strips. The flow rate of the molten alloy mixture supplied to the rotating wheel can be at least 30% greater than the conventional flow rate. The difference between the average grain size of the central portion of the final metal strip and the average grain size of the edge portion of the final metal strip can be less than 10% or less than 5%. The difference between the average grain size of the central portion of the final metal band and the average grain size of the edge portion of the final metal band can both be less than 10% or less than 5%. The alloy mixture can contain RE-Fe-Co-MB, where RE is one or more rare earth elements, and where M is one or more elements selected from Ga, Cu, Al, Nb, Zr, W, Ti, Si, C, and Mo.

[0012] In one exemplary embodiment, a magnetic material is described. The magnetic material is obtained through one or more of the embodiments described above. The average grain size of the magnetic material at the center portion of the final metal strip is at least 5% smaller than the average grain size of the center portion of a conventional metal strip produced by conventional methods. Conventional methods involve rapidly solidifying a molten alloy mixture using a melt spinning process with a rotating wheel, without grain size refinement and homogenization processes. The average grain size at the center portion of the final metal strip may be at least 10% smaller than the conventional average grain size of the center portion of a conventional metal strip produced using conventional methods. The difference between the average grain size at the center portion of the final metal strip and the average grain size at the edge portion of the final metal strip may be less than 5 nm, preferably less than 2 nm. The difference between the average grain size at the center portion of the final metal strip and the average grain size at the edge portion of the final metal strip may both be less than 5 nm, preferably less than 2 nm. The difference between the average grain size at the center portion of the final metal strip and the average grain size at the edge portion of the final metal strip may be less than 10%, preferably less than 5%. The difference between the average grain size at the center portion of the final metal strip and the average grain size at the edge portion of the final metal strip may both be less than 10%, or preferably less than 5%. The average grain size of the final metal strip's central and / or edge portions can be less than 50 nm, or preferably less than 40 nm. The magnetic material may contain RE-Fe-CO-MB. RE is one or more rare earth elements, and M is one or more elements selected from Ga, Cu, Al, Nb, Zr, W, Ti, Si, C, and Mo.

[0013] In another exemplary embodiment, a system for producing magnetic materials is described. The system may include a crucible for melting an alloy mixture into a molten mixture; a pressure source for applying pressure to eject the molten mixture from the crucible onto a rotating wheel to form a metal strip; and a nozzle for delivering coolant directly to at least the central region of the top and / or bottom sides of the metal strip. The rotating wheel may be configured for a rapid solidification process and the production of the metal strip. The first coolant may comprise a stream of liquid argon, liquid helium, and / or one or more other liquid inert gases. Attached Figure Description

[0014] To gain a more complete understanding of the present invention, exemplary embodiments, and advantages thereof, reference is now made to the following description relating to the accompanying drawings, wherein similar reference numerals denote similar features, and:

[0015] Figure 1 An exemplary embodiment of a system for producing magnetic materials is shown;

[0016] Figure 2A A cross-sectional view of an embodiment of a primary metal strip is shown;

[0017] Figure 2B A cross-sectional view of a final metal strip embodiment is shown;

[0018] Figure 3 An exemplary embodiment of a method for producing magnetic materials is shown;

[0019] Figure 4A The FESEM image of the primary metal strip is shown;

[0020] Figure 4B The FESEM image of the final metal strip is shown;

[0021] Figure 5A A table showing the average grain size of the comparative example and exemplary embodiment 1;

[0022] Figure 5B A graph showing the average grain size of the comparative example and exemplary embodiment 1;

[0023] Figure 5C A table showing the average grain size of each region / area of ​​the primary metal band;

[0024] Figure 5D A graph showing the average grain size of each region / area of ​​the primary metal band;

[0025] Figure 5E A table showing the average grain size of each region / area of ​​the final metal band; and

[0026] Figure 5F A graph showing the average grain size of each zone / region of the final metal band.

[0027] Although similar reference numerals in the figures may be used to refer to similar elements for convenience, it is understood that each of the various exemplary embodiments can be regarded as a different variant.

[0028] Exemplary embodiments will now be described with reference to the accompanying drawings, which are part of the invention and illustrate feasible exemplary embodiments. As used in this invention and the appended claims, the terms “implementation,” “example embodiment,” “exemplary embodiment,” and “this embodiment,” while may, but not necessarily, refer to a single embodiment. Moreover, various exemplary embodiments can be readily combined and / or interchanged without departing from the scope or spirit of the exemplary embodiments. Furthermore, the terminology used in this invention and the appended claims is for describing exemplary embodiments only and is not intended as limiting. In this regard, as used in this invention and the appended claims, the term “in” may include “in” and “on”, while the terms “a,” “an,” and “the” may include singular and plural references. Furthermore, the term “by” as used in this invention and the appended claims may also mean “from,” depending on the context. Additionally, the term “if” as used in this invention and the appended claims may also mean “when” or “upon,” depending on the context. Furthermore, as used in this invention and the appended claims, the term "and / or" may refer to and include any or all possible combinations of one or more of the related listed items. Detailed Implementation

[0029] When producing magnetic materials using conventional melt spinning processes and systems, a metal ribbon is formed by rapidly solidifying (or rapidly quenching) a molten alloy mixture. This metal ribbon has a very fine, nanoscale grain size. Regardless of the process used to form the magnet from the metal ribbon, the fine and uniform grain size throughout the metal ribbon is crucial for the magnetic properties (e.g., remanence and coercivity) of the final magnet produced from it.

[0030] Conventional melt spinning processes and systems typically cannot achieve uniform grain size in metal ribbons, particularly across the ribbon width. More specifically, the central region of the metal ribbon formed using conventional melt spinning processes (e.g., see...) Figure 2A The average grain size of 212b and 211b is larger than that of the metal band sides (and / or edges) (e.g., see...). Figure 2A The average grain size of 212a, 212c, 211a, and 211c in the sample results in a non-uniform grain size in the metal strip. In this invention, it is recognized that this variation in average grain size is a direct result of the central region receiving less cooling than the sides (and / or edges) during rapid curing.

[0031] Exemplary embodiments of the present invention generally relate to and / or include methods, systems, approaches, and products for solving industrial problems, including those described above and in this invention. More specifically, exemplary embodiments relate to methods, systems, methods for producing magnetic materials, and the magnetic materials obtained. As further described in this invention, exemplary embodiments offer various technical advantages and / or improvements compared to conventional methods.

[0032] It should be understood that while the exemplary embodiments described in this invention are mostly related to the use of liquid inert gases as coolants, the principles described in this invention can also be applied beyond the scope of liquid inert gases, for example, using gaseous, liquid, or gaseous inert gases, without departing from the teachings of this invention.

[0033] Exemplary embodiments are now described below with reference to the accompanying drawings, which form part of this invention.

[0034] An exemplary implementation of a system (e.g., system 100) for producing magnetic materials.

[0035] Figure 1 An exemplary embodiment of a system (e.g., system 100) for producing magnetic materials is shown. System 100 for producing magnetic materials includes a rotating wheel assembly 120, such as a melt spinning system with rotating wheels. System 100 also includes a crucible assembly 110 for receiving and melting an alloy mixture and providing the molten alloy mixture 200 (or molten metal alloy 200) to the rotating wheel surface 122 of the rotating wheel assembly 120. System 100 also includes a grain size refinement and homogenization assembly 130 for controlling grain size refinement and uniformity across the width of a metal strip produced by rapidly solidifying the molten alloy mixture via the rotating wheels of the rotating wheel assembly 120. System 100 also includes a chamber (not shown) or the like for housing the crucible assembly 110, the rotating wheel assembly 120, and the grain size refinement and homogenization assembly 130, and for maintaining consistent environmental / conditions for producing magnetic materials. For example, during the production of magnetic materials, the internal pressure and temperature of the chamber can be maintained between approximately 200 mTorr and 805 Torr, and between approximately 10°C and 200°C, respectively. Furthermore, the chamber can receive and maintain an atmosphere of one or more inert gases (e.g., argon, helium, or similar gases) through one or more inlet valves and / or outlet valves. In this regard, during the production of magnetic materials, the chamber also dynamically maintains the aforementioned environment / conditions in consideration of the application / delivery of coolant 130a by the grain size refinement and homogenization component 130 (as described in this invention).

[0036] Exemplary embodiments and elements thereof of a system 100 for producing magnetic materials will now be further described with reference to the accompanying drawings, which form part of this invention.

[0037] Crucible assembly (e.g., crucible assembly 110)

[0038] like Figure 1 As shown, an exemplary embodiment of the system 100 for producing magnetic materials includes a crucible assembly (e.g., crucible assembly 110) for receiving and melting an alloy mixture and supplying the molten alloy mixture to a rotating wheel assembly 120.

[0039] The crucible assembly 110 includes a crucible (e.g., crucible 112) or the like. The crucible 112 may be formed as a body 112 with an internal cavity for receiving and containing alloy mixtures. For example, the crucible 112 may be formed as a cylinder with a circular cross-section.

[0040] The crucible assembly 110 also includes a heating coil (e.g., heating coil 114) or the like, disposed within and / or on the crucible 112 in a manner that provides heating to the internal cavity of the crucible 112. In an exemplary embodiment, the heating coil 114 may be an induction heating coil 114 or the like, configured to provide sufficient heat to melt the alloy mixture (i.e., to achieve a molten state) when the alloy mixture is disposed within the internal cavity of the crucible 112.

[0041] To enable the crucible assembly 110 to eject molten alloy mixture 200 from the internal cavity of the crucible 112 into the rotating wheel assembly 120, the crucible assembly 110 includes a nozzle (e.g., nozzle 116) or the like disposed at one end of the crucible 112. In an exemplary embodiment, the molten alloy mixture 200 in the crucible 112 may be selectively pressurized to eject the molten alloy mixture 200 from the nozzle 116 at a flow rate of about 0.2 kg / min to 5.0 kg / min. It should be understood in this invention that the pressure applied to the molten alloy mixture 200 in the crucible 112 for ejecting the molten alloy mixture 200 from the nozzle 116 can be provided by any method and / or device, including but not limited to positive pressure sources, gravity (e.g., applying pressure to the downstream molten alloy mixture 200 near the nozzle 116 by gravity, i.e., by the weight of the upstream molten alloy mixture 200 flowing towards the nozzle 116), etc.

[0042] In an exemplary embodiment, the alloy mixture ejected as molten alloy mixture 200 by the nozzle 116 of the crucible assembly 110 may include, but is not limited to, a composition represented by RE-Fe-B, wherein RE is one or more rare earth elements; Fe is iron; and B is boron. In a preferred embodiment, the composition of the alloy mixture is RE-Fe-Co-MB, wherein RE is one or more rare earth elements; Fe is iron; Co is cobalt; M is one or more elements selected from Ga, Cu, Al, Nb, Zr, W, Ti, Si, C, and Mo; and B is boron.

[0043] Rotating wheel assembly (e.g., rotating wheel assembly 120)

[0044] like Figure 1 As shown, an exemplary embodiment of a system 100 for producing magnetic materials includes a rotating wheel assembly (e.g., rotating wheel assembly 120). The rotating wheel assembly 120 includes a rotating wheel 120 or the like having an outer contact surface (e.g., contact surface 122) configured to rapidly solidify (or rapidly quench) the molten alloy mixture 200 ejected from the nozzle 116 of the crucible assembly 110. The rotating wheel 120 of the rotating wheel assembly 120 is configured to rotate relative to the central axis C of the rotating wheel 120 (e.g., as shown). Figure 1 As indicated by the directional arrow R in the diagram, its rotational speed (or wheel speed) is between approximately 5 m / s and 60 m / s. Among other things, the rotational speed of the rotating wheel 120 can be selected based on the flow rate of the molten alloy mixture 200 from the nozzle 116, the opening size of the nozzle 116, the amount of positive pressure applied to the molten alloy mixture 200 in the internal cavity of the crucible 112, the composition and temperature of the alloy mixture supplied to the internal cavity of the crucible 112, and / or the required dimensions / specifications (e.g., width, thickness, etc.) of the primary metal strip 210 formed by the rotating wheel assembly 120.

[0045] As used in this invention, the metal strip 210 formed by the rapidly solidified molten alloy mixture 200 from the contact surface 122 of the rotating wheel assembly 120 prior to processing by the grain size refinement and homogenization component 120 (as described in this invention) is referred to as the “primary metal strip” 210.

[0046] Grain size refinement and homogenization components (e.g., grain size refinement and homogenization component 130)

[0047] In one exemplary embodiment, a system 100 for producing magnetic materials includes a grain size refinement and homogenization assembly (e.g., grain size refinement and homogenization assembly 130). The grain size refinement and homogenization assembly 130 may include any components and / or elements configured or configured to deliver an exemplary embodiment of coolant (e.g., coolant 130a) from a coolant source (not shown) to one or more portions of a primary metal strip 210 (formed by rapid solidification of a molten alloy mixture 200 as described above and in this invention). As used in this invention, a metal strip 210 formed by rapid solidification of the molten alloy mixture 200 that has not (or has not yet) received coolant 130a from the grain size refinement and homogenization assembly 130 is referred to as the primary metal strip 210. Furthermore, as used in this invention, a primary metal strip 210 that has received coolant 130a from the grain size refinement and homogenization assembly 130 (i.e., has been processed by the grain size refinement and homogenization assembly 130) is referred to as the “final metal strip” 220. In other words, after the primary metal strip 210 receives coolant 130a from the grain size refinement and homogenization component 130, the primary metal strip 210 becomes the final metal strip 220. It should be understood in this invention that the metal strip formed by the rapid solidification of the molten alloy mixture 200 can be a long metal strip, partly the primary metal strip 210 and partly the final metal strip 220. For example, Figure 1 The metal strip shown has: a portion 210a that contacts the outer contact surface 122 of the rotating wheel 120 (this portion of the metal strip is considered the primary metal strip 210), a portion 210b that has left the rotating wheel 120 and has not yet received the coolant 130a (this portion of the metal strip is also considered the primary metal strip 210), and a portion that has received the coolant 130a (this portion of the metal strip is referred to as the final metal strip 220).

[0048] Figure 2AA cross-sectional view of an example of a primary metal strip 210 is shown. The primary metal strip 210 includes a top surface 212 (or top side 212) and a bottom surface 211 (or bottom side 211), wherein the bottom surface 211 is the surface or side of the primary metal strip 210 that is in direct contact with the outer contact surface 122 of the rotating wheel 120 (or still in contact with the outer contact surface 122 of the rotating wheel 120 if the primary metal strip 210 has not yet left the rotating wheel 120). The top surface 212 of the primary metal strip 210 includes a left top surface 212a (or left top side 212a), a middle top surface 212b (or middle top side 212b), and a right top surface 212c (or right top side 212c). The bottom surface 211 of the primary metal strip 210 includes a left bottom surface 211a (or left bottom side 211a), a middle bottom surface 211b (or middle bottom side 211b), and a right bottom surface 211c (or right bottom side 211c). The primary metal strip 210 leaves the contact surface 122 of the rotating wheel assembly 120 and is further processed by the grain size refinement and homogenization assembly 130.

[0049] Figure 2B A cross-sectional view of an exemplary embodiment of the final metal strip 220 is shown, the metal strip 220 having a top surface 222 (or top side 222) and a bottom surface 221 (or bottom side 221), wherein the bottom surface 221 is the surface or side of the final metal strip 220 that is in direct contact with the outer contact surface 122 of the rotating wheel 120 (or, if it has not yet left the rotating wheel 120, is still in contact with the outer contact surface 122 of the rotating wheel 120 and has received coolant 130a). The top surface 222 of the final metal strip 220 includes a left top surface 222a (or left top side 222a), a middle top surface 222b (or middle top side 222b), and a right top surface 222c (or right top side 222c). The bottom surface 221 of the final metal strip 220 includes a left bottom surface 221a (or left bottom side 221a), a middle bottom surface 221b (or middle bottom side 221b) and a right bottom surface 221c (or right bottom side 221c).

[0050] The grain size refinement and homogenization component 130 may include one or more nozzles (e.g., nozzle 132) or the like communicating with a coolant source (not shown). In an exemplary embodiment, one or more nozzles 132 are configured to deliver coolant 130a to the primary metal strip 210. As a more specific example, the grain size refinement and homogenization component 130 may include one or more nozzles 132 or the like configured such that one or more flows of coolant 130a are delivered to at least a portion of the top surface 212 of the primary metal strip 210. The one or more nozzles 132 may be configured such that coolant 130a is uniformly distributed to the left top side or left top surface 212a of the primary metal strip 210 (e.g., ...). Figure 2A As shown), the right top side or right top surface 212c (as shown) Figure 2A(as shown) and the top side or top surface 212b (as shown) Figure 2A At least a portion of the primary metal strip 210 (as shown) is used to obtain the final metal strip 220. In an exemplary embodiment, the width of the primary metal strip 210 (i.e., the dimension between the leftmost portion / edge of the left top side 212a and the rightmost portion / edge of the right top side 212c) is small (e.g., less than about 3 mm), and the grain size refinement and homogenization component 130 may be configured to have a single nozzle 132 for delivering a single flow of coolant 130a to the top surface 212 of the primary metal strip 210. One or more nozzles 132 may be fixedly positioned to deliver coolant 130a to at least a portion 210b of the primary metal strip 210 (as shown) to obtain the final metal strip 220. Figure 1 As shown), portion 210b has left (or is no longer in contact with) the contact surface 122 of the rotating wheel 120. One or more nozzles 132 may be fixedly positioned less than 50 mm from the top surface 212 of the primary metal strip 210, at which point the primary metal strip 210 is approximately 5 mm to 600 mm from the contact surface 122 of the rotating wheel 120. Alternatively or additionally, one or more nozzles 132 may be fixedly positioned to deliver coolant 130a to at least a portion 210a of the primary metal strip 210, which has not yet left (or is still in contact with) the contact surface 122 of the rotating wheel 120. One or more such nozzles 132 may be fixedly positioned less than 50 mm from the top surface 212 of the primary metal strip 210.

[0051] Alternatively, or in addition to one or more nozzles 132 configured to deliver coolant 130a to at least a portion of the top surface 212 of the primary metal strip 210, the grain size refinement and homogenization assembly 130 may include one or more nozzles 132 or the like configured to deliver one or more streams of coolant 130a to at least a portion of the bottom surface 211 of the primary metal strip 210. The bottom surface 211 of the primary metal strip 210 is the surface or side opposite to the top surface 212 of the primary metal strip 210. One or more such nozzles 132 may be configured to distribute coolant 130a at least uniformly to the left bottom side or left bottom surface 211a of the primary metal strip 210 (e.g., Figure 2A (as shown), right bottom side or right bottom surface 211c (as shown) Figure 2A (as shown) and midsole side or midsole surface 211b (as shown) Figure 2A(As shown). In an exemplary embodiment, the width of the primary metal strip 210 (i.e., the dimension between the leftmost portion / edge of the left bottom side or left bottom surface 211a and the rightmost portion / edge of the right bottom side or right bottom surface 211c) is small (e.g., less than about 3 mm), and the grain size refinement and homogenization component 130 may be configured to have a single nozzle 132 to deliver a single flow of coolant 130a to the bottom surface 211 of the primary metal strip 210. One or more nozzles 132 may be fixedly positioned to deliver coolant 130a to at least a portion of the primary metal strip 210 (e.g., as shown). Figure 1 As shown in the diagram, this part has left (or is no longer in contact with) the contact surface 122 of the rotating wheel 120. One or more such nozzles 132 can be fixedly positioned at a distance of less than 50 mm from the bottom surface 211 of the primary metal strip 210, and at this time the primary metal strip 210 is between approximately 5 mm and 600 mm from the contact surface 122 of the rotating wheel 120.

[0052] In an exemplary embodiment, the coolant 130a supplied to the primary metal strip 210 by the grain size refinement and homogenization component 130 may be in the form of a flow of liquid argon 130a, liquid helium 130a, and / or one or more other inert gases 130a in liquid form (or liquid state). In this respect, the primary metal strip 210 receives and contacts the flow of liquid argon 130a, liquid helium 130a, and / or one or more other inert gases 130a in liquid / liquid form (i.e., receives and contacts one or more inert gases 130a in liquid / liquid form, such as liquid argon 130a). This flow of one or more inert gases 130a in liquid / liquid form may be supplied at a flow rate of approximately 20-500 cc / min. Alternatively, or in addition to supplying a flow of one or more inert gases in liquid / liquid form, the coolant 130a supplied to the primary metal strip 210 by the grain size refinement and homogenization component 130 may be a flow or stream of argon, helium, and / or one or more other inert gases in gaseous / gaseous form.

[0053] The present invention recognizes that, in the process of delivering an exemplary embodiment of coolant 130a to a primary metal strip 210 via an exemplary embodiment of the grain size refinement and homogenization component 130 (compared to processing the primary metal strip 210 without the grain size refinement and homogenization component 130 (including not delivering coolant 130a)), the resulting final metal strip 220 exhibits more uniform grain size refinement and homogenization across the width of its top side 222 and / or bottom side 221 (i.e., better or higher grain size uniformity for the left top side 222a, right top side 222c, middle top side 222b, left bottom side 221a, right bottom side 222c, and middle bottom side 222b). In the present invention, better or higher grain size uniformity refers to smaller deviations, ranges, or differences in grain size. For example, compared to the final metal strip 220 with an average grain size of 38.1 nm for the left side 221a / 222a, 39.1 nm for the center 221b / 222b, and 37.7 nm for the right side 221c / 222c, the primary metal strip 210 with an average grain size of 43.5 nm for the left side 211a / 212a, 46.9 nm for the center 211b / 212b, and 39.1 nm for the right side 211c / 212c exhibits poorer grain size uniformity (or poorer grain size uniformity across the width) than the final metal strip 220 with an average grain size of 38.1 nm for the left side 221a / 222a, 39.1 nm for the center 221b / 222b, and 37.7 nm for the right side 221c / 222c.

[0054] More specifically, the present invention recognizes that, in the process of delivering an exemplary embodiment of coolant 130a to a primary metal strip 210 via an exemplary embodiment of the grain size refinement and homogenization component 120 (compared to processing the primary metal strip 210 without the grain size refinement and homogenization component 130 (including not delivering coolant 130a)), the resulting final metal strip 220 is such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of one or more side or edge portions (221a, 221c, 222a and / or 222c) of the final metal strip 220 is less than 10% of the average grain size of the side or edge portions (221a, 221c, 222a and / or 222c) of the final metal strip 220. Preferably, the final metal strip 220 is formed such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220 (i.e., compared with each side or edge portion of the final metal strip 220) is less than 10% of the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220. Preferably, the final metal strip 220 is formed such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of one or more side or edge portions (221a, 221c, 222a and / or 222c) of the final metal strip 220 is less than 5% of the average grain size of the side or edge portions (221a, 221c, 222a and / or 222c) of the final metal strip 220. Preferably, the final metal strip 220 is formed such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220 (i.e., compared with each side or edge portion of the final metal strip 220) is less than 5% of the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220.

[0055] Alternatively or additionally, when an exemplary embodiment of coolant 130a is delivered to the primary metal strip 210 via an exemplary embodiment of grain size refinement and homogenization component 130 (compared to not processing the primary metal strip 210 with grain size refinement and homogenization component 130 (including not delivering coolant 130a)), the resulting final metal strip 220 results in a difference of less than 5 nm between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of the side or edge portions (221a, 221c, 222a and / or 222c) of the final metal strip 220. Preferably, the final metal strip 220 is formed such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of each side or edge portion (221a, 221c, 222a, and 222c) of the final metal strip 220 (i.e., compared to each side or edge portion of the final metal strip 220) is less than 5 nm. Preferably, the final metal strip 220 is formed such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of the side or edge portions (221a, 221c, 222a, and / or 222c) of the final metal strip 220 is less than 2 nm. Preferably, the final metal strip 220 is formed such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220 is less than 2 nm.

[0056] Alternatively or additionally, when an exemplary embodiment of coolant 130a is delivered to the primary metal strip 210 via an exemplary embodiment of the grain size refinement and homogenization component 130 (compared to not processing the primary metal strip 210 with the grain size refinement and homogenization component 130 (including not delivering coolant 130a)), the resulting final metal strip 220 has an average grain size of 50 nm or less in the central portion 221b / 222b of the final metal strip 220. Preferably, the resulting final metal strip 220 has an average grain size of 40 nm or less in the central portion 221b / 222b of the final metal strip 220. Preferably, the resulting final metal strip 220 has an average grain size of 50 nm or less in the central portion 221b / 222b of the final metal strip 220 and an average grain size of 50 nm or less in each side or edge portion (221a, 221c, 222a, and 222c) of the final metal strip 220. Preferably, the final metal strip 220 is formed such that the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220 are less than 40 nm.

[0057] The present invention also recognizes that, in an exemplary embodiment of the process of supplying coolant 130a to the primary metal strip 210 via the exemplary embodiment of the grain size refinement and homogenization component 130 (compared to processing the primary metal strip 210 without the grain size refinement and homogenization component 130 (including not supplying coolant 130a)), the average grain size of the central portions 221b / 222b of the formed final metal strip 220 is smaller than the conventional average grain size of the central portions of conventional metal strips produced by conventional methods. For example, the average grain size of the central portions 221b / 222b of the formed final metal strip 220 is at least 5% smaller than the conventional average grain size of the central portions of conventional metal strips produced using conventional methods. Preferably, the average grain size of the central portions 221b / 222b of the formed final metal strip 220 is at least 10% smaller than the conventional average grain size of the central portions of conventional metal strips produced using conventional methods. As mentioned in this invention, "conventional method" or similar method can be any method of producing metal strip, which does not include processing the primary metal strip 210 using the exemplary embodiment of the grain size refinement and homogenization component 130 (i.e., the exemplary embodiment of the conventional method that does not deliver coolant 130a to the primary metal strip 210). Furthermore, as mentioned in this invention, "conventional metal strip" or the like can be any metal strip (including the primary metal strip 210) produced without processing the primary metal strip 210 using the exemplary embodiment of the grain size refinement and homogenization component 130 (i.e., the conventional metal strip that has not been processed by the exemplary embodiment of coolant 130a). Furthermore, as mentioned in this invention, "central portion of conventional metal strip" or the like can be the central portion of any metal strip (including the central portion of the primary metal strip 210) produced without processing the primary metal strip 210 using the exemplary embodiment of the grain size refinement and homogenization component 130 (i.e., the central portion of the conventional metal strip that has not been processed with the exemplary embodiment of coolant 130a).

[0058] The present invention also recognizes that, in an exemplary embodiment of supplying coolant 130a to the primary metal strip 210 via an exemplary embodiment of the grain size refinement and homogenization component 130 (compared to processing the primary metal strip 210 without the grain size refinement and homogenization component 130 (including without supplying coolant 130a)), the flow rate of the molten alloy mixture 200 provided to the outer contact surface 122 of the rotating wheel 120 (rotating at a first rotational speed or a first wheel speed) can be increased by at least 10% compared to the conventional flow rate of the molten alloy mixture 200 used in conventional methods. As mentioned in the present invention, the “conventional flow rate” of the molten alloy mixture 200 refers to the maximum flow rate of the molten alloy mixture 200 provided to the outer contact surface 122 of the rotating wheel 120 (rotating at a first rotational speed or a first wheel speed) using conventional methods (as described in the present invention, excluding methods for processing the primary metal strip 210 using an exemplary embodiment of the grain size refinement and homogenization component 130 (i.e., an exemplary embodiment of conventional methods without supplying coolant 130a to the primary metal strip 210)). Preferably, the average grain size of the central portion of the final metal strip 220 produced by the molten alloy mixture 200 with a flow rate increased by 10% (compared to the conventional flow rate) is at least 5% smaller than the conventional average grain size of the central portion of a conventional metal strip produced using the conventional method (and the conventional flow rate). Preferably, the average grain size of the central portion of the final metal strip 220 produced by the molten alloy mixture 200 with a flow rate increased by 10% (compared to the conventional flow rate) is at least 10% smaller than the conventional average grain size of the central portion of a conventional metal strip produced using the conventional method (and the conventional flow rate). Preferably, the flow rate of the molten alloy mixture 200 supplied to the outer contact surface 122 of the rotating wheel 120 (rotating at a first rotational speed or a first wheel speed) can be increased by at least 30% compared to the conventional flow rate of the molten alloy mixture 200 used in the conventional method. Preferably, the average grain size of the central portion of the final metal strip 220 produced from the molten alloy mixture 200 with a flow rate increased by 30% (compared to the conventional flow rate) is at least 5% smaller than the conventional average grain size of the central portion of a conventional metal strip produced using the conventional method (and the conventional flow rate). Preferably, the average grain size of the central portion of the final metal strip 220 produced from the molten alloy mixture 200 with a flow rate increased by 30% (compared to the conventional flow rate) is at least 10% smaller than the conventional average grain size of the central portion of a conventional metal strip produced using the conventional method (and the conventional flow rate).

[0059] An exemplary embodiment of a method for producing magnetic materials (e.g., method 300).

[0060] Figure 3An exemplary embodiment of a method for producing magnetic materials (e.g., method 300) is shown. Method 300 for producing magnetic materials includes providing an alloy mixture (e.g., action 302). Method 300 further includes melting the alloy mixture to obtain a molten alloy mixture (e.g., action 304). Method 300 further includes performing a melt spinning process (e.g., action 306). The melt spinning process includes rapidly solidifying the molten alloy mixture (as obtained in action 304) by rotating a wheel to obtain a primary metal strip (e.g., action 306). Method 300 further includes performing a grain size refinement and homogenization process (e.g., action 308).

[0061] In an exemplary embodiment, method 300 may use an exemplary embodiment of system 100 (as described in this invention) or one or more elements of system 100 (including crucible assembly 110, rotating wheel assembly 120, and / or grain size refinement and homogenization assembly 130) to perform grain sizing. Such system 100 or one or more elements of system 100 may be housed within a chamber (not shown) or the like, configured to maintain a consistent environment / conditions for the production of magnetic materials. For example, while producing magnetic materials, method 300 may also include maintaining the internal pressure and / or temperature of the chamber between about 10 torr and about 10°C and 200°C, respectively. Furthermore, method 300 may also include providing and maintaining an atmosphere of one or more inert gases (e.g., argon, helium, or similar gases) within the chamber, for example, through one or more inlet valves and / or outlet valves (not shown). Method 300 may also include dynamically maintaining the aforementioned environment / conditions in the chamber during the production of magnetic materials, taking into account the application / delivery of coolant 130a grain size (e.g., by grain size refinement and homogenization component 130 as described in the present invention) and the atmosphere of one or more inert gases.

[0062] An exemplary embodiment of a method 300 for producing magnetic materials and its operation will now be further described with reference to the accompanying drawings, which form part of this invention.

[0063] Provide alloy mixtures (e.g., Action 302).

[0064] In one exemplary embodiment, method 300 for producing magnetic materials includes providing an alloy mixture (e.g., action 302). The alloy mixture may include, but is not limited to, a composition represented by RE-Fe-B, where RE is one or more rare earth elements; Fe is iron; and B is boron. In a preferred embodiment, the alloy mixture is composed of RE-Fe-Co-MB, where RE is one or more rare earth elements; Fe is iron; Co is cobalt; M is one or more elements selected from Ga, Cu, Al, Nb, Zr, W, Ti, Si, C, and Mo; and B is boron. The alloy mixture may be provided in an exemplary embodiment of crucible assembly 110. The alloy mixture may be provided in the form of raw materials (including RE, Fe, Co, M, and / or B) and / or in the form of pre-melted ingots (which may include RE, Fe, Co, M, and / or B).

[0065] Melting an alloy mixture to obtain a molten alloy mixture (e.g., action 304).

[0066] In one exemplary embodiment, method 300 for producing magnetic materials includes melting an alloy mixture to obtain a molten alloy mixture (e.g., action 304). Exemplary embodiments may use a crucible assembly 110 or the like with a heating coil 114 to melt the alloy mixture. The heating coil 114 may be an induction heating coil 114 or the like, configured to provide sufficient heat to melt the alloy mixture (i.e., to achieve a molten state) when the alloy mixture is placed in the internal cavity of the crucible 112.

[0067] Perform the melt spinning process (e.g., action 306).

[0068] In one exemplary embodiment, method 300 for producing magnetic materials includes performing a melt spinning process (e.g., action 306). The melt spinning process includes rapidly solidifying a molten alloy mixture (as obtained in action 304 and placed in crucible 116) using a rotating wheel to obtain a primary metal strip (e.g., action 306). Method 300 includes spraying the molten alloy mixture from crucible 112 onto the outer contact surface 122 of rotating wheel 120 through nozzle 116 or the like.

[0069] The molten alloy mixture can be ejected at a flow rate of approximately 0.2 kg / min to 5.0 kg / min.

[0070] The melt spinning process includes a spinneret assembly 120 with respect to its central axis C (e.g., as shown in the image). Figure 1The rotating wheel 120 rotates at a speed of approximately 5 m / s to 60 m / s (as indicated by the directional arrow R in the diagram). Among other things, the rotational speed of the rotating wheel 120 can be selected based on the flow rate of the molten alloy mixture from the nozzle 116, the opening size of the nozzle 116, the amount of positive pressure applied to the internal cavity of the crucible 112, the composition and temperature of the alloy mixture supplied to the internal cavity of the crucible 112, and the required dimensions / specifications (e.g., width, thickness, etc.) of the primary metal strip 210 formed by the rotating wheel assembly 120.

[0071] When the molten alloy mixture ejected from nozzle 116 comes into contact with the outer contact surface 122 of rotating wheel 120, the molten alloy mixture rapidly solidifies, producing a primary metal strip (as described in this invention).

[0072] Perform grain size refinement and homogenization processes (e.g., action 308).

[0073] In one exemplary embodiment, a method 300 for producing magnetic materials includes performing a grain size refinement and homogenization process (e.g., action 308). The grain size refinement and homogenization process may be performed by an exemplary embodiment of a grain size refinement and homogenization assembly 130. The grain size refinement and homogenization process includes, in an exemplary embodiment, delivering coolant 130a from a coolant source (not shown) to one or more portions of a primary metal strip 210 (e.g., formed by rapid solidification of a molten alloy mixture (as described above and in this invention)) to obtain a final metal strip. The coolant 130a delivered to the primary metal strip 210 by the grain size refinement and homogenization process may be in the form of a stream of liquid argon 130a, liquid helium 130a, and / or one or more other inert gases 130a in liquid form (or liquid state). In this respect, the primary metal strip 210 receives and contacts a flow of liquid argon 130a, liquid helium 130a, and / or one or more other inert gases 130a in liquid / liquid form (i.e., receives and contacts a liquid / liquid form of one or more inert gases 130a, such as liquid argon 130a). This flow of one or more inert gases 130a in liquid / liquid form can be delivered at a flow rate of approximately 20-500 cc / min. Alternatively, or in addition to delivering a flow of one or more inert gases 130a in liquid / liquid form, the coolant 130a delivered to the primary metal strip 210 by the grain size refinement and homogenization process can be a flow or stream of argon, helium, and / or one or more other inert gases in gaseous / gaseous form.

[0074] In an exemplary embodiment, the grain size refinement and homogenization process includes delivering coolant 130a to the primary metal strip 210 through one or more nozzles 132 of the grain size refinement and homogenization assembly 130. The one or more nozzles 132 are configured such that one or more flows of coolant 130a are delivered to at least a portion of the top side 212 of the primary metal strip 210. The one or more nozzles 132 may be configured such that coolant 130a is uniformly distributed to the left top side or left top surface 212a of the primary metal strip 210 (e.g., ...). Figure 2A As shown), the right top side or right top surface 212c (as shown) Figure 2A (as shown) and the top side or top surface 212b (as shown) Figure 2A At least a portion of the primary metal strip 210 (as shown) is used to obtain the final metal strip 220. In an exemplary embodiment, the width of the primary metal strip 210 (i.e., the dimension between the leftmost portion / edge of the left top side 212a and the rightmost portion / edge of the right top side 212c) is small (e.g., less than about 3 mm), and the grain size refinement and homogenization process can utilize a single nozzle 132 to deliver a single flow of coolant 130a to the top surface 212 of the primary metal strip 210.

[0075] In an exemplary embodiment, the grain size refinement and homogenization process may deliver coolant 130a to at least a portion 210b of the primary metal strip 210 that has moved away from (or no longer contacts) the contact surface 122 of the rotating wheel 120 (e.g., ...). Figure 1 (as shown in the diagram). In such an example, one or more nozzles 132 may be fixedly positioned at a distance of less than 50 mm from the top surface 212 of the primary metal strip 210, and at this time the primary metal strip 210 is between approximately 5 mm and 600 mm from the contact surface 122 of the rotating wheel 120.

[0076] Alternatively or additionally, the grain size refinement and homogenization process may deliver coolant 130a to at least a portion 210a of the primary metal strip 210 that has not yet left (or is still in contact with) the contact surface 122 of the rotating wheel 120. In such an example, one or more nozzles 132 may be fixedly positioned at a distance of less than 50 mm from the top surface 212 of the primary metal strip 210.

[0077] Alternatively, or in addition to one or more nozzles 132 configured to deliver coolant 130a to at least a portion of the top surface 212 of the primary metal strip 210, a grain size refinement and homogenization process may deliver one or more streams of coolant 130a to at least a portion of the bottom surface 211 of the primary metal strip 210. In such an example, one or more nozzles 132 may be configured to distribute coolant 130a at least uniformly to the left bottom side or left bottom surface 211a of the primary metal strip 210 (e.g., Figure 2A(as shown), right bottom side or right bottom surface 211c (as shown) Figure 2A As shown), and the midsole side or midsole surface 211b (as shown). Figure 2A (As shown). In an exemplary embodiment, the width of the primary metal strip 210 (i.e., the dimension between the leftmost portion / edge of the left bottom side or left bottom surface 211a and the rightmost portion / edge of the right bottom side or right bottom surface 211c) is small (e.g., less than about 3 mm), and the grain size refinement and homogenization component 130 may be configured to have a single nozzle 132 to deliver a single flow of coolant 130a to the bottom surface 211 of the primary metal strip 210.

[0078] In an exemplary embodiment, the grain size refinement and homogenization process can deliver coolant 130a to at least a portion of the primary metal strip 210 (e.g., Figure 1 As shown in the diagram, this part has moved away from (or is no longer in contact with) the contact surface 122 of the rotating wheel 120. In such an example, one or more nozzles 132 may be fixedly positioned less than 50 mm from the bottom surface 211 of the primary metal strip 210, and at this time the primary metal strip 210 is between approximately 5 mm and 600 mm from the contact surface 122 of the rotating wheel 120.

[0079] The present invention recognizes that, in the process of delivering coolant 130a to primary metal strip 210 through an exemplary embodiment of a grain size refinement and homogenization process (compared to conventional methods that do not process primary metal strip 210 with a grain size refinement and homogenization process (including not delivering coolant 130a), the resulting final metal strip 220 has more (or better or greater) grain size refinement and homogenization on the width of the top side 222 and / or bottom side 221 of the final metal strip 220 (i.e., higher or increased uniformity of grain size on the left top side 222a, right top side 222c, middle top side 222b, left bottom side 221a, right bottom side 222c and middle bottom side 222b).

[0080] More specifically, the present invention recognizes that, in the process of delivering coolant 130a to primary metal strip 210 through an exemplary embodiment of a grain size refinement and homogenization process (compared to conventional methods that do not process primary metal strip 210 with a grain size refinement and homogenization process (including not delivering coolant 130a)), the resulting final metal strip 220 is such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of one or more side or edge portions (221a, 221c, 222a and / or 222c) of the final metal strip 220 is less than 10% of the average grain size of the side or edge portions (221a, 221c, 222a and / or 222c) of the final metal strip 220. Preferably, the final metal strip 220 is formed such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220 (i.e., compared with each side or edge portion of the final metal strip 220) is less than 10% of the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220. Preferably, the final metal strip 220 is formed such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of one or more side or edge portions (221a, 221c, 222a and / or 222c) of the final metal strip 220 is less than 5% of the average grain size of the side or edge portions (221a, 221c, 222a and / or 222c) of the final metal strip 220. Preferably, the final metal strip 220 is formed such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220 (i.e., compared with each side or edge portion of the final metal strip 220) is less than 5% of the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220.

[0081] Alternatively or additionally, when an exemplary embodiment of coolant 130a is delivered to the primary metal strip 210 via an exemplary embodiment of a grain size refinement and homogenization process (compared to conventional methods that do not process the primary metal strip 210 with a grain size refinement and homogenization process, including not delivering coolant 130a), the resulting final metal strip 220 forms such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of the side or edge portions (221a, 221c, 222a and / or 222c) of the final metal strip 220 is less than 5 nm. Preferably, the resulting final metal strip 220 forms such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220 (i.e., compared to each side or edge portion of the final metal strip 220) is less than 5 nm. Preferably, the final metal strip 220 is formed such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of the side or edge portions (221a, 221c, 222a and / or 222c) of the final metal strip 220 is less than 2 nm. Preferably, the final metal strip 220 is formed such that the difference between the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220 is less than 2 nm.

[0082] Alternatively or additionally, when an exemplary embodiment of coolant 130a is delivered to the primary metal strip 210 via an exemplary embodiment of a grain size refinement and homogenization process (compared to conventional methods that do not process the primary metal strip 210 with a grain size refinement and homogenization process (including not delivering coolant 130a)), the resulting final metal strip 220 has an average grain size of 50 nm or less in the central portion 221b / 222b of the final metal strip 220. Preferably, the resulting final metal strip 220 has an average grain size of 50 nm or less in the central portion 221b / 222b of the final metal strip 220 and an average grain size of 50 nm or less in each side or edge portion (221a, 221c, 222a, and 222c). Preferably, the final metal strip 220 is formed such that the average grain size of the central portion 221b / 222b of the final metal strip 220 and the average grain size of each side or edge portion (221a, 221c, 222a and 222c) of the final metal strip 220 are less than 40 nm.

[0083] The present invention also recognizes that, in the exemplary embodiment of delivering coolant 130a to the primary metal strip 210 through a grain size refinement and homogenization process (compared to conventional methods that do not process the primary metal strip 210 through a grain size refinement and homogenization process, including not delivering coolant 130a), the average grain size of the central portions 221b / 222b of the resulting final metal strip 220 is smaller than the conventional average grain size of the central portions of conventional metal strips produced by conventional methods. For example, the average grain size of the central portions 221b / 222b of the resulting final metal strip 220 is at least 5% smaller than the conventional average grain size of the central portions of conventional metal strips produced using conventional methods. Preferably, the average grain size of the central portions 221b / 222b of the resulting final metal strip 220 is at least 10% smaller than the conventional average grain size of the central portions of conventional metal strips produced using conventional methods.

[0084] The present invention also recognizes that, in the exemplary embodiment of delivering coolant 130a to the primary metal strip 210 through a grain size refinement and homogenization process (compared to conventional methods that do not process the primary metal strip 210 through a grain size refinement and homogenization process, including not delivering coolant 130a), the flow rate of the molten alloy mixture 200 supplied to the outer contact surface 122 of the rotating wheel 120 (rotating at a first rotational speed or a first wheel speed) can be increased by at least 10% compared to the conventional flow rate of the molten alloy mixture 200 used in conventional methods. Preferably, the average grain size of the central portion of the final metal strip 220 produced by the molten alloy mixture 200 with the aforementioned 10% increase in flow rate (compared to the conventional flow rate) is at least 5% smaller than the conventional average grain size of the central portion of a conventional metal strip produced using the aforementioned conventional methods (and the aforementioned conventional flow rates). Preferably, the average grain size of the central portion of the final metal strip 220 produced by the molten alloy mixture 200 with a flow rate increased by 10% (compared to the conventional flow rate) is at least 10% smaller than the conventional average grain size of the central portion of a conventional metal strip produced using the conventional method (and the conventional flow rate). Preferably, the flow rate of the molten alloy mixture 200 supplied to the outer contact surface 122 of the rotating wheel 120 (rotating at a first rotational speed or a first wheel speed) can be increased by at least 30% compared to the conventional flow rate of the molten alloy mixture 200 used in the conventional method. Preferably, the average grain size of the central portion of the final metal strip 220, produced by the increased flow rate of the molten alloy mixture 200 by 30% (compared to the conventional flow rate), is at least 5% smaller than the conventional average grain size of the central portion of a conventional metal strip produced using the conventional method (and the conventional flow rate). Preferably, the average grain size of the central portion of the final metal strip 220 produced by the molten alloy mixture 200 with the flow rate increased by 30% (compared to the conventional flow rate) is at least 10% smaller than the conventional average grain size of the central portion of a conventional metal strip produced using the conventional method (and the conventional flow rate).

[0085] Comparative Example

[0086] An alloy mixture (31.4% NdPr, 0.5% Ga, 0.915% B, balance Fe) is provided in a crucible assembly and melted to form a molten alloy mixture. A melt spinning process is then performed to rapidly solidify the molten alloy mixture (via a rotating wheel assembly) to form a primary metal strip. In this comparative example, no grain size refinement and homogenization process is performed on the primary metal strip. Figure 4AThe image shows FESEM (field emission scanning electron microscope) images of the primary metal ribbon obtained in the comparative example, at magnifications of ×2,500 (for the three cross-sectional views in the second row) and ×100,000 (for the six representative regions in the first and third rows, showing the grains of the primary metal ribbon on the left top side 212a', middle top side 212b', right top side 212c', left bottom side 211a', middle bottom side 211b', and right bottom side 211c'). Figure 5A and Figure 5B The average grain size measurements obtained for the primary metal strips in the comparative examples are shown separately (average grain size on the top side (see...)). Figure 5C and 5D ) and average grain size on the bottom side (see Figure 5C and 5D Tables and charts for calculating the average value of ( ); Figure 5C and Figure 5D The measurements of the average grain size obtained from the primary metal strips in the comparative example are shown separately (the average grain size on the top side and the average grain size on the bottom side are provided separately, instead of as shown). Figure 5A and 5B Tables and charts showing the average values ​​(calculated in the image). The average grain size is obtained using the image-J open-source software. Figure 5A and 5B As shown, the average grain size on the left side of the primary metal band (the average of 212a' and 211a') was measured to be 43.5 nm; the average grain size at the center of the primary metal band (the average of 212b' and 211b') was measured to be 46.9 nm; and the average grain size on the right side of the primary metal band (the average of 212c' and 211c') was measured to be 39.1 nm. Furthermore, as... Figure 5C and 5D As shown, the average grain size of the primary metal band 212a' (left top side) is measured to be 44.7 nm; the average grain size of the primary metal band 212b' (middle top side) is measured to be 49.2 nm; and the average grain size of the primary metal band 212c' (right top side) is measured to be 41.7 nm. Furthermore, as... Figure 5C and 5D As shown, the average grain size of the left bottom side 211a' of the primary metal strip is 42.2 nm; the average grain size of the middle bottom side 211b' of the primary metal strip is 44.7 nm; and the average grain size of the right bottom side 211c' of the primary metal strip is 36.4 nm.

[0087] Exemplary Example 1

[0088] An alloy mixture (alloy composition 31.4% NdPr - 0.5% Ga - 0.915% B - balance Fe) identical to that in the comparative example is provided in a crucible assembly identical to that in the comparative example and melted to form a molten alloy mixture identical to that in the comparative example. The molten alloy mixture is rapidly solidified by a rotating wheel assembly identical to that in the comparative example to form a primary metal strip. In exemplary embodiment 1, a grain size refinement and homogenization process is performed on the primary metal strip (an exemplary embodiment using a grain size refinement and homogenization assembly), including an exemplary embodiment of delivering coolant to the top surface of the primary metal strip. Figure 4B The image shows an FESEM image of the final metal strip of Exemplary Example 1, with a magnification of ×2,500 (3 cross-sectional views in the second row) and ×100,000 (6 representative regions in the first and third rows, showing the grains of the primary metal strip at the left top side 222a', middle top side 222b', right top side 222c', left bottom side 221a', middle bottom side 221b', and right bottom side 221c'). Figure 5A and 5B The average grain size measurements obtained for the final metal strip of Exemplary Example 1 are shown separately (top side (see Figure 5E and 5F The average grain size and bottom side (see) Figure 5E and 5F Tables and charts showing the calculation of the average grain size. Figure 5E and Figure 5F The measured values ​​of the average grain size obtained by the final metal strip of Exemplary Embodiment 1 are shown separately (the average grain size on the top side and the average grain size on the bottom side are provided separately, instead of as shown). Figure 5A and 5BTables and graphs showing the average values ​​(calculated in the original text). The average grain size was obtained using Image-J software. The present invention recognizes that the average grain size on the left side of the final metal band (the average of 222a' and 221a') was measured to be 38.1 nm, which is 12.5% ​​or 5.4 nm smaller than the average grain size on the left side of the primary metal band in the comparative example (the average of 212a' and 211a'). Furthermore, the average grain size at the center of the final metal band (the average of 222b' and 221b') was measured to be 39.1 nm, which is 16.6% or 7.8 nm smaller than the average grain size at the center of the primary metal band in the comparative example (the average of 212b' and 211b'). Additionally, the average grain size on the right side of the final metal band (the average of 222c' and 221c') was measured to be 37.7 nm, which is 3.4% or 1.4 nm smaller than the average grain size on the right side of the primary metal band (212c', 211c') in the comparative example. Furthermore, the average grain size of the top left side 222a' is 5.4 nm or 12.08% smaller than that of the top left side 212a'; the average grain size of the bottom left side 221a' is 5.4 nm or 12.80% smaller than that of the bottom left side 211a'; the average grain size of the top middle side 222b' is 9.1 nm or 18.50% smaller than that of the top middle side 212b'; the average grain size of the bottom middle side 221b' is 6.6 nm or 14.77% smaller than that of the bottom middle side 211b'; and the average grain size of the top right side 222c' is 3 nm or 7.19% smaller than that of the top right side 212c'.

[0089] Furthermore, the difference between the average grain size at the center (average of 222b' and 221b') of 39.1 nm and the average grain size on the left (average of 222a' and 221a') of 38.1 nm is 1 nm (or approximately 2.62% of the average grain size on the left and approximately 2.56% of the average grain size at the center), which is significantly smaller than the difference between the average grain size at the center (average of 212b' and 211b') of 46.9 nm and the average grain size on the left (212a', 211a') of 43.5 nm (3.4 nm, or approximately 7.82% of the average grain size on the left and approximately 7.25% of the average grain size at the center, respectively). Furthermore, the difference between the average grain size of the top center (222b') of 40.1 nm and the average grain size of the left top side (222a') of 39.3 nm is 0.8 nm (or, about 2.04% of the average grain size of the left top side and about 2.00% of the average grain size of the top center), which is significantly smaller than the difference between the average grain size of the top center (212b') of 49.2 nm and the average grain size of the left top side (212a') of 44.7 nm (4.5 nm, or, about 10.07% of the average grain size of the left top side and about 9.15% of the average grain size of the top center). Furthermore, the difference between the average grain size of the bottom center (221b') of 38.1 nm and the average grain size of the left bottom side (221a') of 36.8 nm is 1.3 nm (or approximately 3.53% of the average grain size of the left bottom side and approximately 3.41% of the average grain size of the bottom surface center), which is significantly smaller than the difference between the average grain size of the bottom center (211b') of 44.7 nm and the average grain size of the left bottom side (211a') of 42.2 nm (2.5 nm, or approximately 5.92% of the average grain size of the left bottom side and approximately 5.59% of the average grain size of the bottom center, respectively).

[0090] Furthermore, the difference between the average grain size at the center (the average of 222b' and 221b') of 39.1 nm and the average grain size on the right (the average of 222c' and 221c') of 37.7 nm is 1.4 nm (or approximately 3.71% of the average grain size on the right and approximately 3.58% of the average grain size at the center), which is significantly smaller than the difference between the average grain size at the center (the average of 212b' and 211b') of 46.9 nm and the average grain size on the right (the average of 212c' and 211c') of 39.1 nm (7.8 nm, or approximately 19.95% of the average grain size on the right and approximately 16.63% of the average grain size at the center, respectively). Furthermore, the difference between the average grain size of the top center (222b') of 40.1 nm and the average grain size of the right top side (222c') of 38.7 nm is 1.4 nm (or, approximately 3.62% of the average grain size of the right top side and approximately 3.49% of the average grain size of the top center), which is significantly smaller than the difference between the average grain size of the top center (212b') of 49.2 nm and the average grain size of the right top side (212c') of 41.7 nm (7.5 nm, or approximately 17.99% of the average grain size of the right top side and approximately 15.24% of the average grain size of the top center, respectively). Furthermore, the difference between the average grain size of the bottom center (221b') of 38.1 nm and the average grain size of the right bottom side (221c') of 36.6 nm is 1.5 nm (or approximately 4.01% of the average grain size of the right bottom side and approximately 3.94% of the average grain size of the bottom center), which is significantly smaller than the difference between the average grain size of the bottom center (211b') of 44.7 nm and the average grain size of the right bottom side (211c') of 36.4 nm (which is 8.3 nm, or approximately 22.80% of the average grain size of the right bottom side and approximately 18.57% of the average grain size of the bottom center, respectively).

[0091] The present invention recognizes that, in exemplary embodiments of the grain size refinement and homogenization process, including exemplary embodiments of delivering coolant to the primary metal strip via grain size refinement and homogenization components, one or more of the following advantages and / or improvements can be achieved: a smaller and more uniform width of the final metal strip compared to conventional methods and compared to the primary metal strip (e.g., smaller differences between the average grain sizes on the left (average, top, bottom), center (average, top, bottom), and right (average, top, bottom) sides); and / or a smaller average grain size on the left side of the final metal strip compared to conventional methods and compared to the left side of the primary metal strip; and / or a smaller average grain size on the left side of the final metal strip compared to conventional methods and compared to the center of the primary metal strip. The average grain size at the center of the final metal ribbon is smaller; and / or the average grain size on the right side of the final metal ribbon is smaller compared to conventional methods and compared to the right side of the primary metal ribbon; and / or the average grain size on the left top side of the final metal ribbon is smaller compared to conventional methods and compared to the left top side of the primary metal ribbon; and / or the average grain size at the top center of the final metal ribbon is smaller compared to conventional methods and compared to the top center of the primary metal ribbon; and / or the average grain size on the right top side of the final metal ribbon is smaller compared to conventional methods and compared to the right top side of the primary metal ribbon; and / or the average grain size on the left bottom side of the final metal ribbon is smaller compared to conventional methods and compared to the left bottom side of the primary metal ribbon; and / or the average grain size on the left bottom side of the final metal ribbon is smaller compared to conventional methods and compared to... The average grain size of the bottom center of the final metal strip is smaller than that of the bottom center of the primary metal strip; and / or the average grain size of the right bottom side of the final metal strip is smaller than that of the conventional method and the right bottom side of the primary metal strip; and / or the flow rate of the molten alloy mixture supplied to the rotating wheel assembly (during the melt spinning process) is increased (compared to the conventional method) without increasing the wheel speed (or rotational speed), which achieves one or more of the advantages and / or improvements described above and in this invention; and / or the wheel speed (or rotational speed) of the rotating wheel (during the melt spinning process) is reduced (compared to the conventional method) without increasing the flow rate of the molten alloy mixture supplied to the rotating wheel assembly, which achieves... This achieves one or more of the advantages and / or improvements described above and in this invention; and / or increases the thickness of the primary and final metal strips (compared to conventional methods) without reducing the flow rate of the molten alloy mixture supplied to the rotating wheel assembly, thus achieving one or more of the advantages and / or improvements described above and in this invention; and / or increases the thickness of the primary and final metal strips (compared to conventional methods) without reducing the wheel speed (or rotational speed) of the rotating wheel assembly, thus achieving one or more of the advantages and / or improvements described above and in this invention; and / or extends the running time of the rotating wheel by reducing its wheel speed (or rotational speed) without affecting the average grain size and its uniformity.

[0092] While various embodiments based on the disclosed principles have been described above, it should be understood that they are presented by way of example only and not as limiting. Therefore, the breadth and scope of the exemplary embodiments described herein should not be limited to any of the exemplary embodiments described above, but should be defined solely by the claims arising from this disclosure and their equivalents. Furthermore, the advantages and features described above are provided in the described embodiments, but should not limit the application of the published claims to processes and structures that achieve any or all of the above advantages.

[0093] The various terms used herein have specific meanings within the art. Whether a particular term should be interpreted as such a “technical term” depends on the context in which it is used. Terms should be interpreted according to the context in which they are used in this invention and the understanding of those skilled in the art in the context of disclosure. The definitions provided herein do not exclude other meanings that may be assigned to these terms depending on the context of disclosure.

[0094] Words related to comparison, measurement, and time, such as “at that time,” “quite,” “during,” and “completed,” should be understood as meaning “basically at that time,” “basically quite,” “basically during,” and “basically completed.” Among these, “basically” means that such comparison, measurement, and time arrangement are feasible for completing the implicit or explicit expected results.

[0095] Furthermore, the chapter headings and subject headings herein are intended to align with recommendations in various patent laws and practices, or otherwise provide organizational clues. These headings should not limit or describe any embodiments listed in the claims that may arise from this disclosure. Specifically, the description of a technology in the “Background Art” section should not be construed as an admission that the technology is prior art to any embodiment of this disclosure. Furthermore, any singular reference to “invention” in this statement should not be used to argue that there is only one novel aspect in the invention. Multiple inventions may be proposed based on the limitations of the claims arising from the invention, and these claims accordingly define the inventions protected thereunder and their equivalents. In all cases, the scope of such claims should be considered in light of the advantages of the invention itself, but should not be limited by the headings herein.

Claims

1. A method for producing magnetic materials, the method comprising: Provide alloy mixtures; Melt the alloy mixture to obtain a molten alloy mixture; Establish an initial environment indoors, including maintaining consistent pressure and internal temperature conditions within the room; After establishing the initial environment in the room, the molten alloy mixture is rapidly solidified in the room by a melt spinning process using a rotating wheel to obtain a primary metal strip. The primary metal strip has a long, flat body with a bottom side and a top side, with the top side opposite to the bottom side. After establishing the initial environment in the room, the primary metal strip undergoes a grain size refinement and homogenization process to form the final metal strip. The grain size refinement and homogenization process includes: The first coolant is delivered directly from the first nozzle of the coolant assembly to at least the central region on the top side of the primary metal strip; and The first coolant is delivered directly from the second nozzle of the coolant assembly to at least the central region of the underside of the primary metal strip, wherein the first coolant is delivered from the second nozzle of the coolant assembly to at least the central region of the underside of the primary metal strip, which is no longer in contact with the rotating wheel; and During and after the delivery of the first coolant from the first and second nozzles, an environment is dynamically maintained in the chamber consistent with the initial environment established in the chamber, including dynamically maintaining at least one of the internal pressure conditions and internal temperature conditions in the chamber based on the delivery of the first coolant.

2. The method for producing magnetic materials according to claim 1, wherein, The first coolant delivered to at least the central region of the top and bottom sides of the primary metal strip comprises a stream of liquid argon, liquid helium, and / or one or more other liquid inert gases.

3. The method for producing magnetic materials according to claim 1, wherein, The average grain size of the central portion of the bottom side of the final metal strip is less than 40 nm.

4. The method for producing magnetic materials according to claim 1, wherein, The flow rate of the molten alloy mixture supplied to the rotating wheel is from 0.2 kg / min to 5.0 kg / min; and The rapid curing includes rotating the rotating wheel at a first wheel speed; The average grain size of the central portion of the bottom side of the final metal strip is less than 40 nm.

5. The method for producing magnetic materials according to claim 1, wherein one or more of the following are applicable: The difference between the average grain size of the central portion of the final metal strip and the average grain size of an edge portion of the final metal strip is less than 10%; and / or The difference between the average grain size of the central portion of the final metal strip and the average grain size of the two edge portions of the final metal strip is less than 10%; and / or The difference between the average grain size of the central portion of the final metal strip and the average grain size of one edge portion of the final metal strip is less than 5 nm; and / or The difference between the average grain size of the central portion of the final metal strip and the average grain size of the two edge portions of the final metal strip is less than 5 nm; and / or The average grain size of the central portion and the two edge portions of the final metal strip is less than 50 nm; and / or The average grain size of the central portion of the final metal strip is less than 50 nm.

6. The method for producing magnetic materials according to claim 1, wherein one or more of the following are applicable: The difference between the average grain size of the central portion of the final metal strip and the average grain size of an edge portion of the final metal strip is less than 5%; and / or The difference between the average grain size of the central portion of the final metal strip and the average grain size of the two edge portions of the final metal strip is less than 5%; and / or The difference between the average grain size of the central portion of the final metal strip and the average grain size of one edge portion of the final metal strip is less than 2 nm; and / or The difference between the average grain size of the central portion of the final metal strip and the average grain size of the two edge portions of the final metal strip is less than 2 nm; and / or The average grain size of the central portion and the two edge portions of the final metal strip is less than 40 nm; and / or The average grain size of the central portion of the final metal strip is below 40 nm.

7. The method for producing magnetic materials according to claim 1, wherein, The alloy mixture comprises RE-Fe-Co-MB, wherein RE is one or more rare earth elements, and wherein M is one or more elements selected from Ga, Cu, Al, Nb, Zr, W, Ti, Si, C and Mo.

8. A method for producing magnetic materials, the method comprising: Provide alloy mixtures; Melt the alloy mixture to obtain a molten alloy mixture; Establish an initial environment indoors, including maintaining consistent pressure and internal temperature conditions within the room; After establishing the initial environment in the room, the molten alloy mixture is rapidly solidified in the room by a melt spinning process using a rotating wheel to obtain a primary metal strip. The primary metal strip has a long, flat body with a bottom side and a top side, with the top side opposite to the bottom side. After establishing the initial environment in the room, the primary metal strip undergoes a grain size refinement and homogenization process to form the final metal strip. The grain size refinement and homogenization process includes: The first coolant is delivered directly from the first nozzle of the coolant assembly to at least the central region on the top side of the primary metal strip; and The first coolant is delivered directly from the second nozzle of the coolant assembly to at least the central region of the underside of the primary metal strip, wherein the first coolant is delivered from the second nozzle of the coolant assembly to at least the central region of the underside of the primary metal strip, which is no longer in contact with the rotating wheel; and During and after the delivery of the first coolant from the first and second nozzles, an environment consistent with the initial environment established in the chamber is dynamically maintained in the chamber, including dynamically maintaining at least one of the internal pressure conditions and internal temperature conditions in the chamber based on the delivery of the first coolant; Wherein, the difference between the average grain size of the central region on the bottom side of the final metal strip and the average grain size of the edge portion on the bottom side of the final metal strip is less than 10%; and / or Wherein, the difference between the average grain size of the central region on the top side of the final metal strip and the average grain size of the edge portion on the top side of the final metal strip is less than 10%; and / or Wherein, the difference between the average grain size of the central region on the bottom side of the final metal strip and the average grain size of the edge portion on the bottom side of the final metal strip is less than 5 nm; and / or The difference between the average grain size of the central region on the top side of the final metal strip and the average grain size of the edge portion on the top side of the final metal strip is less than 5 nm.

9. The method of claim 8, wherein, One or more of the following apply: Wherein, the difference between the average grain size of the central region on the bottom side of the final metal strip and the average grain size of the edge portion on the bottom side of the final metal strip is less than 5%; and / or Wherein, the difference between the average grain size of the central region on the top side of the final metal strip and the average grain size of the edge portion on the top side of the final metal strip is less than 5%; and / or Wherein, the difference between the average grain size of the central region on the bottom side of the final metal strip and the average grain size of the edge portion on the bottom side of the final metal strip is less than 2 nm; and / or The difference between the average grain size of the central region on the top side of the final metal strip and the average grain size of the edge portion on the top side of the final metal strip is less than 2 nm.

10. The method for producing magnetic materials according to claim 8, wherein, The first coolant delivered to the central regions of the top and bottom sides of the primary metal strip comprises a stream of liquid argon, liquid helium, and / or one or more other liquid inert gases.

11. The method for producing magnetic materials according to claim 8, wherein, The flow rate of the molten alloy mixture supplied to the rotating wheel is from 0.2 kg / min to 5.0 kg / min; The rapid curing includes rotating the rotating wheel at a first wheel speed; The average grain size of the central portion of the bottom side of the final metal strip is less than 40 nm.

12. The method for producing magnetic materials according to claim 8, wherein, The alloy mixture comprises RE-Fe-Co-MB, wherein RE is one or more rare earth elements, and wherein M is one or more elements selected from Ga, Cu, Al, Nb, Zr, W, Ti, Si, C and Mo.

13. A method for producing magnetic materials, the method comprising: Provide alloy mixtures; Melt the alloy mixture to obtain a molten alloy mixture; Establish an initial environment indoors, including maintaining consistent pressure and internal temperature conditions within the room; After establishing the initial environment in the room, the molten alloy mixture is rapidly solidified in the room by a melt spinning process using a rotating wheel to obtain a primary metal strip. The primary metal strip has a long, flat body with a bottom side and a top side, with the top side opposite to the bottom side. and After establishing the initial environment within the chamber, a grain size refinement and homogenization process is performed within the chamber to form the final metal ribbon. This grain size refinement and homogenization process includes: The first coolant is delivered directly from the first nozzle of the coolant assembly to at least the central region on the top side of the primary metal strip; and The first coolant is delivered directly from the second nozzle of the coolant assembly to at least the central region of the underside of the primary metal strip, wherein the first coolant is delivered from the second nozzle of the coolant assembly to at least the central region of the underside of the primary metal strip, which is no longer in contact with the rotating wheel; and During and after the delivery of the first coolant from the first and second nozzles, an environment consistent with the initial environment established in the chamber is dynamically maintained in the chamber, including dynamically maintaining at least one of the internal pressure conditions and internal temperature conditions in the chamber based on the delivery of the first coolant; Wherein, the difference between the average grain size of the central region on the bottom side of the final metal strip and the average grain size of the edge portion on the bottom side of the final metal strip is less than 5 nm; and The difference between the average grain size of the central region on the top side of the final metal strip and the average grain size of the edge portion on the top side of the final metal strip is less than 5 nm.

14. The method for producing magnetic materials according to claim 13, wherein, The first coolant delivered to at least the central region of the top and bottom sides of the primary metal strip comprises a stream of liquid argon, liquid helium, and / or one or more other liquid inert gases.

15. The method for producing magnetic materials according to claim 13, wherein, The flow rate of the molten alloy mixture supplied to the rotating wheel is from 0.2 kg / min to 5.0 kg / min; and The rapid curing process includes rotating the rotating wheel at a first-round speed.

16. The method for producing magnetic materials according to claim 13, wherein one or more of the following are applicable: The difference between the average grain size of the central portion of the final metal strip and the average grain size of an edge portion of the final metal strip is less than 10%; and / or The difference between the average grain size of the central portion of the final metal strip and the average grain size of the two edge portions of the final metal strip is less than 10%.

17. The method of claim 16, wherein, The difference between the average grain size of the central portion of the final metal strip and the average grain size of the edge portion of the final metal strip is less than 5%; and / or The difference between the average grain size of the central portion of the final metal strip and the average grain size of the two edge portions of the final metal strip is less than 5%.

18. The method for producing magnetic materials according to claim 13, wherein, The alloy mixture comprises RE-Fe-Co-MB, wherein RE is one or more rare earth elements, and wherein M is one or more elements selected from Ga, Cu, Al, Nb, Zr, W, Ti, Si, C and Mo.

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