Stirring paddle and stirring furnace for producing silicon carbide aluminum-based composite material

Abstract

The embodiment of the utility model provides a stirring paddle and a stirring furnace for producing a silicon carbide aluminum-based composite material, and relates to the field of new materials. The stirring paddle comprises a rotating shaft and more than three paddle groups arranged on the rotating shaft; the paddle groups comprise one group of upturning paddle groups, one group of pressing paddle groups and more than one group of axial paddle groups, the upturning paddle groups are positioned below the pressing paddle groups, and the axial paddle groups are sequentially arranged between the upturning paddle groups and the pressing paddle groups; in the projections of the adjacent paddle groups on the horizontal plane, the included angle between the adjacent paddles is 1 / 3 alpha-2 / 3 alpha, and alpha is the included angle between the adjacent paddles in the paddle groups. The paddles comprise the upturning paddle set, the pressing paddle set and the axial paddle set, the upturning paddle set is located at the lowest position, the pressing paddle set is located at the uppermost position, the axial paddle set is located in the middle, and meanwhile the adjacent paddle sets are arranged in a staggered mode, so that silicon carbide particles can be evenly dispersed in the aluminum alloy melt better.

Description

Technical Field

[0001] This utility model relates to the field of new materials technology, and more specifically, to a stirring paddle and a stirring furnace for the production of silicon carbide aluminum-based composite materials. Background Technology

[0002] Silicon carbide aluminum matrix composites are a type of particle-reinforced metal matrix composite material that combines the high specific strength, good plasticity and low density of aluminum alloy matrix with the high hardness and low coefficient of thermal expansion of Si C particles. It is a new generation of structural material developed after Al alloys and Ti alloys.

[0003] Silicon carbide aluminum-based composite materials have advantages such as lightweight, high strength and stiffness, excellent wear resistance, high temperature stability and corrosion resistance, low coefficient of thermal expansion, high thermal conductivity and adjustable coefficient of thermal expansion. They are widely used in aerospace, transportation, electronics, military, precision instruments and optical instruments, and shipbuilding. In addition, they can be used as heat dissipation and packaging materials in the electronics industry.

[0004] For the preparation of silicon carbide aluminum matrix composites, the uniformity of silicon carbide particle dispersion in the melt has a great influence on the performance of silicon carbide aluminum matrix composite products. In some existing silicon carbide aluminum matrix composite preparation processes, the agglomeration of silicon carbide particles in the melt leads to a significant reduction in the uniformity of silicon carbide particle dispersion, which is not conducive to the preparation of high-performance silicon carbide aluminum matrix composites.

[0005] Therefore, this application is hereby submitted. Utility Model Content

[0006] The purpose of this invention is to provide a stirring paddle and a stirring furnace for the production of silicon carbide aluminum-based composite materials, which can overcome the problem that silicon carbide particles are difficult to disperse uniformly in aluminum alloy melt.

[0007] The embodiments of this utility model can be implemented as follows:

[0008] In a first aspect, the present invention provides a stirring paddle, including a rotating shaft and three or more blade groups disposed on the rotating shaft;

[0009] The blade assembly includes a set of upward-tilting blades, a set of downward-tilting blades, and one or more axial blades. The upward-tilting blades are located below the downward-tilting blades, and the axial blades are sequentially arranged between the upward-tilting blades and the downward-tilting blades.

[0010] In the projection of adjacent blade groups onto the horizontal plane, the included angle between adjacent blades is 1 / 3α-2 / 3α, where α is the included angle between adjacent blades in the blade group.

[0011] In an optional embodiment, the angle between the blades in the upward-tilting blade assembly and the horizontal plane is 3°-7°.

[0012] In an optional embodiment, the angle between the blades in the downward-pressing blade assembly and the horizontal plane is 3°-7°.

[0013] In an alternative embodiment, each of the blades is flat.

[0014] In an optional implementation, the axial blade assembly has an odd number of blades.

[0015] In an optional embodiment, the axial blade assembly may have one or three sets.

[0016] In an optional embodiment, each blade group includes an odd number of blades, and the blades in each blade group are evenly distributed circumferentially.

[0017] In an optional implementation, each blade assembly includes 3, 5, or 7 blades.

[0018] Secondly, this utility model provides a stirring furnace for the production of silicon carbide aluminum-based composite materials, including the stirring paddle described in any of the foregoing embodiments.

[0019] In an optional embodiment, a vacuum furnace body is included, a heat preservation furnace is disposed inside the vacuum furnace body, a stirring vessel is disposed inside the heat preservation furnace, and a stirring paddle that can be driven by a power component is disposed inside the stirring vessel.

[0020] In an optional embodiment, the vacuum furnace body is further provided with an exhaust pipe connected to a vacuum pump, and the exhaust pipe is provided with a filtration system.

[0021] And / or, a powder silo is provided above the vacuum furnace body, and a discharge mechanism is provided on the powder silo, with the discharge port of the discharge mechanism located above the mixing vessel.

[0022] The beneficial effects of the stirring paddle and stirring furnace for producing silicon carbide aluminum-based composite materials provided in this embodiment of the invention include:

[0023] The blades in this application include an upward-tilting blade group, a downward-tilting blade group, and an axial blade group, wherein the upward-tilting blade group is located at the bottom, the downward-tilting blade group is located at the top, and the axial blade group is located in the middle. At the same time, the staggered arrangement between adjacent blade groups is more conducive to the uniform dispersion of silicon carbide particles in the aluminum alloy melt. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the agitator provided in this application from a first-view perspective.

[0026] Figure 2 for Figure 1 Sectional view of section AA;

[0027] Figure 3 for Figure 1 Sectional view of the middle BB section;

[0028] Figure 4 for Figure 1 Sectional view of the CC section;

[0029] Figure 5 This is a first-view structural schematic diagram of the stirred furnace provided in this application;

[0030] Figure 6 This is a schematic diagram of the stirred furnace provided in Example 1 from a first-view perspective;

[0031] Figure 7 This is a schematic diagram of the stirred furnace provided in Example 2 from a first-view perspective.

[0032] Icons: 100-Agitator; 110-Shaft; 120-Upward-tilting blade assembly; 130-Downward-pressing blade assembly; 140-Axial blade assembly; 121-Blade; 200-Vacuum furnace body; 300-Insulation furnace; 400-Agitator; 500-Power assembly; 600-Filtration system; 700-Vacuum pump; 800-Powder silo. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0037] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0038] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0039] During the preparation of silicon carbide, the possible reactions are: 3SiC + 4Al2O3 → 3SiO2 + 4Al2O + CO and SiC + 2Al2O3 → Al2Si2O6 + 2CO. During the reaction, a servo-driven stirring paddle 100 can be used to rotate and stir the aluminum alloy melt containing micron or nano-sized silicon carbide particles at high speed or variable speed. However, existing stirring paddles 100, such as conventional inclined (folded) blades, curved blades, and spiral blade stirrers, cannot effectively disperse silicon carbide particles.

[0040] To solve the above problems, this utility model provides a stirring paddle 100, including a rotating shaft 110 and three or more blades 121 arranged on the rotating shaft 110.

[0041] The blade group 121 includes a set of upward-tilting blade group 120, a set of downward-tilting blade group 130 and a set of more than one axial blade group 140. The upward-tilting blade group 120 is located below the downward-tilting blade group 130, and the axial blade group 140 is arranged between the upward-tilting blade group 120 and the downward-tilting blade group 130.

[0042] In the projection of adjacent blade groups 121 onto the horizontal plane, the included angle between adjacent blades 121 is 1 / 3α-2 / 3α, where α is the included angle between adjacent blades 121 in the blade group 121.

[0043] The blade 121 in this application includes an upward blade group 120, a downward blade group 130, and an axial blade group 140, wherein the upward blade group 120 is located at the bottom, the downward blade group 130 is located at the top, and the axial blade group 140 is located in the middle. At the same time, the staggered arrangement between adjacent blade groups 121 is more conducive to the uniform dispersion of silicon carbide particles in the aluminum alloy melt.

[0044] Furthermore, in the projection of adjacent blade groups 121 onto the horizontal plane, the included angle between adjacent blades 121 is 1 / 3α-2 / 3α, specifically 6 / 18α, 7 / 18α, 8 / 18α, 9 / 18α, 10 / 18α, 11 / 18α, 12 / 18α, preferably 1 / 2α.

[0045] In an optional embodiment, the angle between the blade 121 in the upward-tilting blade assembly 120 and the horizontal plane is 3°-7°, for example, it can be any value between 3°, 4°, 5°, 6°, 7° or 3°-7°, preferably 5°.

[0046] In an optional embodiment, the angle between the blade 121 in the downward-pressing blade assembly 130 and the horizontal plane is 3°-7°, for example, it can be any value between 3°, 4°, 5°, 6°, 7° or 3°-7°, preferably 5°.

[0047] In an optional embodiment, each blade 121 is flat, specifically rectangular, and can be integrally formed with the rotating shaft 110 or fixedly connected, preferably integrally formed.

[0048] In an optional embodiment, the axial blade assembly 140 has an odd number of blades, which is beneficial for maintaining the stable operation of the agitator 100.

[0049] In an optional embodiment, the axial blade group 140 has one or three groups. If the number of axial blades 121 is too large, they cannot cooperate with the upward blade group 120 and the downward blade group 130, which will reduce the uniformity of silicon carbide particle dispersion in the aluminum alloy melt.

[0050] In an optional embodiment, each group of blades 121 includes an odd number of blades 121, and the blades 121 in each group of blades 121 are evenly distributed circumferentially.

[0051] The arrangement of an odd number of blades 121 in the blade group 121 is beneficial to the stable operation of the agitator 100.

[0052] In an optional embodiment, each group of blades 121 includes 3, 5 or 7 blades 121.

[0053] If there are too many blades 121 in each group of blades 121, the effect of improving the uniformity of silicon carbide dispersion will not be obvious. If there are too few blades 121, the blades 121 need to withstand greater torque, and the requirements for material performance will be higher.

[0054] This utility model also provides a stirring furnace for the production of silicon carbide aluminum-based composite materials, including the stirring paddle 100 described in any of the foregoing embodiments.

[0055] In an optional embodiment, a vacuum furnace body 200 is included, a heat preservation furnace 300 is provided inside the vacuum furnace body 200, a stirring vessel 400 is provided inside the heat preservation furnace 300, and a stirring paddle 100 that can be driven by a power component 500 is provided inside the stirring vessel 400.

[0056] A vacuum furnace was used to prepare silicon carbide aluminum-based composite materials under low vacuum conditions, eliminating the risk of aluminum melt overflow caused by gas.

[0057] In an optional embodiment, the vacuum furnace body 200 is also provided with an exhaust pipe connected to the vacuum pump 700, and the exhaust pipe is provided with a filter system 600 to provide vacuum conditions inside the furnace and prevent dust, particles and other particles inside the furnace from overflowing.

[0058] In an optional embodiment, a powder silo 800 is provided above the vacuum furnace body 200, and a discharge mechanism is provided on the powder silo 800. The discharge port of the discharge mechanism is located above the mixing vessel 400, which facilitates the addition of powder to the mixing vessel 400.

[0059] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0060] Example 1

[0061] This embodiment provides a stirring furnace for the production of silicon carbide aluminum-based composite materials, such as... Figure 1-5 As shown, it includes a vacuum furnace body 200, a heat preservation furnace 300 is provided inside the vacuum furnace body 200, a stirring vessel 400 is provided inside the heat preservation furnace 300, and a rotating shaft 110 that can be driven by a power component 500 and three sets of blades 121 provided on the rotating shaft 110, each set of blades 121 including 5 blades 121;

[0062] The blade group 121 includes an upward-tilting blade group 120, a downward-pressing blade group 130, and an axial blade group 140. The upward-tilting blade group 120 is located below the downward-pressing blade group 130, and the axial blade group 140 is sequentially arranged between the upward-tilting blade group 120 and the downward-pressing blade group 130. In the projection of adjacent blade groups 121 onto the horizontal plane, the included angle between adjacent blades 121 is 36°, the included angle between the blades 121 in the upward-tilting blade group 120 and the horizontal plane is 5°, and the included angle between the blades 121 in the downward-pressing blade group 130 and the horizontal plane is 5°.

[0063] The vacuum furnace body 200 is also provided with an exhaust pipe connected to the vacuum pump 700, and the exhaust pipe is provided with a filter system 600; a powder silo 800 is provided above the vacuum furnace body 200, and a discharge mechanism is provided on the powder silo 800, the discharge port of the discharge mechanism being located above the mixing vessel 400.

[0064] Comparative Example 1

[0065] This comparative example provides a stirring furnace for the production of silicon carbide aluminum-based composite materials. The only difference from Example 1 is that the included angle between adjacent blades 121 in the projection of adjacent blades 121 groups on the horizontal plane is 15°.

[0066] Comparative Example 2

[0067] This comparative example provides a stirring furnace for the production of silicon carbide aluminum-based composite materials. The only difference from Example 1 is that the angle between the blade 121 in the upward-turning blade group 120 and the horizontal plane is 2°, and the angle between the blade 121 in the downward-pressing blade group 130 and the horizontal plane is 9°.

[0068] Comparative Example 3

[0069] This comparative example provides a stirring furnace for the production of silicon carbide aluminum-based composite materials. The only difference from Example 1 is that the axial blade assembly 140 is not provided.

[0070] Silicon carbide aluminum-based composite materials were produced using the stirred furnaces described in the above embodiments and comparative examples. The mixture was stirred at 500 r / min for 2 hours to obtain an aluminum-based composite melt containing silicon carbide particles. This melt was then poured into a mold to form a silicon carbide aluminum-based composite ingot. Metallographic analysis was performed on the ingot, and the metallographic image of the silicon carbide aluminum-based composite ingot in Example 1 is shown below. Figure 6 As shown, the metallographic image of the silicon carbide aluminum-based composite ingot obtained in Comparative Example 1 is as follows. Figure 7 As shown, from Figure 6 , 7It can also be seen that the silicon carbide in the ingot of Example 1 is more uniformly dispersed, while the uniformity of silicon carbide dispersion in the ingot of Comparative Example 1 is far inferior to that of Example 1. The uniformity of silicon carbide dispersion in the ingots obtained from other comparative examples is worse than that of Comparative Example 1. This indicates that the stirring furnace in Example 1 is more conducive to the uniform dispersion of silicon carbide particles in aluminum-based alloys compared to the comparative examples.

[0071] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A stirring paddle, characterized in that, The rotating shaft and three or more paddle groups arranged on the rotating shaft are included; The paddle groups include an upper turning paddle group, a lower pressing paddle group and one or more axial paddle groups, the upper turning paddle group is arranged below the lower pressing paddle group, and the axial paddle groups are arranged between the upper turning paddle group and the lower pressing paddle group in sequence; The angle between adjacent paddles in the projection of adjacent paddle groups on a horizontal plane is 1 / 3α-2 / 3α, and the α is the angle between adjacent paddles in a paddle group.

2. The paddle of claim 1, wherein The angle between the paddle in the upper turning paddle group and the horizontal plane is 3°-7°. And / or, the angle between the paddle in the lower pressing paddle group and the horizontal plane is 3°-7°.

3. The paddle of claim 1, wherein Each of the paddles is in a flat plate shape.

4. The paddle of claim 1, wherein The axial paddle group has an odd number of groups.

5. The paddle of claim 1 wherein, The axial paddle group has 1 group or 3 groups.

6. The paddle of claim 1, wherein Each of the paddle groups includes an odd number of paddles, and the paddles in each of the paddle groups are uniformly distributed in a circumferential direction.

7. The paddle of claim 1 wherein, Each of the paddle groups includes 3, 5 or 7 paddles.

8. A stirring furnace for producing silicon carbide aluminum-based composite materials, characterized in that, The stirring paddle of any one of claims 1-7 is included.

9. The stirring furnace for producing silicon carbide aluminum-based composite material according to claim 8, wherein A vacuum furnace body is included, the vacuum furnace body is arranged with a heat preservation furnace, the heat preservation furnace is arranged with a stirring kettle, and the stirring kettle is arranged with a stirring paddle capable of being driven by a power assembly.

10. The stirring furnace for producing silicon carbide aluminum-based composite material according to claim 9, wherein The vacuum furnace body is further arranged with an exhaust pipe connected with a vacuum pump, and the exhaust pipe is arranged with a filtering system; And / or, the vacuum furnace body is arranged above with a powder bin, the powder bin is arranged with a discharging mechanism, and a discharging opening of the discharging mechanism is located above the stirring kettle.

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