Continuous alumina fiber reinforced metal matrix composite core-in-sheath wire manufacturing apparatus and method

Abstract

This invention discloses a device and method for preparing continuous alumina fiber-reinforced metal-based composite core wire, belonging to the field of structural materials technology. The device includes an unwinding machine, an insulated pipe, a traction machine, and a winding machine. One end of the insulated pipe is connected to a furnace, and the other end is provided with a nozzle. A connecting cavity is provided below the nozzle, and the nozzle is inserted into the connecting cavity. A yarn guide tube is provided inside the nozzle. Yarn is wound on the unwinding machine, and the yarn is pulled by the traction machine into the yarn guide tube, exiting from the bottom of the yarn guide tube and being wound onto the winding machine. The preparation method of this invention not only avoids fiber breakage but also produces wire of uniform thickness, reducing material waste and ensuring product performance. The continuous alumina-reinforced aluminum-based composite core wire does not produce interface effects, effectively solving the shortcomings of long-distance, heavy, and long-term suspension deformation of cable lines in the field of power transmission.

Description

Technical Field

[0001] This invention relates to an apparatus and method for preparing continuous alumina fiber reinforced metal matrix composite core wire, belonging to the field of structural materials technology. Background Technology

[0002] Alumina fiber possesses low thermal conductivity, low thermal shrinkage, and low heat capacity, making it one of the newest ultra-lightweight high-temperature insulation materials both domestically and internationally. Due to the good wettability of alumina fibers with the metal matrix and minimal interfacial reaction, the mechanical properties, wear resistance, and hardness of the composite material are improved, while the coefficient of thermal expansion is reduced. Alumina fiber-reinforced metal matrix composites are mainly used in high-load mechanical parts, high-temperature and high-speed rotating parts, and high-functionality components with lightweight requirements, such as automotive brake pads, high-temperature cables, and helicopter transmission devices. Continuous alumina fiber-reinforced aluminum matrix composites, in particular, exhibit very high specific stiffness and specific strength in the fiber direction, as well as good fatigue resistance, creep resistance, and electrical conductivity. They are primarily used in aerospace, automotive, and power transmission fields. In the power transmission field, as a reinforcing core, this composite material is expected to replace the heavy traditional steel reinforcing core and become a new generation of long-distance power transmission materials.

[0003] However, alumina fibers are highly brittle. Traditional methods for preparing alumina fiber-reinforced metal matrix composite wires involve directly drawing the alumina fibers in molten metal, which not only easily leads to fiber breakage but also fails to produce materials with uniform fineness. This prevents the superior performance of alumina fiber-reinforced metal matrix composites from being fully realized during service, and may even pose significant safety hazards. Summary of the Invention

[0004] [Technical Issues]

[0005] Due to the high brittleness of alumina fibers, the traditional preparation method of placing alumina fibers in molten metal for direct drawing not only causes fiber breakage but also fails to produce alumina fiber-reinforced metal matrix composite wires with uniform fineness, thus significantly reducing their excellent performance.

[0006] [Technical Solution]

[0007] To address the aforementioned problems, this invention provides an apparatus and method for preparing continuous alumina fiber reinforced metal matrix composite core wire.

[0008] The first objective of this invention is to provide a continuous alumina fiber reinforced metal matrix composite core wire preparation apparatus, comprising an unwinding machine, an insulated pipe, a traction machine, and a winding machine. One end of the insulated pipe is connected to a furnace, and the other end is provided with a nozzle. A connecting cavity is provided below the nozzle, and the nozzle is inserted into the connecting cavity. A yarn guide tube is provided inside the nozzle. Yarn is wound on the unwinding machine, and the yarn is pulled by the traction machine into the yarn guide tube and then exits from the bottom of the yarn guide tube and is wound onto the winding machine.

[0009] In one embodiment of the present invention, the cross-section of the leak nozzle is an inverted triangle with the opening facing downwards. The leak nozzle is connected to the furnace through an insulated pipe, and there is a gap between the inner wall of the leak nozzle and the outer wall of the yarn guide tube.

[0010] In one embodiment of the present invention, the yarn is alumina fiber yarn; molten aluminum is provided in the furnace, and the molten aluminum flows into the bonding cavity through the gap between the inner wall of the nozzle and the outer wall of the yarn guide tube via a heat-insulating pipe, and wraps the alumina fiber yarn that passes through the bottom of the yarn guide tube to form an alumina fiber reinforced metal matrix composite core wire; the inner core of the alumina fiber reinforced metal matrix composite core wire is an alumina fiber yarn layer, and the alumina fiber yarn layer is covered with an aluminum layer.

[0011] In one embodiment of the present invention, nitrogen gas is introduced into the bonding cavity and the furnace; a cooling air mechanism is also connected to the bonding cavity; a filter device is also provided in the furnace; a valve and a pressure gauge are provided on the heat preservation pipe, and the valve is a solenoid valve or an electric valve; the unwinding machine, traction machine and winding machine are all rollers.

[0012] The second objective of this invention is to provide a method for preparing continuous alumina fiber reinforced metal matrix composite sheathed core wire, the method employing the aforementioned continuous alumina fiber reinforced metal matrix composite sheathed core wire preparation apparatus, comprising the following steps:

[0013] (1) The aluminum block is melted into molten aluminum in a furnace, and the molten aluminum is filtered and then enters the bonding cavity through an insulated pipe;

[0014] (2) The continuous alumina fiber yarn enters the bonding cavity through unwinding;

[0015] (3) Nitrogen gas is introduced into the cavity, and the aluminum liquid wraps the yarn inside. Finally, it is wound into shape by a winding machine.

[0016] In one embodiment of the present invention, the temperature of the furnace in step (1) is 750°C; in order to prevent the molten aluminum from solidifying again in step (1), the temperature of the insulation pipe is >660.4°C.

[0017] In one embodiment of the present invention, nitrogen gas is introduced into the furnace in step (1) to prevent the oxidation of aluminum.

[0018] In one embodiment of the present invention, the alumina fiber mentioned in step (2) is Akabane alumina continuous fiber with a fineness ranging from 55 to 400 Tex; the alumina fiber yarn mentioned in step (2) is a fiber yarn obtained by twisting 5 to 10 alumina fibers, with a twist of 40 to 80 twists / meter.

[0019] In one embodiment of the present invention, nitrogen gas is introduced into the bonding cavity in step (3) to prevent oxidation of the molten aluminum before solidification; cold air is introduced into the bonding cavity in step (3) to accelerate the solidification of the molten aluminum, so that it is firmly wrapped around the outside of the alumina fiber yarn.

[0020] The third objective of this invention is to provide the application of the continuous alumina fiber reinforced metal matrix composite core wire prepared by the aforementioned continuous alumina fiber reinforced metal matrix composite core wire preparation apparatus or method in the field of power transmission; the continuous alumina fiber reinforced metal matrix composite core wire of this invention can also be applied to high-load mechanical parts, high-temperature and high-speed rotating parts, and high-functional components with lightweight requirements.

[0021] Beneficial effects

[0022] (1) Compared with the traditional method of preparing alumina fiber reinforced metal matrix composite wire, the preparation method of the present invention can not only avoid fiber breakage, but also obtain wire with uniform thickness, which reduces material waste and ensures product performance.

[0023] (2) The continuous alumina-reinforced aluminum-based composite core wire of the present invention will not produce interface effects; and in the field of power transmission, it can effectively solve the disadvantages of cable lines in terms of long distance, high weight and long-term suspension deformation.

[0024] (3) The longitudinal tensile strength of the continuous alumina fiber reinforced metal matrix composite core wire prepared by the present invention can reach 1.5 to 1.9 GPa, the longitudinal elastic modulus can reach 200 to 260 GPa, and the longitudinal thermal expansion coefficient is only 5 ppm / ℃. It has good comprehensive mechanical and physical properties.

[0025] (4) In this invention, molten aluminum flows into the bonding cavity through the gap between the inner wall of the leak and the outer wall of the guide tube via an insulated pipe, and wraps the alumina fiber yarn that passes through the bottom of the guide tube to form an alumina fiber reinforced metal matrix composite core wire. The structure is simple and easy to use. It avoids the fiber breakage problem caused by the traditional preparation method of placing alumina fibers in molten metal for direct stretching. By setting a guide tube in the leak, the yarn is led out from the lower end of the guide tube, and the molten aluminum (molten metal) is led out from the gap between the inner wall of the leak and the outer wall of the guide tube. The molten aluminum can be uniformly coated on the outer periphery of the yarn to obtain a uniformly fine alumina fiber reinforced metal matrix composite wire with excellent performance.

[0026] (5) The present invention combines the introduction of nitrogen into the cavity to prevent oxidation of aluminum before solidification; nitrogen is also introduced into the furnace to prevent oxidation of aluminum.

[0027] (6) The insulated pipe of the present invention is equipped with valves and pressure gauges. The capacity and flow rate of the molten aluminum in the insulated pipe can be observed and adjusted at any time through the valves and pressure gauges. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the continuous alumina fiber reinforced metal matrix composite sheath core wire preparation device of the present invention;

[0029] Figure 2 This is a schematic cross-sectional view of the continuous alumina fiber reinforced metal matrix composite core wire prepared according to the present invention.

[0030] The components include: 1. Unwinder; 2. Yarn; 3. Traction machine; 4. Yarn guide tube; 5. Extruder; 6. Connecting cavity; 7. Alumina fiber reinforced metal matrix composite core wire; 8. Winding machine; 9. Pressure gauge; 10. Valve; 11. Insulated pipe; 12. Furnace; 13. Aluminum layer; 14. Alumina fiber yarn layer. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] Test method:

[0035] Tensile strength test: conducted on an Instron 3385H universal testing machine, with a tensile speed set to 2 mm / min;

[0036] Elastic modulus test: The elastic modulus is tested on a three-point bending tester by measuring the relationship between stress and strain.

[0037] Thermal expansion coefficient test: The test is conducted on a static thermomechanical analysis (TMA) instrument and the thermal expansion coefficient is measured by temperature-deformation curve.

[0038] Example 1

[0039] like Figure 1 and 2 As shown, this embodiment provides a continuous alumina fiber reinforced metal matrix composite core wire preparation device, including an unwinding machine 1, an insulated pipe 11, a traction machine 3, and a winding machine 8. One end of the insulated pipe 11 is connected to a furnace 12, and the other end is provided with a nozzle 5. A connecting cavity 6 is provided below the nozzle 5. The nozzle 5 is inserted into the connecting cavity 6. A yarn guide tube 4 is provided inside the nozzle 5. A yarn 2 is wound on the unwinding machine 1. The yarn 2 is pulled by the traction machine 3 and passes into the yarn guide tube 4, and then passes out from the bottom of the yarn guide tube 4 and is wound onto the winding machine 8.

[0040] Optionally, the unwinder 1, the traction machine 3, and the winding machine 8 are all rollers.

[0041] Furthermore, the cross-section of the leak nozzle 5 is an inverted triangle with the opening facing downwards. The leak nozzle 5 is connected to the furnace 12 through the heat-insulating pipe 11, and there is a gap between the inner wall of the leak nozzle 5 and the outer wall of the yarn guide tube 4.

[0042] Further, the yarn 1 is an alumina fiber yarn. Optionally, the alumina fiber yarn is Akabane alumina continuous fiber with a fineness ranging from 55-400 Tex, more preferably 125 Tex. Optionally, the alumina fiber yarn is a fiber yarn obtained by twisting 5-10 alumina fibers, with a twist of 40-80 twists / meter.

[0043] Furthermore, molten aluminum is provided inside the furnace 12. The molten aluminum flows into the connecting cavity 6 through the gap between the inner wall of the nozzle 5 and the outer wall of the yarn guide tube 4 via the heat insulation pipe 11, and wraps the alumina fiber yarn that passes through the bottom of the yarn guide tube 4 to form an alumina fiber reinforced metal matrix composite core wire 7. The inner core of the alumina fiber reinforced metal matrix composite core wire 7 is an alumina fiber yarn layer 14, and the alumina fiber yarn layer 14 is covered with an aluminum layer 13.

[0044] Furthermore, nitrogen gas is introduced into the bonding cavity 6 to prevent oxidation of the molten aluminum before solidification; nitrogen gas is also introduced into the furnace 12 to prevent oxidation of the aluminum.

[0045] Furthermore, the bonding cavity 6 is also externally connected to a cold air mechanism, through which cold air is introduced into the bonding cavity 6 to accelerate the solidification of molten aluminum and make it firmly cover the outside of the alumina fiber yarn.

[0046] Furthermore, a filter device is also provided inside the furnace 12 to filter the alumina residue inside the furnace 12 and prevent it from flowing into the insulation pipe 11. Optionally, the filter device is a filter screen.

[0047] Furthermore, the insulation pipe 11 is equipped with a valve 10 and a pressure gauge 9, which allows for the observation and adjustment of the volume and flow rate of molten aluminum in the insulation pipe 11 at any time; optionally, the valve 10 is a solenoid valve or an electric valve.

[0048] The working principle of this embodiment is as follows: Nitrogen gas is introduced into the furnace 12, and then aluminum blocks are placed into the furnace 12 to melt into molten aluminum. After being filtered by the filter device, the molten aluminum flows into the connecting cavity 6 through the gap between the inner wall of the leak 5 and the outer wall of the yarn guide tube 4 via the heat insulation pipe 11. The pressure of the heat insulation pipe 11 is adjusted in real time by the valve 10.

[0049] The yarn 2 is drawn into the yarn guide tube 4 by the traction machine 3, and exits from the bottom of the yarn guide tube 4 and the nozzle 5 into the connecting cavity 6. The connecting cavity 6 is pre-filled with nitrogen and cold air. When the molten aluminum and the yarn 2 arrive at the connecting cavity 6 simultaneously, the molten aluminum wraps the alumina fiber yarn inside, and then it is wound into shape by the winding machine 8, ultimately resulting in a continuous alumina fiber reinforced metal matrix composite core wire 7 (e.g., with an alumina fiber yarn layer 14 as the inner core and an aluminum layer 13 covering the outer layer of the alumina fiber yarn layer 14). Figure 2 (As shown).

[0050] Example 2

[0051] A method for preparing continuous alumina fiber reinforced metal matrix composite core wire, using the apparatus for preparing continuous alumina fiber reinforced metal matrix composite core wire provided in Example 1, includes the following steps:

[0052] (1) First, adjust the furnace temperature to 750℃, adjust the insulation pipe temperature to 670℃, and fill the furnace with nitrogen. Then, put the aluminum block into the furnace to melt into molten aluminum. After filtering, the molten aluminum enters the bonding cavity through the insulation pipe, and the pressure of the insulation pipe is adjusted in real time through the valve.

[0053] (2) The continuous alumina fiber yarn is unwound into the bonding cavity; the fineness of the alumina fiber is 125Tex; the alumina fiber yarn is made of 7 alumina fibers twisted together, with a twist of 60 twists / meter.

[0054] (3) Nitrogen and cold air are pre-filled into the cavity. When the aluminum liquid and yarn arrive at the cavity at the same time, the aluminum liquid wraps the yarn inside and then winds it into shape by a winding machine to finally obtain a continuous alumina fiber reinforced metal matrix composite core wire.

[0055] Tests revealed that the continuous alumina fiber reinforced metal matrix composite core wire prepared in Example 2 had a good surface and uniform thickness. Its longitudinal tensile strength was 1.8 GPa, longitudinal elastic modulus was 250 GPa, and longitudinal thermal expansion coefficient was 6.0 ppm / ℃.

[0056] Comparative Example 1

[0057] Nitrogen charging in step (1) of Example 2 was omitted, while everything else remained the same as in Example 2, resulting in a continuous alumina fiber reinforced metal matrix composite core wire.

[0058] Tests revealed that the continuous alumina fiber reinforced metal matrix composite core wire prepared in Comparative Example 1 had an intact surface and uniform thickness. Its longitudinal tensile strength was 1.2 GPa, longitudinal elastic modulus was 199 GPa, and longitudinal thermal expansion coefficient was 5.7 ppm / ℃. This is because the oxidation of aluminum to form alumina increases the brittleness of the material.

[0059] Comparative Example 2

[0060] Adjust the furnace temperature in step (1) of Example 2 to 660°C, and keep the other conditions the same as in Example 2 to obtain a continuous alumina fiber reinforced metal matrix composite core wire.

[0061] Tests revealed that the surface of the continuous alumina fiber reinforced metal matrix composite core wire prepared in Comparative Example 2 was slightly rough, but the thickness was uniform. Its longitudinal tensile strength was measured to be 1.6 GPa, longitudinal elastic modulus to be 237 GPa, and longitudinal thermal expansion coefficient to be 6.6 ppm / ℃. This is because the aluminum block could not be completely melted into molten aluminum with good fluidity at 660℃, which resulted in the molten aluminum not being able to coat the surface of the alumina fiber yarn well.

[0062] Comparative Example 3

[0063] The filtration of molten aluminum in step (1) of Example 2 was omitted, while everything else remained the same as in Example 2, to obtain a continuous alumina fiber reinforced metal matrix composite core wire.

[0064] Tests revealed that the continuous alumina fiber reinforced metal matrix composite core wire prepared in Comparative Example 3 had a rough surface and uneven thickness. Its longitudinal tensile strength was 1.6 GPa, longitudinal elastic modulus was 242 GPa, and longitudinal thermal expansion coefficient was 6.2 ppm / ℃. This is because the molten aluminum that was not filtered may contain particulate impurities.

[0065] Comparative Example 4

[0066] The regulating valve in step (1) of Example 2 is removed, and everything else remains the same as in Example 2, to obtain a continuous alumina fiber reinforced metal matrix composite core wire.

[0067] Tests revealed that the surface of the continuous alumina fiber reinforced metal matrix composite core wire prepared in Comparative Example 4 was intact, but the thickness was uneven. The average longitudinal tensile strength was 1.6 GPa, the average longitudinal elastic modulus was 239 GPa, and the average longitudinal thermal expansion coefficient was 6.6 ppm / ℃. This was because the volume and flow rate of molten aluminum in the insulation pipe could not be adjusted in real time through the valve, which prevented the molten aluminum from being evenly wrapped around the alumina yarn.

[0068] Comparative Example 5

[0069] The twisting in step (2) of Example 2 is cancelled, and the seven fibers are placed side by side into the bonding cavity. Everything else remains the same as in Example 2 to obtain a continuous alumina fiber reinforced metal matrix composite core wire.

[0070] Tests revealed that the continuous alumina fiber reinforced metal matrix composite core wire prepared in Comparative Example 5 had an intact surface and uniform thickness. Its longitudinal tensile strength was measured to be 1.1 GPa, longitudinal elastic modulus to be 216 GPa, and longitudinal thermal expansion coefficient to be 6.2 ppm / ℃. This is because the fibers were not twisted into yarn, the bonds between individual fibers were loose, and the molten aluminum directly penetrated into each fiber to form a strong interfacial bond.

[0071] Comparative Example 6

[0072] Adjust the number of alumina fibers in step (2) of Example 2 to 5, while keeping the other steps the same as in Example 2, to obtain a continuous alumina fiber reinforced metal matrix composite core wire.

[0073] Tests revealed that the continuous alumina fiber reinforced metal matrix composite core wire prepared in Comparative Example 6 had an intact surface and uniform thickness. Its longitudinal tensile strength was 1.5 GPa, longitudinal elastic modulus was 226 GPa, and longitudinal thermal expansion coefficient was 6.1 ppm / ℃. This is because the reduction in the number of fibers could not provide sufficient reinforcing strength for the composite core wire.

[0074] Comparative Example 7

[0075] Adjust the twist in step (2) of Example 2 to 90 twists / meter, and keep the other settings the same as in Example 2 to obtain a continuous alumina fiber reinforced metal matrix composite core wire.

[0076] Tests revealed that the continuous alumina fiber reinforced metal matrix composite core wire prepared in Comparative Example 7 had an intact surface and uniform thickness. Its longitudinal tensile strength was 1.3 GPa, longitudinal elastic modulus was 224 GPa, and longitudinal thermal expansion coefficient was 6.1 ppm / ℃. This was because the twist was too large, causing the fiber to be in a taut state.

[0077] Comparative Example 8

[0078] Nitrogen filling in step (3) of Example 2 is omitted, while everything else remains the same as in Example 2, to obtain a continuous alumina fiber reinforced metal matrix composite core wire.

[0079] Tests revealed that the continuous alumina fiber reinforced metal matrix composite core wire prepared in Comparative Example 8 had an intact surface and uniform thickness. Its longitudinal tensile strength was 1.2 GPa, longitudinal elastic modulus was 226 GPa, and longitudinal thermal expansion coefficient was 5.6 ppm / ℃. This is because the oxidation of aluminum to form alumina increases the brittleness of the material.

[0080] Comparative Example 9

[0081] The cold air injection in step (3) of Example 2 is cancelled, and everything else remains the same as in Example 2, to obtain a continuous alumina fiber reinforced metal matrix composite core wire.

[0082] Tests revealed that the continuous alumina fiber reinforced metal matrix composite core wire prepared in Comparative Example 9 had an intact surface and uniform thickness. Its longitudinal tensile strength was 1.3 GPa, longitudinal elastic modulus was 228 GPa, and longitudinal thermal expansion coefficient was 6.4 ppm / ℃. This is because, without cooling air, molten aluminum could not solidify completely on the surface of the alumina fiber yarn in a timely manner.

[0083] The continuous alumina fiber reinforced metal matrix composite sheath core wires obtained in Example 2 and Comparative Examples 1-9 were subjected to performance tests, and the test results are summarized in Table 1:

[0084] Table 1. Performance test results of continuous alumina fiber reinforced metal matrix composite cored wires obtained in Example 2 and Comparative Examples 1-9.

[0085]

[0086]

[0087] As can be seen from Table 1, the continuous alumina fiber reinforced metal matrix composite core wire prepared in Example 2 has the best comprehensive mechanical and physical properties.

[0088] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A continuous alumina fiber reinforced metal matrix composite sheath-core wire preparation device, characterized in that, The device includes an unwinding machine, an insulated pipe, a traction machine, and a winding machine. One end of the insulated pipe is connected to a furnace, and the other end is provided with a nozzle. A connecting cavity is provided below the nozzle, and the nozzle is inserted into the connecting cavity. A yarn guide tube is provided inside the nozzle. Yarn is wound on the unwinding machine. The yarn is pulled by the traction machine and passes through the yarn guide tube, and then passes out from the bottom of the yarn guide tube and is wound onto the winding machine. The cross-section of the leak nozzle is an inverted triangle with the opening facing downwards. The leak nozzle is connected to the furnace through an insulated pipe, and there is a gap between the inner wall of the leak nozzle and the outer wall of the yarn guide tube. The yarn is alumina fiber yarn; molten aluminum is provided in the furnace, and the molten aluminum flows into the bonding cavity through the gap between the inner wall of the nozzle and the outer wall of the yarn guide tube via the heat-insulating pipe, and wraps the alumina fiber yarn that passes through the bottom of the yarn guide tube to form an alumina fiber reinforced metal matrix composite core wire; the inner core of the alumina fiber reinforced metal matrix composite core wire is an alumina fiber yarn layer, and the alumina fiber yarn layer is covered with an aluminum layer; Nitrogen gas is introduced into the bonding cavity and the furnace; a cooling air mechanism is also connected to the bonding cavity; a filter device is also installed in the furnace; valves and pressure gauges are installed on the heat-insulating pipes, and the valves are solenoid valves or electric valves; the unwinding machine, traction machine and winding machine are all rollers.

2. A method for preparing a continuous alumina fiber reinforced metal matrix composite core wire, characterized in that, The method employs the continuous alumina fiber reinforced metal matrix composite sheath core wire preparation apparatus as described in claim 1, and includes the following steps: (1) The aluminum block is melted into molten aluminum in a furnace, and the molten aluminum is filtered and then enters the bonding cavity through an insulated pipe; (2) The continuous alumina fiber yarn enters the bonding cavity through unwinding; (3) Nitrogen gas is introduced into the cavity, and the aluminum liquid wraps the yarn inside. Finally, it is wound into shape by a winding machine. The temperature of the furnace mentioned in step (1) is 750℃; in order to prevent the molten aluminum from solidifying again in step (1), the temperature of the insulation pipe is >660.4℃; Nitrogen gas is introduced into the furnace in step (1) to prevent the oxidation of aluminum; The alumina fiber mentioned in step (2) is Akabane alumina continuous fiber with a fineness ranging from 55 to 400 Tex; the alumina fiber yarn mentioned in step (2) is a fiber yarn obtained by twisting 5 to 10 alumina fibers, with a twist of 40 to 80 twists / meter. Nitrogen gas is introduced into the bonding cavity in step (3) to prevent oxidation of the molten aluminum before solidification; cold air is introduced into the bonding cavity in step (3) to accelerate the solidification of the molten aluminum and make it firmly cover the outside of the alumina fiber yarn.

3. The application of the continuous alumina fiber reinforced metal matrix composite core wire prepared by the apparatus for preparing continuous alumina fiber reinforced metal matrix composite core wire according to claim 1 or the method for preparing continuous alumina fiber reinforced metal matrix composite core wire according to claim 2 in the field of power transmission.

Images