High-performance metal-matrix composite preparation method

A copper-based composite material and technology of composite materials, applied in the field of powder metallurgy, can solve the problems of destroying the interface stability of composite materials, complex preparation process of composite materials, low interface wettability, etc., achieving high density, wide application range, good interface

Active Publication Date: 2015-09-16
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, ceramic phases and amorphous phases can be used as traditional strengthening phases to improve the strength of metal materials, but they have the following disadvantages: 1. The ceramic strengthening phase is a non-metallic material, and the interface between the strengthening phase and the matrix is ​​moist. Low wettability, poor sintering performance, large porosity, etc., lead to complex preparation process of composite materials; 2. The interface between amorphous strengthening phase and matrix is ​​more difficult to control than traditional crystalline composite materials, amorphous is an unstable state, Under high temperature conditions, amorphous is also prone to crystallization, which destroys the interface stability of composite materials, so amorphous is only suitable for aluminum and magnesium-based composite materials with low melting points

Method used

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Experimental program
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Effect test

Embodiment 1

[0043] Take granular raw materials Al, Fe, Cr, Co and Ni metal powder, the weight ratio is: Al is 4.809g, Fe is 9.955g, Cr is 9.269g, Co is 10.500g, and Ni is 10.460g. For example, the above raw materials Al, Fe, Cr, Co and Ni are metal powders with a purity of 99.5% and a particle size of 200 mesh respectively;

[0044] The AlFeCrCoNi high-entropy alloy powder is prepared by a ball mill under the protection of an argon atmosphere with a rotation speed of 300 rpm, a ball-to-material ratio of 15:1 or 10:1, and ball milling for 60 hours. In addition, n-heptane process control agent can be added to prevent particle agglomeration caused by cold welding;

[0045]Weighing the pure copper powder with a weight of 32g and a particle size of 200 mesh, and the high-entropy alloy powder with a weight of 8g;

[0046] The high-entropy alloy powder and the pure copper powder were ball milled for 4 hours under the protection of an argon atmosphere at a speed of 250 rpm to obtain a composite ...

Embodiment 2

[0051] Take block-shaped raw materials Al, Fe, Cr, Co and Ni, and the weight ratio is: 3.206g for Al, 6.636g for Fe, 6.180g for Cr, 7.000g for Co, and 6.970g for Ni. For example, the above-mentioned raw materials Al, Fe, Cr, Co and Ni have a purity of 99.9% respectively;

[0052] Put the above-mentioned raw materials Al, Fe, Cr, Co and Ni into the copper mold crucible of the electric arc melting furnace, and evacuate to 510 -3 MPa, filled with argon to -0.05MPa;

[0053] Carry out vacuum melting, the melting current is 250A, the electromagnetic stirring current is 10A, the melting time is 1 minute, after repeated flipping and melting for 6 times, cool to room temperature, and take out the AlFeCrCoNi high-entropy alloy;

[0054] Cutting the AlFeCrCoNi high-entropy alloy wire into 1 mm thick flakes, and after ultrasonic cleaning with acetone, crushing the flakes into granules;

[0055] The AlFeCrCoNi high-entropy alloy particles were further pulverized by ball milling with bal...

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Abstract

The invention provides a high-performance metal-matrix composite preparation method. The method comprises steps: granular raw materials: Al, Fe, Cr, Co and Ni metal powder are acquired; under argon atmosphere protection, a high-entropy alloy powder body is prepared via a ball mill; a pure copper powder body and the high-entropy alloy powder body are weighed; the two are subjected to ball milling and mixing under the argon atmosphere protection, and composite powder is obtained; the composite powder is put in a cold pressing grinding tool, uniform pressurization is carried out, and after packing, a cold pressing green body is taken; the composite after cold pressing is put in a graphite grinding tool of an atmosphere protection sintering furnace, temperature rises to 800 DEG C, hot pressing is carried out and packing is carried out for one hour after temperature of the furnace is stable, and circulating nitrogen is provided during the whole process; and when the furnace is cooled to the room temperature, the copper-matrix composite is obtained. Compared with the prior art, by adopting the above preparation method, the high-entropy alloy and the metal matrix have good mutual dissolution and diffusion performance, the preparation process is simple, the high-entropy alloy has good hot stability, the composite has high density, the interface is good, and the mechanical performance is excellent.

Description

technical field [0001] The invention relates to a composite material preparation technology in the field of powder metallurgy, in particular to a method for preparing a high-performance metal matrix composite material. Background technique [0002] Metal matrix composites are widely used in aviation, aerospace, military and automotive industries. However, in some fields, it is difficult to meet people's requirements in terms of technology and performance. Therefore, the development of new high-performance metal materials is an urgent problem to be solved. [0003] In the prior art, ceramic phases and amorphous phases can be used as traditional strengthening phases to improve the strength of metal materials, but they have the following disadvantages: 1. The ceramic strengthening phase is a non-metallic material, and the interface between the strengthening phase and the matrix is ​​moist. Low wettability, poor sintering performance, large porosity, etc., lead to complex prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C9/00C22C30/00
Inventor 陈建魏婷范新华刘赟姿马晓光严文
Owner XIAN TECHNOLOGICAL UNIV
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