Device and method for preparing metal matrix composite by adopting high-pressure gas to assist infiltration

Abstract

The invention relates to a device and a method for preparing a metal matrix composite by adopting high-pressure gas to assist infiltration, and the device is formed by mutually connecting four major function systems, namely a vacuum system, a gas distribution system, a pressurizing and gas charging system and a preparation system; and the preparation method adopting the device is as follows: applying the high-pressure gas to provide pressure, driving melting matrix molten metal to effectively fill pores of a second phase or a perform and cooling so as to finally get the composite. By adopting the device and the method, structural defects can be significantly eliminated, effective control of the structure of an interface between two phases is realized through heat-keeping and pressure-keeping treatment, the performances of the composite are improved, taking the Al / diamond composite as an example, the thermal conductivity can achieve 649W / mK; through reasonable design of components of the high-pressure gas, the problems in preparation of the special metal matrix composite can be solved, and the preparation quality of the composite, including activity of matrix metal Mg, high-temperature graphitization problem of a diamond and the like, is improved; near-net-shape forming of parts in complex shapes, which are made of a large number of types of the metal matrix composites can be realized; and the preparation quality is high, and the repeatability is strong.

Description

technical field [0001] The invention relates to a metal-matrix composite material preparation device and the technical field, and provides a device and a method for preparing a metal-matrix composite material by high-pressure gas-assisted infiltration. Background technique [0002] Metal matrix composites have excellent comprehensive properties and can meet the higher comprehensive requirements for material performance in aerospace, advanced weapon systems, automobiles and electronics industries. development of. [0003] The main factors affecting the promotion and application of metal matrix composites are material properties and preparation costs. The preparation equipment and methods of composite materials determine these two aspects to a large extent. Therefore, research and development of new and efficient metal matrix composites manufacturing equipment and methods are important issues in the field of composite materials. [0004] The main preparation techniques of me...

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Problems solved by technology

[0007] The pressure infiltration equipment and method adopts a mechanical device to provide one-way pressure, and the metal liquid is impregnated and formed by the pressure head (punch). Due to the sealing defect of mechanical pressing, the metal liquid of the matrix is ​​very likely to occur during the pressure infiltration forming process. Spilling and splashing will cause defects such as pores and looseness in the material, which will affect the quality of the composite material. The violent disturbance of the metal liquid will also have an adverse effect on the distribution of the second phase in the metal matrix. The unevenness of unidirectional pressure will cause local stress concentration in the composite material, which seriously affects the stability and reliability of the prepared composite parts in actual use.

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