A process for preparing metal matrix ceramic composites by secondary pressure

Abstract

The invention relates to a process for preparing metal-based ceramic composite materials by applying secondary pressure, which includes a product forming mold assembly, a sleeve mold, a bottom plate, a press rod, a workbench and a secondary pressure backing plate, and the workbench is installed on On the press, the upper surface of the workbench is equipped with a set mold, and the middle part of the set mold is equipped with a bottom plate. The product forming mold assembly is placed above the bottom plate. The ejector pin of the press is passed through the workbench, and the bottom plate and the product forming mold assembly are controlled to move up and down in the cavity of the mold through the lifting of the press ejector pin; by directly filling the powder into the product forming mold assembly, eliminating The preparation process of the prefabricated part; in the process of die-casting metal infiltration, a second pressure is applied to the gradually solidified metal core; the composite material thus prepared has high density, low porosity, and the quality and performance of the product are greatly improved.

Description

technical field [0001] The invention relates to the technical field of composite material preparation technology, in particular to a technology for preparing metal-based ceramic composite materials by applying secondary pressure. Background technique [0002] In recent years, with the rapid development of science and technology and economy, there is a large demand for lightweight, high thermal conductivity, and low expansion materials, which promotes the rapid development of metal matrix composites. Metal matrix composites have both the properties of metal itself and the comprehensive properties of non-metals, and are far superior to base metals in terms of toughness, wear resistance, heat resistance, heat dissipation, and hardness. [0003] The main reason for preparing metal matrix composites is to improve the thermal conductivity and low expansion properties of metal matrix composites, while improving the tensile strength, proof stress, elastic modulus and heat resistance...

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Problems solved by technology

[0007] In view of the shortcomings in the above-mentioned existing production technology, the applicant provides a process for preparing metal-based ceramic composite materials by applying secondary pressure, so as to strictly control the temperature at which the molten metal is poured into the sleeve mold, so that the molten metal can be melted or semi-solid solution Infiltrate the ceramic particles in the state, avoid the adverse reaction between the molten metal and the ceramic particles at high temperature, and effectively improve the quality of the composite material. Negative pressure is generated in the gap. In addition, after the first holding pressure, in order to avoid the problem that the impregnation rate is not high due to the insufficient holding pressure of the aluminum liquid in the center of the forming mold, the second pressing method of the second pressing plate is adopted. It greatly improves the impregnation rate of molten aluminum, which is more conducive to the full infiltration of molten metal into the gaps of ceramic particles

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