Process for preparing metal-based ceramic composite material through secondary pressure application

Abstract

The invention relates to a process for preparing a metal-based ceramic composite material through secondary pressure application. A device used in the process comprises a product forming die assembly, a cover die, a bottom plate, a press ejector rod, a workbench and a secondary pressurizing base plate, the workbench is installed on a press, the cover die is installed on the upper surface of the workbench in a matched mode, the bottom plate is matched with the middle of the cover die, the product forming die assembly is arranged on the bottom plate, the bottom face of the bottom plate abuts against the press ejector rod, the press ejector rod penetrates through the workbench, and the bottom plate and the product forming die assembly are controlled to move up and down in a cavity of the cover die through lifting of the press ejector rod. Powder is directly filled into the product forming die assembly, so that the preparation process of a prefabricated part is omitted; in the process of die-casting and metal cementation, a metal core part which is gradually solidified is subjected to secondary pressure application; and the prepared composite material is high in compactness and low in 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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