Method for preparing SiCpAl composite material

Abstract

The invention relates to the technical field of preparation of rare metal materials, and concretely relates to a method for preparing a SiCp / Al composite material. The method for preparing the SiCp / Al composite material comprises the following steps: 1, preparing SiC-Al composite powder: filing a ball milling pot with SiC powder and Al powder, and carrying out ball milling according to a ball to powder ratio of 20:1 to obtain the SiC-Al composite powder; and 2, preparing a cast body: heating pure aluminum ingots to melt the pure aluminum ingots, degassing the molten pure aluminum ingots, removing slag from the degassed molten pure aluminum ingots, adding the ball-milled composite powder, stirring above materials, heating the obtained mixture to 700DEG C, and carrying out cast molding 20min later. The method for preparing high-performance composite powder by adopting a powder metallurgy technology avoids the problems of poor wettability of a reinforcement material and a matrix and poor dispersibility of ultrafine particles of traditional stirring dispersion methods by uniformly dispersing silicon carbide ultra-micro fine particles difficultly uniformly dispersed in aluminum melt in large aluminum particles, and is in favor of displaying the advantages of low cost and shape diversification of the prepared material of stirring casting methods.

Description

technical field [0001] The invention relates to the technical field of preparation of rare metal materials, in particular to a method for preparing SiCp / Al composite materials. Background technique [0002] Aluminum matrix composites reinforced with silicon carbide particles have excellent properties such as high specific strength, high specific stiffness, small thermal expansion coefficient, and good thermal conductivity, and can be processed twice with traditional processing equipment, and the preparation and processing costs are low. One of the materials with the most research and the widest potential application prospects, it has a development history of more than 30 years. At present, the main preparation processes of silicon carbide particle reinforcement include powder metallurgy, stirring casting, spray deposition, pressure infiltration and other processes. The distribution uniformity and interfacial bonding of the silicon carbide particle reinforcements of the comp...

AI Technical Summary

Problems solved by technology

The poor wettability of reinforcing materials and matrix and poor dispersion of ultrafine particles in the traditional stirring and dispersion method have always been problems that need to be solved.