A mixing method for preparing diamond-reinforced metal matrix composites

Abstract

The invention provides a mixing method for preparation of a diamond enhanced metal matrix composite material and relates to a mixing mode in a process of preparing the diamond enhanced metal matrix composite material, and the method can be used for solving the problem that the thermal conductivity of the prepared diamond enhanced metal matrix composite material is reduced due to the fact that zirconia, alumina and other ceramic materials are adopted as grinding balls in the conventional preparation method of the diamond enhanced metal matrix composite material, and impurities are introduced in the mixing process. The mixing method comprises the following steps: firstly weighing diamond particles and a metal raw material, wherein the metal dosage accounts for 93-97% of the design dosage, the raw material is subjected to wet mixing and ball grinding by use of the grinding balls made of the metal raw material, and the metal matrix material is aluminum or copper. Impurities can be effectively prevented from being introduced by adopting the metal matrix material as the grinding ball material, so that the thermal conductivity of the prepared diamond enhanced metal matrix composite material is remarkably improved by over 39%.

Description

technical field [0001] The invention relates to a mixing method in the process of preparing a diamond-reinforced metal matrix composite material, in particular to a wet ball milling mixing method using metal matrix materials in the composite material as grinding balls, and belongs to the field of electronic packaging. Background technique [0002] Diamond / metal matrix composite material is a new type of thermal management material, and its advantages such as high thermal conductivity, low density and adjustable thermal expansion coefficient make it a hot research topic. The diamond-reinforced composite material prepared by powder metallurgy method has high density, which is the basis for obtaining high thermal conductivity. The powder metallurgy method involves the mixing process. The wet ball milling mixing method can obtain uniformly distributed particles. However, since most of the grinding balls currently used are ceramics such as zirconia and alumina, the metal matrix o...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that ceramic materials such as zirconia and alumina are used as grinding balls in the mixing process of the existing diamond-reinforced metal matrix composite material, and impurities are introduced during the mixing process, resulting in the preparation of diamond-reinforced metal matrix composites. To solve the problem of lower thermal conductivity of composite materials, the invention provides a mixing method for preparing diamond-reinforced metal-matrix composite materials. The metal matrix material is used as the ball material, and the diamond-reinforced metal matrix prepared by wet ball milling is mixed. The thermal conductivity of matrix composites is significantly improved compared to existing methods