Preparation process of reinforced intragranular aluminum matrix composites with nano ceramic particles added externally

Abstract

The invention relates to reinforced intragranular aluminum matrix composites with nano ceramic particles added externally and a preparation process thereof. According to composites and the preparation process, the problems that particle sizes of nano particle reinforced aluminum matrix composites prepared by an existing in-situ method is hard to be controlled within the nanoscale range and nano particle reinforced aluminum matrix composites prepared by an existing external addition method are grain-boundary type nano particle reinforced aluminum matrix composites and low in strength and plasticity are solved. The preparation process comprises 1, weighing out constituents, and adding stearic acid which accounts for 0.6-8% of the gross mass to conduct ball milling; 2, conducting vacuum hot pressed sintering to form blocks after ball milling; and 3, conducting hot extrusion deformation on blocks to obtain nano ceramic particle reinforced aluminum matrix composites. Composites prepared by the process are high in strength and good in plasticity. Composites and the preparation process are applicable to the field of preparation of aluminum matrix composites.

Description

technical field [0001] The invention relates to a preparation method of a ceramic particle reinforced aluminum matrix composite material. Background technique [0002] Nano-ceramic particles (such as SiC, SiO 2 , MgO, TiB 2 , A1 2 o 3 , Si 3 N 4 and TiC) reinforced aluminum matrix composites are receiving extensive attention and research due to their excellent mechanical properties. Generally, the preparation methods of nanoparticle-reinforced aluminum matrix composites include in-situ method and external method. However, although the in-situ method can obtain the intragranular reinforcement phase, due to the fast reaction speed and high temperature, it is difficult to control the particle size of the in-situ synthesis within the nanometer range, and the in-situ method can only synthesize limited types of ceramics. particles. [0003] Generally speaking, nanoparticles can be distributed inside the crystal grains or on the grain boundaries, and their functions are qui...

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Problems solved by technology

[0004] The present invention aims to solve the problem that the particle size of the nanoparticle-reinforced aluminum-based composite material prepared by the existing in-situ method is difficult to control within the nanoscale range and that the nanoparticle-reinforced aluminum-based composite material prepared by the existing external method is all of the grain boundary type Nanoparticles reinforced aluminum matrix composites have problems of low strength and plasticity, and a method for preparing intragranular aluminum matrix composites reinforced with nanoceramic particles is provided

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