Method for preparing pseudo-crystal granule magnesium base composite material using powder hot-press method

Abstract

The invention relates a powder hot-press method for preparation of sub-crystal granule magnesium composite material, comprising the following steps: preparing the sub-crystal powder with the method of high pressure inactive gas atomization, screening the sub-crystal powder and getting the 20-100um sub-crystal powder, after vacuum heat treatment for 12 hours in the temperature of 850 Deg.C, getting the single sub-crystal phase Al63Cu25Fe12, separate mixing the pure magnesium of -100 mesh and ferro-alloy powder with sub-crystal powder homogeneously, then putting compacting tool set and die in the electrical resistance furnace to keep their temperature, heat pressing and preparing the sub-crystal granule magnesium composite material. The enhancement granule prepared by the invention can be sufficiently mixed with powdered alloy, avoiding the reaction of base molten metal and sub-crystal granule in the process of liquid phase technology because of the low temperature of powder heat pressing. The sub-crystal enhancement granule combines with base metal interface well and disperses in the base metal homogeneously.

Description

technical field [0001] The invention relates to a preparation method in the field of composite materials, in particular to a method for preparing quasicrystalline granular magnesium-based composite materials by powder hot pressing. Background technique [0002] Since the discovery of quasicrystals, more and more attention has been paid to the research and application of quasicrystals. Especially for the research and application of Al-Cu-Fe stable quasicrystals, some achievements have been made. However, no good application examples have been seen at home and abroad for the research on the use of quasicrystalline particles to reinforce magnesium-based composites. The liquid phase preparation process (including stirring casting, pressure infiltration, etc.) will inevitably cause the reaction between the quasicrystalline particles and the matrix metal magnesium, and eventually the quasicrystalline particles will no longer exist, and the original intention of the quasicrystalli...

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Problems solved by technology

However, the process of this method is relatively complicated. The complex process of the ordinary powder metallurgy method leads to the pollution and oxidation of powder particles. In particular, the sintering of magnesium alloys has high requirements for equipment and is required to be carried out under vacuum conditions. Therefore, no matter From the perspective of the preparation of composite materials and the performance of composite materials, the common powder metallurgy method is not very ideal.