Method for preparing SiC particle reinforced foamed aluminium radical composite material

Abstract

The invention relates to a preparing method for a SiC particle reinforced foam aluminum based composite, which comprises the following procedures: taking by mass among the total alloy amount 1-3% Mg, 6-8% Si and remainder Al, heating 10-20% SiC particles to melt into molten aluminum alloy, carrying out electromagnetic agitating evenly; adding 1-3% foaming agent by mass, after agitating evenly the foaming agent, keeping temperature and foaming 3-5 minutes; cooling after the molten aluminum grows steadily so as to cool and solidify the molten aluminum alloy foam, then getting SiC particle reinforced foam aluminum based composite with even hole structure and high porosity. The method adds molten aluminum alloy SiCp, which on one hand increases the viscosity of the molten alloy so as to prevent the bubbles dissolved from the foaming agent from floating upward and prolong the lives of the bubbles, on another hand, SiCp can also improve the strength of the foam aluminum. These bubbles take SiCp as a core and grow, then are cooled concurrently in all directions, this can overcome any shortcoming in solidifying and get foam aluminum of high porosity and even hole structure. By using electromagnetic agitating, the burning loss in the agitating blade can be avoided, this is useful for controlling the chemical components of the alloy.

Description

technical field [0001] The invention relates to a preparation method of SiC particle reinforced foamed aluminum-based composite material. Background technique [0002] Aluminum foam has both porous structure and metal characteristics, and has become one of the research hotspots in the field of materials due to its excellent physical properties, chemical properties, mechanical properties, multi-functional compatibility and its recyclability. Particle-reinforced metal matrix composites are also a new type of metal material developed in recent years, with high specific strength, specific stiffness, elastic modulus, wear resistance and low thermal expansion coefficient and other excellent properties. If the two are combined into a SiC particle-reinforced aluminum foam matrix composite material, which has the advantages of both materials, it will have a broader application prospect. [0003] Most of the existing stirring methods in the preparation process of SiC particle reinfor...

AI Technical Summary

Problems solved by technology

Although this method is simple and easy to implement, the whole stirring process not only wastes heat energy by exposing the aluminum liquid to the air, but also the stirring paddle is easily corroded in the high-temperature aluminum alloy melt, making the stirring weak; Will cause high cost and low efficiency of production

[0004] In the range of 600-800°C, the contact angle θ between SiC particles and aluminum liquid is about 120°, indicating that the wettability of SiC particles and aluminum liquid is not good. If it is added directly without treatment, it will cause self-agglomeration, resulting in difficulty in compounding. It is easy to form microscopic cavities between grains, and the mechanical properties decrease; the untreated TiH 2 When added to molten aluminum, due to the high temperature of molten aluminum, TiH 2 Bubbles rapidly after adding, making it difficult to obtain a uniform foam material