Method for synthesizing in-situ formed ceramic particle reinforced iron-aluminum-based composites by laser combustion

Abstract

The invention discloses a method for synthesizing in-situ formed ceramic particle reinforced iron-aluminum-based composites by laser combustion, belonging to the technical field of materials. The in-situ formed ceramic particle reinforced iron-aluminum-based composites are prepared by the following steps of: putting tungsten ore powder, iron powder, aluminum powder and carbon powder in a ball mill for milling to obtain a mixed powder material; and compressing the mixed powder material into a pressed compact, transmitting a high-energy laser beam by employing a CO2 laser processing machine to ignite the surface of the pressed compact and trigger self-propagating high temperature synthesis of the pressed compact. By the invention, two ceramic particle reinforced phases are simultaneously formed on one substrate, which shortens the preparation process of the composites, lowers material manufacture cost and facilitates large-scale production and application.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for synthesizing in-situ self-generated ceramic particle-reinforced iron-aluminum matrix composite materials by laser combustion. Background technique [0002] In recent years, metal matrix composites (MMCs) have attracted great attention from all over the world because of their special properties such as high specific strength, specific modulus, high temperature resistance, and wear resistance; among them, particle-reinforced metal matrix composites are It has many advantages such as low reinforcement cost, isotropic material properties, low manufacturing cost, large-scale production, and can be processed by traditional metal processing technology, and has become one of the main directions for the development of MMCs. According to the source of the reinforcement, it can be divided into two types: externally introduced reinforcement and in-situ self-generat...

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Problems solved by technology

According to the source of the reinforcement, it can be divided into two types: externally introduced reinforcement and in-situ self-generated reinforcement; there are many preparation methods for metal matrix composites reinforced by externally introduced reinforcement, and the research is also very mature, mainly including squeeze casting, stirring Casting, etc.; the disadvantage of these methods is that there are problems such as poor wettability between reinforcement and matrix, reinforcement contamination, poor bonding or interface embrittlement

However, the disadvantage of SHS technology is that it is extremely difficult to study its mechanism. This is because the temperature of the combustion reaction is extremely high and the speed is extremely fast. The combustion temperature is generally above 1500°C. The expansion rate of the combustion wave is in the range of 1 to 150 mm / s, and the temperature rise rate of the reactants is as high as 10 4 ~10 5 K / s, it is extremely difficult to capture the information of the phase transformation and microstructure transformation process under such high temperature and such fast conditions

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