Preparation method of in-situ particle reinforced metal-based composite material

Abstract

The invention discloses a preparation method of an in-situ particle reinforced metal matrix composite, and belongs to the field of powder metallurgy. Titanium powder, a reinforcing body X and a binding agent M are evenly mixed according to a certain proportion, after pressing forming is conducted, the two-step sintering technology of nitrogen sintering and high-temperature sintering is adopted, and the high-performance in-situ particle reinforced metal-based composite material is obtained. In the method, fine and uniform TiC, TiB, TiN or Ti (C, N) strengthening phase particles are generated by utilizing in-situ reaction between titanium powder and nitrogen, C, B or B4C. And meanwhile, Fe, Ni and Co serve as binders to increase wettability between a strengthening phase and a binding phase, metallurgical bonding of strengthening particles and a metal matrix is achieved, and therefore the toughness of the metal matrix composite is improved, full compactness is achieved, and residual pores are eliminated. The metal-based composite material is prepared through the powder metallurgy process, in-situ particle strengthening can be achieved, the process is simple, the raw material utilization rate is high, the material shape is complex and changeable, the production efficiency is high, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and provides a preparation method of in-situ particle reinforced metal matrix composite material. Background technique [0002] In recent years, with the rapid development of modern manufacturing industry, metal matrix composites have become an indispensable new material. In metal matrix composites, the metal matrix is ​​used as the matrix, TiB, TiB 2 , Ti(C,N), B 4 C, TiN and Si 3 N 4 and other ceramic particles as a strengthening phase. Among them, ceramic particles such as TiN, TiC, TiB and Ti(C,N) have the advantages of high melting point, high hardness, good corrosion resistance and oxidation resistance, and have good thermal conductivity, electrical conductivity and chemical stability. Many fields such as tooling, mold making and aerospace. Generally, TiN, TiC, TiB and Ti(C,N) ceramic particles are prepared by high-temperature solid solution method, high-temperature nitriding method, s...

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Problems solved by technology

Generally, TiN, TiC, TiB and Ti(C,N) ceramic particles are prepared by high-temperature solid solution method, high-temperature nitriding method, sol-gel method, ammonolysis method, high-temperature self-propagating reaction method, high-energy ball milling method and in-situ synthesis method. Among them, the in-situ synthesis method can effectively solve the interface reaction between the reinforcement material and the matrix, thereby improving the hardness, strength, wear resistance, creep resistance and high cycle fatigue resistance of the material, while maintaining the surface of the reinforcement without pollution, but in the preparation process, there is still a high melting point, and a high sintering temperature is required to provide the driving force for sintering, resulting in problems such as coarse grains, uneven structure, non-dense sintering, or component segregation.