Preparation method of NiAl/WC composite with high-temperature wear resistance

Abstract

The invention provides a NiAl / WC composite with the high-temperature wear resistance and a preparation method of the composite. The composite is prepared from raw materials including Ni powder, Al powder and WC powder; the mole ratio of the Ni powder to the Al powder is 1:1; the mass of the WC powder accounts for 5wt%-40wt% of the total mass of Ni-Al-WC mixed powder; the Ni powder has the particle size ranging from 100 meshes to 300 meshes and the purity ranging from 95%-99.5%; the Al powder has the particle size ranging from 100 meshes to 300 meshes and the purity ranging from 95%-99.5%; and the WC powder has the particle size ranging from 100 meshes to 300 meshes and the purity ranging from 95%-99.5%. With the preparation method, high-temperature sintering is not required, so that the obtained composite is uniform in structure, free of pores and high in stability.

Description

technical field [0001] The invention belongs to the field of material science and technology, and mainly relates to a method for preparing a nickel-aluminum-tungsten carbide (NiAl / WC) composite material by adopting a thermal explosion synthesis auxiliary pressurization process. Background technique [0002] Nickel-aluminum (NiAl) intermetallic compounds have excellent high-temperature comprehensive performance, high melting point and low density, and can be widely used in aerospace and electric boiler fields that require high-temperature performance of materials. However, NiAl intermetallic compounds have poor high-temperature wear resistance and cannot be used under high-temperature and large-load contact friction conditions. [0003] At present, the application of nickel-aluminum-tungsten carbide (NiAl / WC) composite materials in China is mainly concentrated in cemented carbide, which is prepared by thermal explosion synthesis or high-temperature sintering. The research an...

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Problems solved by technology

[0006] However, the sintering reaction method requires the raw materials to undergo a compound reaction, which seriously affects the shrinkage and density of the alloy, and will generate holes in the composite material;

[0007] The intermetallic compound pre-alloying method is to prepare NiAl intermetallic compound pre-alloy powder first, and the aggregate structure will be formed when preparing the intermetallic compound pre-alloy powder, resulting in poor uniformity of binder phase distribution and low compositional stability. It needs to go through two sintering steps, the steps are complicated, the material preparation time is long, and the energy consumption is high

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