Preparation method of nanoscale hard alloy

Abstract

The invention discloses a preparation method of a nanoscale hard alloy. According to the preparation method, the nanoscale hard alloy with a grain size less than 0.4 micrometer is prepared through the procedures of blending, ball-milling, spray-drying, extrusion forming and pressure sintering by taking WC powder with a Fsss particle size less than 0.2 micrometer and Co powder with a Fsss particle size less than 0.8 micrometer as raw materials and vanadium carbide and chromium carbide as inhibitors. The nanoscale hard alloy is integral in metallographic structure, has the characteristics of high hardness, high strength and the like, and can be used for processing a high-hardness material with HRC hardness higher than 60 degrees; in addition, a cutter processed by adopting the nanoscale hard alloy can be prolonged in service life by nearly 30% and increased in cutting speed by 10%.

Description

technical field

[0001] The invention belongs to the technical field of hard alloys, and in particular relates to a preparation method of nanoscale hard alloys. Background technique

[0002] The nano-scale cemented carbide solid cutter is mainly used to process difficult-to-machine materials with HRC hardness >60°, and the diameter of the cutter can be ￠<0.15mm. At present, the domestic processing of high-hardness and extremely micro-diameter cemented carbide solid tools basically relies on imports. The main reason is that nano-scale WC cannot be produced in China, and the production of cemented carbide is difficult, and the cemented carbide material cannot meet the requirements. For processing high-hardness materials, cemented carbide with a grain size of about 0.5 microns is used. The tool and other materials processed have low service life and poor surface finish. Due to the large wear of the tool, the dimensional accuracy of the material can be low. In view of the ...

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