Method for preparing coarse-grain hard alloy

Abstract

The invention relates to a method for preparing a coarse-grain hard alloy. The method comprises the following steps of: fully mixing the following raw materials in percentage by weight: 93.18 percent of coarse-grain tungsten carbide powder WC, 6 percent of cobalt powder, 0.12 percent of radium powder, 0.2 percent of rhenium powder, 0.1 percent of vanadium carbide, 0.1 percent of chromium carbide, 0.1 percent of tantalum carbide, 0.1 percent of titanium carbide, 0.1 percent of nickel powder and the like; performing wet grinding; drying; and forming, and sintering to obtain the coarse-grain hard alloy. The method is characterized in that: the coarse-grain tungsten carbide powder is not doped with alkali metal ions such as Li, Na, K and the like serving as grain growth agents, and is produced by hydrogen reduction at high temperature, and a production process for the coarse-grain tungsten carbide powder comprises the following steps of: mixing blue tungsten oxide powder and nano carbon black, performing high temperature carbonization, crushing, sieving, blending, detecting, sieving, and packaging to obtain the coarse-grain tungsten carbide powder. The coarse-grain hard alloy is higher in strength and high temperature resistance.

Description

Technical field [0001] The invention relates to the technical field of cemented carbide production, in particular to a preparation method of coarse-grained cemented carbide. Background technique [0002] Coarse-grained cemented carbide has special properties and special uses different from medium and fine-grained cemented carbide, especially coarse-grained cemented carbide has a series of advantages such as less structural defects, high microhardness, and small microscopic strain. Coarse-grained cemented carbide is widely used in mining rock drilling tools, oil drilling tools, stamping dies, wear-resistant and corrosion-resistant parts, high temperature and high pressure resistance, metal pressure processing tools, roll rings for steel rolling, hard surface materials, etc. . [0003] However, in all the reports of coarse-grained hard alloys, the main raw material coarse-grained tungsten carbide powder is doped with alkali metal ions Li, Na, K and other substances as particl...

AI Technical Summary

Problems solved by technology

Coarse-grained cemented carbide produced with these raw materials has poor strength and microhardness matching, and low comprehensive performance, especially the high-temperature strength of the alloy is not high, and the resistance to thermal shock and thermal plastic deformation is not strong, so it is not suitable for high temperature Working in an environment that greatly limits the scope of application of the alloy