Coarse grain hard alloy material and preparation method thereof

Abstract

The invention discloses a coarse-grain cemented carbide material and a preparation method thereof, which is characterized in that high-carbon WC of 6.0-10.0 μm is used and the total carbon content of WC is controlled at 6.13wt%-(1-9)%*Co mass percentage, while adding 0.4-1.0wt% nano-TiC. The free carbon distributed in situ in high-carbon WC and nano-TiC dispersed near high-carbon WC are used as dual inducers to make the (0001) basal plane of WC grains in cemented carbide grow preferentially during sintering. The preparation method of the coarse-grained cemented carbide material of the present invention can avoid dependence on coarse-grained WC raw materials, the process control is simple, and the coarse-grained cemented carbide with good strength, hardness and wear resistance is obtained by utilizing the preferential growth of WC grains , can be used in geological and mining tools, wear-resistant parts and other fields.

Description

technical field [0001] The invention relates to a cemented carbide material and a preparation method thereof, in particular to a cemented carbide material with coarse grains and a preparation method thereof, belonging to the field of cemented carbide materials. Background technique [0002] Cemented carbide is a multi-phase solid material prepared by powder metallurgy method based on refractory transition metal carbides such as WC and iron group metal elements such as Co as binder. Cemented carbide has excellent properties such as high hardness, wear resistance and corrosion resistance, high elastic modulus, and low thermal expansion coefficient. Therefore, cemented carbide is known as "the tooth of industry" and is widely used in cutting tools, geological and mining tools, and Grinding parts and other fields. As a brittle material, cemented carbide has an inherent contradiction between strength and hardness. Generally, the higher the hardness, the lower the strength, and t...

AI Technical Summary

Problems solved by technology

However, the above-mentioned method for producing coarse-grained cemented carbide has the following problems: firstly, it is very difficult to prepare coarse-grained WC raw material powder, especially 20-30 μm coarse-grained WC, and it is difficult to obtain

Second, there are usually a large number of crystal defects such as vacancies and dislocations in coarse-grained WC crystals, so the performance of cemented carbide is reduced

Third, in the process of preparing cemented carbide by powder metallurgy, ball milling will break coarse-grained WC raw materials to a certain extent, so even if coarse-grained WC raw material powders are used, it is easy to obtain coarse-grained hard alloys due to process control problems. alloy

Fourth, the ball milling characteristics and dispersion behavior of coarse-grained WC and fine-grained WC powder are different. In order to improve hardness and wear resistance, adding a certain proportion of fine-grained WC to coarse-grained WC will easily cause uneven dispersion of WC or even WC aggregation.