Coarse grain hard alloy material and preparation method thereof

Abstract

The invention discloses a coarse grain hard alloy material and a preparation method thereof. The coarse grain hard alloy material is characterized in that high-carbon WC (wolfram carbide) of 6.0-10.0 microns is adopted, and a total carbon content of WC is controlled to a mass percentage of 6.13 wt%-(1-9)%*mass percentage content of Co, meanwhile, 0.4-1.0 wt% of nano-TiC is added. By utilizing free carbon distributed in the high-carbon WC in situ and nano-TiC dispersed nearby the high-carbon WC as dual inducer, a (0001) basal plane of WC grain in the hard alloy is preferentially grown in a sintering process. According to the preparation method of the coarse grain hard alloy material provided by the invention, independence on the crude particle WC raw materials can be avoided, the process is simple to control, the coarse grain hard alloy with good intensity, hardness and wear resistance is obtained by preferential growth of the WC grain, and the preparation method can be used in the field of geological and mining tools, wear-resistant parts and the like.

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.