Extra-coarse crystal grain carbide alloy material used for cutting pick or road excavation teeth, and its preparation method

Abstract

The invention relates to an extra-coarse crystal grain carbide alloy material used for cutting picks or road excavation teeth, and its preparation method, which comprises the following components by weight: 82 to 94.9% of tungsten carbide, 5 to 16% of cobalt, 0.05 to 1.0% of TiC and 0.05 to 1.0 % of NbC. The preparation method comprises the following steps: Co powder, WC powder, TiC powder and NbC powder are selected according to a ratio, acetone is taken as a ball milling medium for wet grinding after configuring the raw materials, a mixture is prepared after drying, a compression molding isperformed, sintering is carried out under the temperature range of 1400 to 1500 DEG C and the extra-coarse crystal grain carbide alloy material is prepared. The mean grain size of WC in alloy reaches5.0 to 10.0 mum, which is obviously higher than the WC grain size of the medium coarse crystal grain alloy, so that the toughness of alloy can be raised; simultaneously, a proper amount of TiC and NbC is added for generating a third microscopic structure phase besides WC and Co, which improves a bonding phase structure and an intercrystalline microstructure, raises wear resistance, impact resistance and hot deformation resistance of the alloy, and substantially increases the comprehensive performances of the alloy.

Description

technical field [0001] The invention relates to an ultra-coarse-grain cemented carbide material used for cutting teeth or cutting teeth and a preparation method thereof. Background technique [0002] The pick is a tool installed on the working mechanism of the coal shearer and the roadheader for cutting coal or rock, and the cutting function is the alloy body welded on the head of the pick. China is a large coal country, with an annual consumption of 8-9 million picks of various types, including about 5-6 million pick-shaped picks, equivalent to about 400-480 tons of hard alloy. In the past, the cobalt content of commonly used materials for tooth pick alloys was generally 11-13%, the grain size was 2-3 μm, and the hardness was HRA 87.0-87.8. The above common alloys are prone to broken teeth when cutting more coal gangue and rock formations, and the service life is relatively low. In addition, although the alloy with a content of 15% or more can solve the problem of broken ...

AI Technical Summary

Problems solved by technology

The above common alloys are prone to broken teeth when cutting coal gangue and rock formations, and the service life is low

In addition, although the alloy with a content of 15% or more can solve the problem of broken teeth, because the tooth head can generate a high temperature of 600-800°C when the pick is working, the large thermal stress will cause cracks in the alloy, which will eventually lead to the alloy falling off and fail