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A cemented carbide and formula technology, applied in the field of tungsten-cobalt cemented carbide formula, can solve the problems of uniform grain distribution, unenhanced thermal fatigue resistance and wear resistance, difficulty, etc., and achieve obvious wear resistance and heat resistance. The effect of fatigue performance
Inactive Publication Date: 2011-01-26
ZHEJIANG HENGCHENG CEMENTED CARBIDE CO LTD
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[0005] The purpose of the present invention is to provide a tungsten-cobalt cemented carbide formula, which can effectively solve the problem that the existing tungsten-cobalt cemented carbide formula does not strengthen its thermal fatigue resistance and wear resistance, and ensure the grain distribution in each batch of alloys. unanimously difficult problem
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Embodiment 1
[0012] A tungsten-cobalt cemented carbide formula, comprising the following components, the WC powder mass percentage is 92%, the cobalt powder mass percentage is 8%, wherein the coarse particle WC powder accounts for 65% of the WC powder weight, and the fine particle WC accounts for the WC powder. 35% of powder weight, the coarse particle WC powder is 2.2 μm, and the fine particle WC powder is 0.7 μm.
Embodiment 2
[0014] A tungsten-cobalt cemented carbide formula, comprising the following components, the WC powder mass percentage is 90%, the cobalt powder mass percentage is 10%, wherein the coarse particle WC powder accounts for 60% of the WC powder weight, and the fine particle WC accounts for WC powder 40% of the powder weight, the coarse particle WC powder is 2.4 μm, and the fine particle WC powder is 0.6 μm.
Embodiment 3
[0016] A tungsten-cobalt cemented carbide formula, comprising the following components, the WC powder mass percentage is 94%, the cobalt powder mass percentage is 6%, wherein the coarse particle WC powder accounts for 70% of the WC powder weight, and the fine particle WC accounts for WC 30% of the powder weight, the coarse particle WC powder is 2.0 μm, and the fine particle WC powder is 0.8 μm.
[0017] In the above three embodiments, after the various materials are prepared in proportion, they are made into hard powder by wet grinding, unloading, sedimentation, drying and vibrating screen, granulation with forming agent, compression molding, removal of forming agent, and sintering. quality alloy.
[0018] The two indicators of thermal fatigue and wear resistance require a two-way combination of powder grain size ratio and composition ratio to achieve an ideal requirement. Through this cemented carbide product with several ratios, thermal fatigue and wear resistance can be ach...
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Abstract
The invention discloses a formula of a tungstate and cobalt hard alloy and can effectively solve the problem that the conventional formula of the tungstate and cobalt hard alloy does not enhance the thermal fatigue resistance and wear resistance of the tungstate and cobalt hard alloy and has difficulty in ensuring the uniform grain distribution in all ranges in each batch of alloys. The formula of the tungstate and cobalt hard alloy comprises the following components in percentage by mass: 90 to 94 percent of WC powder and 6 to 10 percent of cobalt powder, wherein the WC powder contains 60 to 70 percent of coarse WC powder and 30 to 40 percent of fine WC powder, the particle size of the coarse WC powder ranges from 2.0 to 2.4, and the particle size of the fine WC powder ranges from 0.6 to 0.8 mu m. The formula of a tungstate and cobalt hard alloy has the advantage that the alloy with bimodal size distribution of the WC grains has much higher wear resistance and thermal fatigue resistance and can better meet the requirements for making alloy teeth of roller cutter bits compared with the conventional hard alloys which have uniform or continuous size distribution of the WC grains.
Description
technical field [0001] The invention relates to a tungsten-cobalt cemented carbide formula. Background technique [0002] In cemented carbide, the grain size of WC has a significant impact on the properties of the alloy. Generally speaking, cemented carbide with coarser WC grains has better toughness and thermal fatigue resistance, and finer WC grains Carbide has high wear resistance. In many occasions, such as cemented carbide teeth for roller cone drills, the failure mechanism during use is the result of simultaneous action of thermal fatigue and wear. In order to meet such use occasions, cemented carbide is required to have good thermal fatigue properties and abrasion resistance. [0003] Traditional cemented carbide generally has a uniform structure, which often sacrifices its wear resistance when improving the thermal fatigue resistance of the product; on the contrary, when it is necessary to improve the wear resistance of the product, it must sacrifice its thermal fa...
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