Fine-grain hard alloy and preparation method thereof

Abstract

The invention provides a fine-grain hard alloy. The fine-grain hard alloy is prepared from the following components in percentages by weight: 0.9-1.2% of a grain growth inhibitor, 10-14% of cobalt powder and the balance of tungsten carbide, wherein the sum of the weight percentages of the components is 100%. The invention further provides a preparation method of the fine-grain hard alloy. The fine-grain hard alloy provided by the invention uses the grain growth inhibitor with a relatively good effect, so that the fine-grain hard alloy has relatively high mechanical properties.

Description

technical field

[0001] The invention relates to a hard alloy, in particular to a fine-grained hard alloy and a preparation method thereof. Background technique

[0002] Fine-grained cemented carbide is developed on the basis of Gurland's WC-Co alloy strength-cobalt phase mean free path relationship model. Keeping the mean free path at an optimal value, the strength and toughness of WC under tensile stress are significantly increased by refining WC grains. According to this model, the increase in the number of carbide phase grain contacts due to the reduction of the grain size of WC is eliminated by the highly uniform distribution of cobalt, and the hardness is also increased, so that high-performance alloys can be obtained.

[0003] In WC-Co cemented carbide, with the refinement of the original WC and Co powder particles, the WC grains will grow wildly during the sintering process, thus forming discontinuously grown large WC grains in the sintered product. Discontinuous la...

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