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Fine-grain hard alloy and preparation method thereof

A cemented carbide and fine-grain technology, which is applied in the field of cemented carbide, can solve the problems of poor performance of fine-grained WC-based cemented carbide materials and unsatisfactory effect of grain growth inhibitor, so as to improve the transverse fracture strength. and wear resistance, improve hardness, improve the effect of transverse fracture strength

Active Publication Date: 2021-05-14
广东正信硬质材料技术研发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem that this invention exists is: the effect of the grain growth inhibitor that it uses is unsatisfactory, so the performance of the fine-grained WC base cemented carbide material that makes is not good

Method used

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  • Fine-grain hard alloy and preparation method thereof
  • Fine-grain hard alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Fine-grained cemented carbide, prepared from the following components by weight percentage: 1% grain growth inhibitor, 12% cobalt powder with an average particle size of 1-1.5 μm, and the rest is carbonized powder with an average particle size of 0.2-0.5 μm For tungsten, the weight percentage sum of each component is 100%. Wherein, the grain growth inhibitor is made by the following steps:

[0031] Add niobium oxalate into the DMF ethanol solution and mix uniformly to prepare a solution with a concentration of 0.3mol / L, add chromium nitrate to the DMF ethanol solution and mix uniformly to obtain a solution with a concentration of 0.2mol / L, add rhenium nitrate to DMF ethanol Mix homogeneously in the solution and make concentration be the acetone solution of 0.04mol / L, add 3-phenylacetylacetone in the DMF ethanol solution and mix homogeneously make concentration be the acetone solution of 0.5mol / L, the volume ratio is 1:1: Mix A solution, B solution, C solution, and D so...

Embodiment 2

[0038] Fine-grained cemented carbide, prepared from the following components by weight percentage: 0.9% grain growth inhibitor, 14% cobalt powder with an average particle size of 1-1.5 μm, and the rest being carbonized powder with an average particle size of 0.2-0.5 μm For tungsten, the weight percentage sum of each component is 100%. Wherein, the preparation steps of the grain growth inhibitor are the same as in Example 1.

[0039] The preparation method of the fine-grained hard alloy comprises the following steps:

[0040] S1. Weigh each component by weight percentage, mix each component to obtain alloy powder, add alloy powder, polyoxyethylene octylphenol ether-10, and paraffin into a ball mill, and obtain a mixed slurry after wet ball milling for 24 hours. The ball-to-material ratio during wet ball milling is 5:1, the weight ratio of polyoxyethylene octylphenol ether-10 to alloy powder is 1:5, and the weight ratio of paraffin wax to alloy powder is 1:100;

[0041] S2. Sp...

Embodiment 3

[0045] Fine-grained cemented carbide, prepared from the following components by weight: 1.2% grain growth inhibitor, 10% cobalt powder with an average particle size of 1-1.5 μm, and the rest being carbonized powder with an average particle size of 0.2-0.5 μm For tungsten, the weight percentage sum of each component is 100%. Wherein, the preparation steps of the grain growth inhibitor are the same as in Example 1.

[0046] The preparation method of the fine-grained hard alloy comprises the following steps:

[0047] S1. Weigh each component by weight percentage, mix each component to obtain alloy powder, add alloy powder, polyoxyethylene octylphenol ether-10, and paraffin into a ball mill, and obtain a mixed slurry after wet ball milling for 48 hours. The ball-to-material ratio during wet ball milling is 5:1, the weight ratio of polyoxyethylene octylphenol ether-10 to alloy powder is 1:5, and the weight ratio of paraffin wax to alloy powder is 1:100;

[0048] S2. Spray drying ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10B22F9/04B22F3/16
CPCC22C29/08C22C1/051C22C1/1084B22F9/04B22F3/16B22F2009/043
Inventor 叶惠明叶少良诸优明叶戈
Owner 广东正信硬质材料技术研发有限公司
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