High-hardness and high-strength WC-Co-based hard alloy and preparation method thereof and cutting tool

A cemented carbide, high-strength technology, used in other manufacturing equipment/tools, turbines, engine components, etc., can solve the problem of difficulty in improving the strength of alloys, achieve increased strength and hardness, achieve high hardness and high strength performance, and inhibit aggregation. The effect of crystal formation
CN111118376AActive Publication Date: 2020-05-08江西江钨硬质合金有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
江西江钨硬质合金有限公司
Publication Date
2020-05-08

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Abstract

The invention discloses a high-hardness and high-strength WC-Co-based hard alloy. The high-hardness and high-strength WC-Co-based hard alloy comprises the following raw materials in parts by weight: 80-90 parts of WC powder, 5-15 parts of Co powder and 0.5-3 parts of an additive, wherein the additive consists of metal carbide and metal nitride; and the bending strength of the hard alloy is as highas 4810N / mm < 2 >, and the hardness of the hard alloy is as high as 94.5HRa. The invention further discloses a preparation method of the hard alloy. The hard alloy is prepared by performing multi-stage sintering on the raw materials of 0.8 microns m or below, and the adopted additive effectively inhibits the formation of polycrystalline in the sintering growth of the alloy, so that the high-hardness and high-strength performance of the hard alloy is realized. The invention further discloses a cutting tool prepared from the hard alloy. Due to the increase of the strength and the hardness of the cutting tool, the defect resistance is improved, and the service life is obviously prolonged.
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Description

technical field

[0001] The invention relates to the field of cemented carbide, in particular to a high-hardness and high-strength WC-Co-based cemented carbide, a preparation method thereof and a cutting tool. Background technique

[0002] Cemented carbide is mainly composed of micron-scale / nano-scale powders of carbides of high-hardness refractory metals (that is, as a hard phase), with cobalt (Co) as a binder phase, supplemented by inhibitors, and processed in a vacuum furnace or Powder metallurgy products sintered in a hydrogen reduction furnace. For the current cemented carbide materials, hardness and flexural strength are two important testing standards. Among them, the cemented carbide prepared by fine particle powder has higher flexural strength and hardness than the cemented carbide prepared by medium and coarse particle powder. At present, in the market of fine-grained cemented carbide, the hardness of common mainstream products is 91.5-94HRA, and the bending stren...

Claims

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