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

Active Publication Date: 2020-05-08
江西江钨硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of alloy sintering, crystal grains often aggregate to form polycrystals, thus forming a bottleneck, making it difficult to improve the strength of the alloy

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A high-hardness and high-strength WC-Co-based cemented carbide, comprising the following raw materials in parts by weight: 80 parts of WC powder, 5 parts of Co powder, and 0.5 parts of additives;

[0029] The additive is composed of metal carbide Cr 3 C 2 and metal nitride Cr 3 N 2 composition.

[0030] The metal carbide accounts for 0.1% of the total mass of the raw material.

[0031] The metal nitride accounts for 0.1% of the total mass of raw materials.

[0032] The average particle size of the WC powder and Co powder is 0.3 μm.

[0033] A preparation method of high-hardness and high-strength WC-Co-based cemented carbide, comprising the following steps:

[0034] S1: Take WC powder, Co powder, and additives in proportion, use ethanol as the grinding medium, PEG (polyethylene glycol) as the binder, and mix them into initial materials. Under the same conditions, the ball mill was fully ground for 10 hours to form a mixture, which was dried, sieved, and molded int...

Embodiment 2

[0042] A high-hardness and high-strength WC-Co-based cemented carbide, comprising the following raw materials in parts by weight: 85 parts of WC powder, 10 parts of Co powder, and 1 part of additive;

[0043] The additives consist of metal carbides VC and metal nitrides VN.

[0044] The metal carbide accounts for 0.3% of the total mass of the raw material.

[0045] The metal nitride accounts for 0.3% of the total mass of raw materials.

[0046] The particle size of the WC powder and Co powder is 0.6 μm.

[0047] A preparation method of high-hardness and high-strength WC-Co-based cemented carbide, comprising the following steps:

[0048] S1: Take WC powder, Co powder, and additives in proportion, use ethanol as the grinding medium, PEG (polyethylene glycol) as the binder, and mix them into initial materials. Under the condition of ball milling for 15 hours, the mixture was fully ground. The mixture is dried, sieved, and molded into a sample strip under a one-way load of 5-1...

Embodiment 3

[0056] A high-hardness and high-strength WC-Co-based cemented carbide, comprising the following raw materials in parts by weight: 90 parts of WC powder, 15 parts of Co powder, and 3 parts of additives;

[0057] The additive consists of metal carbide TiC and metal nitride TaN.

[0058] The metal carbide accounts for 0.5% of the total mass of the raw material.

[0059] The metal nitride accounts for 0.5% of the total mass of raw materials.

[0060] The particle size of the WC powder and Co powder is 0.8 μm.

[0061] A preparation method of high-hardness and high-strength WC-Co-based cemented carbide, comprising the following steps:

[0062] S1: Take WC powder, Co powder, and additives in proportion, use ethanol as the grinding medium, PEG (polyethylene glycol) as the binder, and mix them into initial materials. Under these conditions, the ball mill was fully ground for 20 hours to form a mixture. The mixture is dried, sieved, and molded into a sample strip under a one-way load...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08B22F5/00C22C1/05
CPCB22F5/00B22F2005/001C22C1/051C22C29/067C22C29/08
Inventor 郭永忠汤昌仁曾程遥
Owner 江西江钨硬质合金有限公司
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