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Ultrafine crystal grain hard alloy material

An ultra-fine grain, cemented carbide technology, applied in the field of cemented carbide materials, can solve the problems of reduced bending strength and toughness, and it is difficult to unify at one height.

Inactive Publication Date: 2006-01-11
XIANGTAN TIANJIE HARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As we all know, when the hardness (HRA) of ordinary cemented carbide reaches 92, the flexural strength (TRS) is around 1200N; when the flexural strength (TRS) is increased to 2500N, the hardness (HRA) is mostly around 85. unified at one height
The traditional method is to increase the hardness and wear resistance by reducing the Co content and selecting finer grain WC, but at the same time its flexural strength and toughness are reduced, and vice versa

Method used

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Embodiment Construction

[0008] The technical points of the present invention are: use tungsten carbide powder WC with a particle size of 0.4-0.6 μm (coercive force HC value 34-45) and a total carbon of 6.15-6.20%, plus metal cobalt powder Co, vanadium carbide VC and chromium carbide Cr 3 C 2 The powder is formulated into a mixture, and the weight percentage is Co: 8%, VC: 0.3%, Cr 3 C 2 : 0.4%, WC: 91.3% composed of ultra-fine grain cemented carbide materials.

[0009] The main production process of the ultrafine grain cemented carbide material of the present invention is as follows:

[0010] 1. Mixture preparation

[0011] The mixture consists of tungsten carbide powder WC, metal cobalt powder Co, vanadium carbide VC and chromium carbide Cr 3 C 2 The powder is mixed according to the ratio specified in the process and the paraffin molding agent is added in proportion, put into the ball mill and use acetone as the wet milling medium for a specified time, and then put it in a vacuum drying mixer ...

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PUM

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Abstract

An ultra-fine-grain hard alloy with high hardness, strength, toughness and anti-wear nature is prepared from ultra-fine-grain WC (90-92.5 wt%), Co (7-9), VC (0.1-0.5) and Cr3C2 (0.3-0.7).

Description

technical field [0001] The invention relates to a cemented carbide material, in particular to a superfine-grained cemented carbide material. Background technique [0002] As we all know, when the hardness (HRA) of ordinary cemented carbide reaches 92, the flexural strength (TRS) is around 1200N; when the flexural strength (TRS) is increased to 2500N, the hardness (HRA) is mostly around 85. unified at one level. The traditional method is to increase the hardness and wear resistance by reducing the Co content and selecting finer grain WC, but at the same time its flexural strength and toughness are reduced, and vice versa. This contradiction has always puzzled cemented carbide production. Contents of the invention [0003] The object of the present invention is to provide an ultra-fine-grain cemented carbide material, which has high hardness and wear resistance, and at the same time has high strength and toughness. [0004] The object of the present invention is achieved ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08
Inventor 胡文琛易兵
Owner XIANGTAN TIANJIE HARD MATERIAL