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Method for preparing tungsten-cobalt hard alloy

A cemented carbide and tungsten-cobalt technology, which is applied in the field of preparation of tungsten-cobalt cemented carbide, can solve problems such as difficulty in meeting large demand, high price, and insufficient performance of cemented carbide

Inactive Publication Date: 2005-09-14
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of this grade of cemented carbide is not high enough, its average bending strength is 1800MPa, and its average hardness is 91.5HRA
At the same time, because the additive TaC in YG6X is expensive and the market supply is unstable, it is difficult to meet the large demand of the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Example 1: Co powder with a Fischer particle size of 1.8 μm and Cr with a size of 4.0 μm 3 C 2 powder and 1.60μm WC powder, respectively 7.0%, 0.7% and the balance by weight, unloaded after 72 hours of wet grinding, settled for 5 hours, and then dried, mixed with molding agent, pressed molding, and removed molding agent Afterwards, it is sintered into cemented carbide at 1400°C. Its hardness is 92.4HRA, and its bending strength is 2230MPa.

Embodiment 2

[0007] Example 2: Co powder with a Fischer particle size of 1.0 μm and Cr with a size of 4.3 μm 3 C 2 powder and 1.80μm WC powder, respectively 7.0%, 0.8% and the balance according to weight percentage, unload after 72 hours of wet grinding, settle for 5 hours, and then dry, mix molding agent, press molding, remove molding agent Afterwards, it is sintered into cemented carbide at 1410°C. Its hardness is 92.4HRA, and its bending strength is 2430MPa.

Embodiment 3

[0008] Example 3: Co powder with a Fischer particle size of 2.5 μm and Cr with a size of 4.2 μm 3 C 2 powder and 1.20μm WC powder, respectively 7.0%, 1.0% and the balance according to weight percentage, unload after 72 hours of wet grinding, settle for 5 hours, and then dry, mix molding agent, press molding, remove molding agent Afterwards, it is sintered into cemented carbide at 1400°C. Its hardness is 92.6HRA and its bending strength is 2180MPa.

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PUM

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Abstract

The invention discloses a manufacturing method for tungsten cobalt hard alloy, it includes following steps: mixing, wetmilling, drying, mixing with forming agent, pressing and forming, eliminating forming agent, sintering, it selects Co powder whose Fisher particle size is (1.0-2.5) mu m, Cr3C2 powder whose Fisher particle size is (4.0-4.6) mu m and WC powder with (1.2-1.8) Fisher particle size. The weight percentage of Co Powder, Cr3C2 powder, WC powder are (7.0-7.5)%, (0.7-1.0)% and the residue. The hard alloy in the invention has excellent density and rigidity and the price is low.

Description

1. Technical field [0001] The invention relates to a preparation method of tungsten-cobalt cemented carbide. 2. Background technology [0002] At present, in the field of mechanical manufacturing, such as the field of cutting cast iron and stone with strong abrasiveness and high impact force, high requirements are placed on the performance of cemented carbide as cutting tools, which need to have high bending strength and hardness at the same time. Now the cemented carbide industry has begun to develop and produce ultra-fine alloys with grains less than or equal to 0.5 μm to meet this requirement. However, because ultrafine alloys are currently facing many difficulties in production and have extremely high requirements for production equipment, it is still difficult to promote them on a large scale. The materials currently used in this field mainly include YG6X grades. However, the performance of this grade of cemented carbide is not high enough, its average bending strengt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C29/08
Inventor 吴建国钟耿
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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