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Method for preparing ultra-coarse-grain tungsten-cobalt hard alloy

A cemented carbide, tungsten-cobalt technology, applied in the field of preparation of ultra-coarse-grained tungsten-cobalt cemented carbide, can solve the problem of low high temperature hardness and high temperature strength of alloy, poor impact resistance and thermal plastic deformation resistance, restricting cemented carbide Application range and other issues, to achieve the effect of improving the overall performance of the alloy, improving the wear resistance and impact toughness, good strength and microhardness

Inactive Publication Date: 2015-09-23
HUNAN CENTURY SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bending strength 2600~3000MPa, hardness Hv 30 1150~1320, the matching between strength and microhardness is poor, and the overall performance is low. Restricts the application range of cemented carbide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing ultra-coarse-grained tungsten-cobalt cemented carbide, which includes the following process steps: batching, wet grinding, drying, pre-calcination treatment, wet mixing, drying, mixing of forming agents, granulation, compression molding and vacuum low-pressure integration Sintering; cobalt powder and tungsten carbide powder (that is, WC powder) are selected as ingredients, the mass ratio of cobalt powder and tungsten carbide powder is 2.5:97.5, and the tungsten carbide powder is selected from coarse-grained tungsten carbide powder with a Fsss particle size of 13.0-13.5 μm. The particle size of cobalt powder is 1.4-2.0 μm; the wet grinding is ball milling, the ball milling medium is acetone, the ratio of ball to material is 3:1, the ratio of solid to liquid is 5:1, and the wet grinding time is 7 hours; dry after wet grinding , the mixture obtained after drying is pre-calcined, and the temperature of the pre-calcination is raised to 700-850 °C after ...

Embodiment 2

[0022] A method for preparing ultra-coarse-grained tungsten-cobalt cemented carbide, which includes the following process steps: batching, wet grinding, drying, pre-calcination treatment, wet mixing, drying, mixing of forming agents, granulation, compression molding and vacuum low-pressure integration Sintering; cobalt powder and tungsten carbide powder (that is, WC powder) are selected as ingredients, the mass ratio of cobalt powder and tungsten carbide powder is 2.4:97.6, and the tungsten carbide powder is selected from coarse-grained tungsten carbide powder with a Fsss particle size of 13.5-15.5 μm. The particle size of cobalt powder is 1.4-2.0 μm; the wet grinding is ball milling, the ball milling medium is acetone, the ratio of ball to material is 3:1, the ratio of solid to liquid is 5:1, and the wet grinding time is 8 hours; dry after wet grinding , the mixture obtained after drying is pre-calcined, and the temperature is raised to 800 °C after 4 hours of pre-calcination,...

Embodiment 3

[0025] A method for preparing ultra-coarse-grained tungsten-cobalt cemented carbide, which includes the following process steps: batching, wet grinding, drying, pre-calcination treatment, wet mixing, drying, mixing of forming agents, granulation, compression molding and vacuum low-pressure integration Sintering; cobalt powder and tungsten carbide powder (that is, WC powder) are selected as ingredients, the mass ratio of cobalt powder and tungsten carbide powder is 2.6:97.4, and the tungsten carbide powder is selected from coarse-grained tungsten carbide powder with a Fsss particle size of 15.5-17.2 μm. The particle size of cobalt powder is 1.4-2.0 μm; the wet grinding is ball milling, the ball milling medium is acetone, the ratio of ball to material is 3:1, the ratio of solid to liquid is 5:1, and the wet grinding time is 9 hours; dry after wet grinding , the mixture obtained after drying is pre-calcined, and the temperature is raised to 750 °C after 4 hours of pre-calcination,...

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Abstract

The invention discloses a method for preparing a high-tenacity super-coarse-grained tungsten and cobalt hard alloy. The method comprises the following process steps of: mixing raw materials, performing wet grinding, drying, pre-sintering, performing wet mixing, drying, adding a forming agent, palletizing, performing compression moulding and performing integral sintering in vacuum under low pressure, wherein in the step of mixing the raw materials, cobalt powder and tungsten carbide powder are blended in the mass ratio of 2.4-2.6:97.4-97.6; metal cobalt powder and Co2W4C nanoparticles are added into the pre-sintered mixture in which the mass ratio of cobalt to tungsten carbide is 8-13:87-92; and the adding amount of the Co2W4C nanoparticles is accordant with the condition that the mass ratio of the cobalt to the Co2W4C nanoparticles is 1:0.045-0.055. The WC average grain size of the prepared hard alloy is up to 4.0 to 5.2mu m; the bending strength is up to 3,000 to 3,400MPa; and the hardness HRA is up to 88.0 to 90.8.

Description

technical field [0001] The invention relates to a preparation method of cemented carbide, in particular to a preparation method of ultra-coarse tungsten-cobalt cemented carbide. Background technique [0002] With the continuous development of the cemented carbide industry, the requirements for its raw material WC powder (ie tungsten carbide powder) are getting higher and higher. In particular, the preparation of ultra-coarse cemented carbide has strict requirements on the particle size of WC powder. At present, the degree of aggregation of WC powder is relatively high, and the particle size of the powder is not large enough. WC particle aggregates exist in coarse-grained WC powder. Due to the existence of aggregates, it is easy to cause the illusion that the Fischer average particle size is large, but the actual particle size is finer. In addition, the combination of aggregates varies in degree of tightness, which increases the difficulty of manufacturing high-quality cemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C29/08
Inventor 肖华单水桃周汉凡
Owner HUNAN CENTURY SPECIAL ALLOY
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