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Preparation method of tungsten-cobalt cemented carbide

A cemented carbide, tungsten-cobalt technology, applied in the field of preparation of tungsten-cobalt cemented carbide, can solve the problems of many micro-voids in the product, affecting the hardness of the product, large difference in grain size, etc., and achieve good physical properties and service life. Effect

Active Publication Date: 2020-04-14
晋城鸿硕智能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the supplementary carbon powder or tungsten powder will produce "regenerated tungsten carbide" during sintering. The grain size of regenerated tungsten carbide is greatly different from that of tungsten carbide raw materials, which will affect the physical properties and service life of cemented carbide.
When the regenerated tungsten carbide grain size is small, the cemented carbide is easy to form an arch bridge effect, and there are many micro voids in the product, which affects the bending strength and impact toughness of the product
When the regenerated tungsten carbide grain size is too large, it will affect the hardness of the product due to dislocations

Method used

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  • Preparation method of tungsten-cobalt cemented carbide
  • Preparation method of tungsten-cobalt cemented carbide
  • Preparation method of tungsten-cobalt cemented carbide

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preparation example Construction

[0012] The invention provides a preparation method of tungsten-cobalt hard alloy, which uses two kinds of tungsten carbide raw materials with different carbon contents to prepare hard alloy products. Specifically, the preparation method mainly includes the following steps:

[0013] The carbon content of A mass parts is c 1 % of the first tungsten carbide powder and B mass parts carbon content is c 2 % of the second tungsten carbide powder according to (c 1 %A+c 2 %B) / (A+B)=6.126% proportional relation preparation mixture carries out wet milling, wherein, c 1 %>6.126%, 02 %<6.126%;

[0014] Spray drying, molding and sintering the wet-milled mixture to obtain tungsten-cobalt hard alloy.

[0015] It can be understood that when the carbon content of the tungsten carbide raw material is 6.126%, the carbon content is the best, and the obtained tungsten-cobalt hard alloy has good physical properties and long service life.

[0016] In the preparation method of tungsten-cobalt ce...

Embodiment 1

[0020] 100 parts by mass of the first tungsten carbide powder with a carbon content of 6.15%, 100 parts by mass of the second tungsten carbide powder with a carbon content of 6.07%, 22 parts by mass of cobalt powder, 4 parts by mass of paraffin, and 0.4 parts by mass of oleic acid and 1 part by mass of chromium carbide were added to a wet mill and mixed for 45 hours, wherein the average particle diameters of the first tungsten carbide powder and the second tungsten carbide powder were both 0.6 μm. Then, the wet-milled mixture is spray-dried, molded, and sintered to obtain a cemented carbide product.

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Abstract

The invention relates to a preparation method of a tungsten-cobalt hard alloy. The preparation method comprises the following steps: mixing A parts by mass of first tungsten carbide powder with a carbon content of c1 percent with B parts by mass of second tungsten carbide powder with a carbon content of c2 percent in a ratio of (c1%A+c2%B) / (A+B) is equal to 6.126% to obtain a mixture, and performing wet grinding on the mixture, wherein c1% is greater than 6.126%, and c2% is greater than 0 and smaller than 6.126%; performing spray drying, molding and sintering on the mixture being subjected towet grinding to obtain the tungsten cobalt hard alloy. By adopting the preparation method of the tungsten-cobalt hard alloy, not only the tungsten-cobalt hard alloy is in a reasonable two-phase zone,but also the excessive difference between the grain size of regenerated tungsten carbide and the grain size of a tungsten carbide raw material can be avoided, thereby improving the physical propertiesand prolonging the service life.

Description

technical field [0001] The invention relates to the technical field of hard alloy production, in particular to a preparation method of tungsten-cobalt hard alloy. Background technique [0002] The phase composition of tungsten-cobalt (YG) cemented carbide has the following three situations due to the difference in carbon content: WC+γ+η, WC+γ, WC+γ+C, when the tungsten-cobalt cemented carbide is in WC+γ The product quality is the best in the two-phase region. The η phase due to too low carbon content and the C phase due to too high carbon content will have adverse effects on the physical properties and processing life of tungsten-cobalt cemented carbide. Therefore, it is very important to adjust the carbon of tungsten-cobalt cemented carbide so that it is in a reasonable two-phase region. [0003] In the prior art, the carbon adjustment of tungsten-cobalt cemented carbide is mainly to add an appropriate amount of carbon powder or tungsten powder in the process of preparing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10C22C29/08
CPCC22C1/058C22C29/067C22C29/08
Inventor 边伟袁晓波薛桂全李尧王树宏孙娜贾耀波项凤鸣李军旗蒋益民
Owner 晋城鸿硕智能科技有限公司