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Gradient cemented carbide with gradient change of binder phase and preparation method thereof

A cemented carbide, gradient change technology, applied in mining column teeth and oil column teeth, can solve problems such as unstable performance, and achieve the effects of good product consistency, good wear resistance and low cobalt content

Active Publication Date: 2019-01-11
武汉新锐合金工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a gradient cemented carbide in which the binder phase changes in a gradient and a preparation method thereof, which solves the problems of η phase and graphite phase and unstable performance in gradient alloys in the past

Method used

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  • Gradient cemented carbide with gradient change of binder phase and preparation method thereof
  • Gradient cemented carbide with gradient change of binder phase and preparation method thereof
  • Gradient cemented carbide with gradient change of binder phase and preparation method thereof

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Embodiment

[0048] Example: A Gradient Cemented Carbide with Gradient Binder Phase and Its Preparation Method

[0049] The preparation method comprises the steps in turn:

[0050] The first step is to prepare alloy mixture, which includes WC powder and Co powder, and the preparation process is as follows:

[0051] (1) Add WC powder and Co powder, mix evenly to form WC-Co powder, in which, the mass percentage of WC powder is 89%, the mass percentage of Co powder is 11%, and the WC-Co powder The sample can be abbreviated as WC-11% Co or 89%WC-11%Co;

[0052] (2) Add carbon powder or tungsten powder to adjust the carbon content of the WC-Co powder. The carbon content of the WC-Co powder is calculated in substoichiometric equivalents, and the upper limit of the carbon content is 6.125%×(1-Co%). The lower limit of content is 6.130%×(WC%-Co%×0.26); the carbon content of WC-Co powder affects the concentration distribution of cobalt content.

[0053] Table 1 WC-Co compositions of different car...

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Abstract

A gradient cemented carbide with a gradient change in the binder phase and a preparation method thereof, is characterized in that it includes the following steps in sequence: preparing WC-Co powder; adjusting the carbon content of the WC-Co powder, calculating the upper limit of the carbon content with substoichiometric equivalents and Lower limit; add molding agent; press into billet; remove molding agent; vacuum sintering; carburizing heat treatment, heat up to 900~1200°C, carry out carburizing heat treatment on the vacuum sintered body, pass gas in pulse mode; heat up to 1275~1325°C , carry out Co phase migration treatment; raise the temperature to 1380~1450°C, feed Ar gas, and keep the pressure at 10~20 mbar; pressure sintering; rapidly cool to 1270°C; alloy. The cobalt content in the gradient cemented carbide of the present invention is in a gradient distribution, the cobalt content on the surface is low, there is no infiltration of C phase, the hardness is high, the cobalt content in the core is high, the η phase is not contained, the toughness is high, and the overall performance is good.

Description

technical field [0001] The invention belongs to the field of tool materials, and in particular relates to a gradient cemented carbide with a gradient change in binder phase and a preparation method thereof. The gradient cemented carbide of the present invention is especially suitable for applications requiring high wear resistance on the alloy surface and high toughness at the core The mining column teeth, oil column teeth, cutting and mold preparation of cemented carbide. Background technique [0002] The general WC-Co cemented carbide is an alloy with tungsten carbide powder as the main material and cobalt powder as the binder. Cobalt content and tungsten carbide particle size determine the hardness and toughness of the alloy, and adjusting the ratio between these two elements can be used in different fields. Generally, the cobalt content is low, the hardness is high, and the wear resistance is high. On the contrary, the cobalt content is high, and the toughness is high, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05B22F3/10B22F3/14
CPCC22C1/051C22C29/08B22F3/101B22F3/1021B22F3/1035B22F3/14B22F2998/10B22F2999/00B22F2201/20B22F2201/30B22F2201/11B22F2207/03B22F1/10B22F3/02
Inventor 吴何洪余立新赵基鸿陆庆忠鲍立强刘华平
Owner 武汉新锐合金工具有限公司
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