Superfine carbide alloy and mfg method thereof

A cemented carbide and alloy technology, applied in the field of ultra-fine cemented carbide and its manufacturing, can solve the problems of WC grain growth, failure to achieve corrosion resistance, and reduced alloy performance

Inactive Publication Date: 2003-10-22
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0005] But judging from the current work, it is impossible to achieve the comprehensive effect of improving corrosion resistance and refining grains.
Using Ni as the bonding metal or adding Cr cannot fundamentally solve the problem of corrosion resistance; adding a grain growth inhibitor will reduce the performance of the alloy, and the finer the powder, it is difficult to achieve a uniform distribution of the inhibitor, which will cause WC grains abnormal growth

Method used

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Examples

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Embodiment 1

[0013] Example 1: In this example, the Co-Al bonding metal phase used is composed of: Al 16wt%, Co84wt%; the composition of the composite alloy is Co-Al 10%, Re 1%, WC 89%. The preparation method is as follows: firstly, the bonding alloy Co-Al is prepared by high-energy ball milling. According to the weight ratio of the above-mentioned bonding metal components, high-energy ball milling is carried out in a protective medium. What is obtained by ball milling is a partially alloyed and highly dispersed mixed powder of some elements, and its particle size BET value is 0.8μ. Then mix according to the specified weight ratio of cemented carbide components, and carry out intensive ball milling, and then shape and vacuum sinter the cemented carbide mixture obtained by grinding, and the particle size of the original WC powder is 0.5μ. The sintering temperature is 1360° C., and the holding time is 20 minutes. The ultra-fine cemented carbide finally obtained has a WC grain size of 200 nm....

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PUM

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Abstract

The present invention relates to a superfine hard alloy and its production method. Said alloy is a composite alloy formed from main component WC hard phase, Co-Al adhesive metal phase and rare earth metal element phase. The composition of said alloy includes (wt%) 10-15% of Co-Al, in which Al is 13-20% and Co is 80-87%, 1-3% of Re and 82-89% of WC. Its production method includes the following steps: firstly, high-energy ball grinding to obtain adhesive alloy Co-Al, preparing raw materials according to the defined mixed ratio, forcedly ball grinding, vacuum sintering at 1360 deg.C and heat-insulating for 20 min, finally obtaining said invented superfine hard alloy.

Description

technical field [0001] The invention relates to an ultrafine cemented carbide and a manufacturing method thereof, belonging to the technical field of alloy material manufacturing technology. Background technique [0002] The binder metal in cemented carbide is usually cobalt (Co). As a binder metal, cobalt can make cemented carbide have better sintering performance and mechanical properties, but the oxidation resistance and corrosion resistance of cobalt are poor, and because WC It has a high solubility in it, so it is easy to grow WC grains in liquid phase sintering, which makes it difficult to prepare ultra-fine and nano-hard alloys. A lot of work has been done to improve the corrosion resistance of cemented carbide and to prepare ultra-fine and nano-hard alloys. [0003] In terms of improving corrosion resistance, nickel has been used as bonding metal, such as WC-Ni cemented carbide; some people also add Cr to WC-Co to form WC-Co-Cr cemented carbide. [0004] In terms o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C29/08
Inventor 王兴庆李晓东郭海亮何宝山
Owner SHANGHAI UNIV
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