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Technology for preparing ultrafine WC powder containing grain growth inhibitors Cr and V

A technology for grain growth and inhibition of grain growth, applied in the technical field of preparation of ultra-fine WC powder containing grain growth inhibitors Cr and V Problems such as storage and transportation difficulties, WC particles grow up, etc., to achieve the effects of easy control, sufficient supply, and simple preparation process

Inactive Publication Date: 2012-03-21
王萍 +2
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  • Abstract
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Problems solved by technology

There are several problems in this method: 1) It is difficult to control the particle size growth of tungsten powder in the reduction stage; 2) It is difficult to store and transport ultra-fine tungsten powder; 3) WC particles will grow in the carbonization process, etc.

Method used

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  • Technology for preparing ultrafine WC powder containing grain growth inhibitors Cr and V

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Embodiment Construction

[0038] In response to the urgent demand for ultra-fine WC powder at home and abroad, through years of repeated tests, we have developed the preparation technology of ultra-fine WC powder containing grain growth inhibitors Cr and V, and have been used in several domestic cemented carbide products and Manufacturers of powder metallurgy products have been successfully applied. First, the superfine WC powder containing grain growth inhibitors Cr and V is evenly mixed with a certain proportion of Co powder, and then pressed into a certain shape of the blank to obtain a cemented carbide product with ultrafine grains after high-temperature vacuum sintering.

[0039]

[0040] Example 1: A cemented carbide manufacturer A in Zhuzhou City, Hunan Province, uses our ultra-fine WC powder containing grain growth inhibitors Cr and V to produce ultra-fine-grained cemented carbide molds, and its service life is ordinary 1.5 times that of cemented carbide molds.

[0041]

[0042] Example 2: A...

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Abstract

Due to favorable high-temperature strength, toughness and wear-resistance, submicron and ultrafine WC-Co hard alloy products take up high-end markets of tools and dies, mining, machinofacture, infrastructure construction and the like for a long time, and are widely applied in a global range. The invention discloses a production technology and process for preparing ultrafine WC powder by using ammonium paratungstate (APT) through direct reduction carbonization according to years of researches. By improving a powder preparation process and adopting a special method to add a proper amount of trace elements, the technology disclosed by the invention can be used to produce ultrafine WC powder containing grain growth inhibitors Cr and V, and a corresponding high-grade hard alloy product.

Description

[0001] Technical field [0002] The present invention involves a production technology and process that uses the incorporation of trace elements as additives to inhibit grains, and use APT to directly restore carbonization and prepare ultra -fine WC powder. [0003] The preparation of the preparation of the present invention uses an appropriate amount of trace element CR and V as a grain inhibitor.How to add trace elements and the content control of each trace element is one of the core technologies of the invention. [0004] The ultra -fine WC powder containing grain -growing inhibitors CR and V involved in the present invention can be used to produce hard alloy products with ultra -fine grains. [0005] Background technique [0006] Since the advent of sub-fine and ultra-fine WC-CO hard alloy products, due to its high toughness, high abrasion resistance and higher high temperature intensity, these products are becoming more and more valued by various industrial countries.More a...

Claims

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Application Information

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IPC IPC(8): C01B31/36
Inventor 王平王子仪郑峰
Owner 王萍
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