Recovery of tungsten carbides to prepare the ultrafine WC-Co composite powder by two-step reduction process

被引：34

作者：

Liu, Baixiong ^{[1
,2
]}

Shi, Anhong ^{[3
]}

Su, Qi ^{[3
]}

Chen, Guangjun ^{[3
]}

Li, Wei ^{[3
]}

Zhang, Lina ^{[1
]}

Yang, Bin ^{[1
]}

机构：

[1] Jiangxi Univ Sci & Technol, Inst Res & Engn, Ganzhou, Jiangxi, Peoples R China

[2] Univ Connecticut, Inst Mat Sci, Storrs, CT USA

[3] Jiangxi Univ Sci & Technol, Sch Mat Sci & Engn, Ganzhou, Jiangxi, Peoples R China

来源：

POWDER TECHNOLOGY | 2017年 / 306卷

基金：

中国国家自然科学基金;

关键词：

Cemented carbides; Recycling process; Carbothermal reduction; WC-Co composite powder; OXIDATION; MICROSTRUCTURE;

D O I：

10.1016/j.powtec.2016.10.071

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A relatively low-cost, controllable particle size and eco-environmental recycling process for the oxidation and reduction of waste YG8 cemented carbides was achieved, The WC-Co composite powder has been synthesized by two-step reduction process. Reduction of WO3/CoWO4 in the hydrogen gas at 1073 K is a feasible way for the production of W18O49 phase. Then the carbothermal reduction of the as-synthesized powder was carried out in Argon atmosphere mixed with ethanol gas, which was used as reductant as well as carbon source. Both the temperature and time in the present method of combing the higher reactivity of the precursor material and the better contact between the gas-solid reactants are apparently reduced as compared with the conventional methods. Based on the thermodynamic calculation and XRD analysis, the possible reactions involved in the carbothermal reduction were proposed, The influence of the holding time and carbon content were investigated. The two-step reduction process is a useful technique to prepare homogeneous WC-Co composite powder with particle size below 200 nm at low temperature. (C) 2016 Published by Elsevier B.V.

引用

页码：113 / 119

页数：7

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