Combustion synthesis of ultrafine tungsten carbide powder

被引：0

作者：

Won H.I. ^{[1
]}

Nersisyan H.H. ^{[1
]}

Won C.W. ^{[1
]}

机构：

[1] Rapidly Solidified Materials Research Center (RASOM), Chungnam National University, Yuseong

来源：

J Mater Res | 2008年 / 9卷 / 2393-2397期

关键词：

Scanning electron microscopy;

D O I：

10.1557/jmr.2008.0289

中图分类号：

学科分类号：

摘要：

The synthesis of ultrafine tungsten carbide (WC) powder has been investigated from a WO3 + Mg + C mixture via combustion technique. The values of combustion parameters were estimated over the Mg concentration range 3 to 16 mol. Fast increasing tendency of the WC/W2C phase ratio from Mg concentration has been found in the final products. Phase pure WC was prepared with more than 10 mol Mg, and a small amount of ammonium carbonate (or urea) was blended with the WO3 + C mixture. The effects of the combustion conditions on product morphology and composition were evaluated using scanning electron microscopy and x-ray diffraction analysis. The results of the investigation indicate that carbon-containing compounds significantly enhance the combustion synthesis process; leading to higher conversion efficiencies and phase pure WC formation at 1500-1550 °C. The crystalline particles of WC showed a narrow distribution in particle size, with a mean diameter around 200 nm. The results are discussed in the context of gas-phase and solid-phase transport models. © 2008 Materials Research Society.

引用

页码：2393 / 2397

页数：4

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