Influence of the chemical composition of precursors and reduction conditions on the properties of magnesiothermic tungsten powders

被引：5

作者：

Kolosov, V. N. ^{[1
]}

Miroshnichenko, M. N. ^{[1
]}

Orlov, V. M. ^{[1
]}

机构：

[1] Russian Acad Sci, Kola Sci Ctr, Tananaev Inst Chem & Technol Rare Elements & Mine, Akademgorodok 26a, Apatity 184209, Murmansk Oblast, Russia

来源：

INORGANIC MATERIALS | 2016年 / 52卷 / 08期

关键词：

MgWO4; CaWO4; Ca3WO6; magnesiothermic reduction; specific surface area;

D O I：

10.1134/S0020168516080100

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied tungsten powders prepared by reducing the tungsten oxide compounds WO3, MgWO4, CaWO4, and Ca3WO6 with magnesium vapor in the temperature range 700-800A degrees C. In the case of the reduction of WO3 and MgWO4, we observed segregation of reaction products: removal of most of the forming magnesium oxide from the reaction zone. The powders prepared by reducing WO3, MgWO4, and CaWO4 consisted of alpha-W, whereas the reduction of Ca3WO6 at temperatures below 740A degrees C led to the formation of both alpha-W and beta-W. The use of tungsten precursors containing refractory oxides (MgWO4, CaWO4, and Ca3WO6) allowed us to obtain tungsten powders with specific surface areas at a level of 20 m(2)/g and mesoporous structures.

引用

页码：783 / 790

页数：8

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