Preparation of tungsten diboride by a combination of boro/carbothermal reduction process and spark plasma sintering

被引：10

作者：

Long, Ying ^{[1
]}

Liu, Bo ^{[1
]}

Lin, Shiming ^{[1
]}

Lin, Hua-Tay ^{[1
]}

机构：

[1] Guangdong Univ Technol, Sch Electromech Engn, Guangzhou 510006, Guangdong, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2022年 / 42卷 / 13期

基金：

中国国家自然科学基金;

关键词：

Tungsten diboride; Boro/carbothermal reduction; Synthesis mechanism; Densification; MECHANICAL-PROPERTIES; MICROSTRUCTURE; SUPERHARD; POWDERS; BORIDE; CARBIDE; SEARCH;

D O I：

10.1016/j.jeurceramsoc.2022.06.006

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Submicron tungsten diboride (WB2) powder was successfully synthesized with the ratio of WO3:B4C:C = 2:1.1:5. The effects of carbon sources (carbon black or graphite) and heat treatment temperatures (1100, 1200, 1300 degrees C) on the phase composition and microstructure of the as-synthesized WB2 powder samples were studied. The results showed that ultrafine WB2 powders with oxygen content of 1.65 wt% and 2.04 wt% were obtained by carbon black and graphite at 1300 degrees C, respectively. The relatively density of the as-sintered WB2 samples achieve similar to 91 % and similar to 87 % without any kind of sintering additive after spark plasma sintering at 1500 degrees C under 30 MPa for 10 min. The formation mechanism of the WB2 powders synthesized by boro/carbothermal reduction was proposed and verified by thermodynamic calculation according to the phases present in the powder synthesized at different temperatures.

引用

页码：5229 / 5237

页数：9

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