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A Study of the Effect of Tungsten Oxide on W, WC Powder and Alloy Properties
Jiang Cijin,Shen Paul,Wang Huan 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
This is about the effects deoxidization, carbonization and alloying preparation on fine grain W, WC, and grade YG8 powder reduced by "yellow tungsten oxide" and "blue tungsten oxide". The result indicates that yellow tungsten has single composition and blue tungsten oxide has complex composition. With this feature, yellow tungsten oxide got better uniformity and concentration distribution on fine particle size W and WC powder than blue tungsten oxide's. The grade alloy YG8 that made of this W or WC powder has uniform alloy construction, concentrated WC grain distribution and better alloy properties.
The preparation of nanophase tungsten carbide powder with zeolite-X catalysts
Lee, Jong Dae,Lee, Dong-Hwal,Park, No-Kuk,Ryu, Si Ok,Lee, Tae Jin Elsevier 2006 CURRENT APPLIED PHYSICS Vol.6 No.6
<P><B>Abstract</B></P><P>The reduction–carburization of tungsten trioxide (WO<SUB>3</SUB>) under carbon monoxide flow was studied in the temperature range of 300–750°C. The reduction–carburization of WO<SUB>3</SUB> was improved by mechanically mixing with zeolite-HX, -NaX and -KX. The interaction between cation in zeolite-X and oxygen in WO<SUB>3</SUB> affected the improvement of the reduction–carburization of WO<SUB>3</SUB> to WC. Moreover, the improved reduction–carburization of WO<SUB>3</SUB> could lead to the decrease of reaction temperature. Because the particle size of WC is in contact with a reaction temperature, the nanophase WC can be prepared at low temperature. In particular, the particle size of WC was controlled by reaction temperature. The particle sizes of produced WC at 550, 650 and 700°C were 25, 50 and 100nm respectively.</P>