Convenient Route for the Synthesis of Transition-Metal Pnictides by Direct Reduction of Phosphate, Arsenate, and Antimonate Precursors†

1997 ◽  
Vol 9 (10) ◽  
pp. 2113-2116 ◽  
Author(s):  
J. Gopalakrishnan ◽  
Sonal Pandey ◽  
K. Kasthuri Rangan
Keyword(s):  
Transition Metal ◽  
Direct Reduction ◽  
Convenient Route

Properties of Carbide-Metal Cermets Prepared from Composite Powders by Direct Reduction and Carburization Process

2008 ◽  
Vol 368-372 ◽  
pp. 1099-1103 ◽  
Author(s):  
Li Yan ◽  
Gang Qin Shao ◽  
Z. Xiong ◽  
Xiao Liang Shi ◽  
Xing Long Duan ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Raw Materials ◽  
Direct Reduction ◽  
Transition Metal Carbide ◽  
Metal Composite ◽  
Metal Carbide ◽  
Vacuum Sintering ◽  
Composite Powders

The transition-metal carbide cemented by metal has excellent combined properties. In this study, cermets were prepared by vacuum sintering from carbide-metal composite powders. The transition- metal oxides (Cr2O3, MoO3, V2O5, Nb2O5 and TiO2), cementing-metal oxides (Co3O4 and NiO), and carbon black were used as raw materials to pre-synthesize composite powders such as Cr3C2-Co, Mo2C-Co, VC-Co, NbC-Co and TiC-Ni, by a direct reduction and carburization process in vacuum. Results show that the participation of Co3O4 and NiO as well as the vacuum circumstance were greatly propitious to the carburization of transition-metal oxides into carbides. The carbothermal condition was greatly improved by the direct reduction and carburization process.

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