Member, The American Ceramic Society.
Reaction Sintering of HfC/W Cermets with High Strength and Toughness
Article first published online: 28 DEC 2012
© 2012 The American Ceramic Society
Journal of the American Ceramic Society
Volume 96, Issue 3, pages 867–872, March 2013
How to Cite
Sun, S.-K., Zhang, G.-J., Liu, J.-X., Zou, J., Ni, D.-W. (2013), Reaction Sintering of HfC/W Cermets with High Strength and Toughness. Journal of the American Ceramic Society, 96: 867–872. doi: 10.1111/jace.12139
- Issue published online: 17 MAR 2013
- Article first published online: 28 DEC 2012
- Manuscript Accepted: 19 NOV 2012
- Manuscript Received: 3 JUL 2012
- National Natural Science Foundation of China. Grant Numbers: 50 972 152, 51 002 168, 91 026 008, 51 002 169
- Shanghai Institute of Ceramics
Hafnium carbide/tungsten (HfC/W) cermets were prepared by an in situ reaction sintering process, using hafnium oxide (HfO2) and tungsten carbide (WC) as the raw materials. The reaction path, densification behavior, microstructure development, and mechanical properties of the cermets were comprehensively investigated. It was found that WC decomposed to tungsten semicarbide (W2C) and tungsten (W) in sequence, and meanwhile HfC was formed by carbothermal reduction between HfO2 and as-released carbon from the dissociation of WC. The solid solution formation between HfC and W during sintering was also studied. The obtained cermets (>98% TD) have a Vickers' hardness of 8.16 GPa, a fracture toughness of 14.45 MPa m1/2, and a high flexural strength of 1211 MPa.