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Ultrahigh-pressure densification of nanocrystalline WB ceramics

Published online by Cambridge University Press:  31 January 2011

Ying Chen ,
Duanwei He ,
Jiaqian Qin ,
Zili Kou ,
Shanmin Wang  and
Jianghua Wang
Jianghua Wang
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People's Republic of China
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Abstract

Phase-pure nanostructured WB ceramics are hot pressed at ultrahigh pressures of 1.0 to 3.0 GPa and high temperatures of 700 to 1000 °C (UHPHT) for 60 min. The UHPHT samples are nanograin size from 15 to 40 nm. Our experimental observation shows that ultrahigh pressure could improve densification, and the density of WB samples could reach 99.4% of theoretical. The comparative experiments carried out at ambient pressure and temperatures of 550 to 1100 °C for 60 min indicate that the external pressure was favorable for phase-pure and highly dense WB formation. In addition, the UHPHT samples give a high hardness value of 28.9 ± 0.8 GPa.

Keywords

NanostructureWB
Type
Materials Communications
Information
Journal of Materials Research , Volume 25 , Issue 4 , April 2010 , pp. 637 - 640
Copyright
Copyright © Materials Research Society 2010

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