Hostname: page-component-78c5997874-lj6df Total loading time: 0 Render date: 2024-11-02T23:29:14.766Z Has data issue: false hasContentIssue false
  • English
  • Français

Microstructure and Mechanical Properties of Hot-Pressed and Pressureless Sintered WC-Al2O3 Ceramic Composites

Published online by Cambridge University Press:  22 February 2011

Hidehiro Endo  and
Masanori Ueki
Masanori Ueki
Affiliation:
Advanced Materials & Technology Research Laboratories, Nippon Steel Corporation 1618 Ida, Nakahara-ku, Kawasaki 211, Japan
Get access

Abstract

Fully densified WC-A12O3 composites were successfully consolidated by both hot-pressing and pressureless sintering. The optimum hot-pressing condition for the composites was 1700°C for 2h under a pressure of 40MPa. A remarkable improvement in mechanical properties was achieved in the composite system, especially in WC-30 and -70vol%A12O3, compared to the monolithic WC and A12O3 ceramics. The addition of MgO as a sintering aid had a great effect on the properties of the composites. WC-30vol%A12O3 composite with 1.Owt% MgO addition exhibited flexural strength higher than 1000MPa up to 1200°C, fracture toughness; KIC≥7MPa√m, and hardness; HV ≥2450. In pressureless sintering with the addition of MgO as a sintering aid and subsequent HIP treatment, the WC-30vol%A12O3 composite exhibited the flexural strength higher than 900MPa up to 1200°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 327: Symposium N – Covalent Ceramics II: Non-Oxides , 1993 , 331
Copyright
Copyright © Materials Research Society 1994

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Claussen, N., J. Am. Ceram. Soc. 59, 49 (1976).Google Scholar
2. Becher, P.F. and Wei, G.C., J. Am. Ceram. Soc. 67, C267 (1984).Google Scholar
3. Wahi, R.P. and Ilschner, B., J. Mater. Sci. 15, 875 (1980).Google Scholar
4. Kimura, I., Hotta, N., Hiraoka, Y., Saito, N. and Yokota, Y., J. Eur. Ceram. Soc. 5, 23 (1989).Google Scholar
5. Belyaev, A.V., Zlenko, A.A. and Chernenko, A.N., Poroshk. Metall. 11, 89 (1990).Google Scholar
6. Cutler, R.A., Rigtrup, K.M. and Virkar, A.V., J. Am. Ceram. Soc. 75, 36 (1992).Google Scholar
7. Ueki, M. and Endo, H., ISIJ Int'l. 32, 943 (1992).Google Scholar
8. Endo, H., Ueki, M. and Kubo, H., J. Mater. Sei. 26, 3769 (1991).Google Scholar