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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
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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

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