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Zirconia Dispersed Mullite Ceramics Through Hot-Pressing Of Amorphous ZrO 2 -SiO 2 -Al 2 O 3 Obtained by Rapid Quenching

Published online by Cambridge University Press:  25 February 2011

Masahiro Yoshimura ,
Tatsuo Noma ,
Yasuhiro Hanaue  and
Shigeyuki Sōmiva
Masahiro Yoshimura
Affiliation:
Research Laboratory of Engineering Materials and Department of Materials Science and Engineering, Tokyo Institute of Technology, 4259, Nagatsuta, Midori, Yokohama 227, Japan.
Tatsuo Noma
Affiliation:
Research Laboratory of Engineering Materials and Department of Materials Science and Engineering, Tokyo Institute of Technology, 4259, Nagatsuta, Midori, Yokohama 227, Japan.
Yasuhiro Hanaue
Affiliation:
Research Laboratory of Engineering Materials and Department of Materials Science and Engineering, Tokyo Institute of Technology, 4259, Nagatsuta, Midori, Yokohama 227, Japan.
Shigeyuki Sōmiva
Affiliation:
Research Laboratory of Engineering Materials and Department of Materials Science and Engineering, Tokyo Institute of Technology, 4259, Nagatsuta, Midori, Yokohama 227, Japan.
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Abstract

Zirconia dispersed mullite ceramics were fabricated through hot-pressinq at a pressure of 25 MPa from the amorphous material of 2Owt%ZrO2-8Owt%(3Al2O3 2SiO2) obtained by rapid quenching of the melts. The densification was initiated at ∼950°C and accelerated by crystallization of mullite and t-ZrO2 to yield almost pore free samples about 1050°C. This sample seemed to contain Si02-rich glassy phase in addition to A12O3-rich mullite and t-ZrO2 The further heat-treatments with/without pressing brought about the reaction between the Si02-rich glassy phase and the A1203-rich mullite phase to yield nearly stoichiometric mullite. and growth of the mullite grains and the t-ZrO2 particles up to 1 u m in size at 1600°C. The TEM observation revealed a duplex microstructure of twinned m-ZrO2 at the triple points and fine t-ZrO2 in the center of the mullite grains. The fracture toughness of the specimen increased with hot-pressing temperatures up to 2.2 MPam1/2 in the samples at 1600°C.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 78: Symposium E – Advances in Structural Ceramics , 1986 , 165
Copyright
Copyright © Materials Research Society 1987

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References

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