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High temperature strength of silicon nitride ceramics with ytterbium silicon oxynitride

Published online by Cambridge University Press:  31 January 2011

Toshiyuki Nishimura ,
Mamoru Mitomo  and
Hisayuki Suematsu
Toshiyuki Nishimura
Affiliation:
National Institute for Research in Inorganic Materials, 1–1, Namiki, Tsukuba, Ibaraki, 305, Japan
Mamoru Mitomo
Affiliation:
National Institute for Research in Inorganic Materials, 1–1, Namiki, Tsukuba, Ibaraki, 305, Japan
Hisayuki Suematsu
Affiliation:
Materials and Structures Laboratory, Tokyo Institute of Technology, 4529, Nagatsuta, Midoriku, Yokohama, Kanagawa, 226, Japan
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Abstract

Silicon nitride ceramics with ytterbium silicon oxynitride (Yb4Si2O7N2) as secondary phase were fabricated by hot-pressing the powder mixtures, including 50.0 to 97.0 mol% of silicon nitride with a mixture of Yb2O3 and SiO2 (Yb2O3/SiO2 = 4). Sinterability of the materials with Yb2O3 was higher than that with Y2O3 in the same composition of raw powder mixtures. High density materials were obtained under the condition of 50.0 to 89.1 mol% of silicon nitride in raw powder mixtures. Mechanical properties of silicon nitride containing 97.6 mol% of Si3N4 and 2.4 mol% of Yb4Si2O7N2 were measured. Fracture toughness measured by the indentation technique was 5.9 MPam1/2. Bending strength at room temperature and at 1500 °C was 977 MPa and 484 MPa, respectively. The silicon nitride grains consisted of highly elongated rod-like grains and thin needle-like grains. The Yb4Si2O7N2 grains were crystallized at multigrain junctions and bonded close to Si3N4 grains. High strength at high temperature is supposed to be based on the presence of crystalline Yb4Si2O7N2 having a high melting point.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 1 , January 1997 , pp. 203 - 209
Copyright
Copyright © Materials Research Society 1997

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