Bandyopadhyay, Siddhartha and Mukerji, Joydeb (1987) Sintering and properties of SiAlONs without externally added liquid-phase. Journal of the American Ceramic Society, 70 (10). C273-C277. ISSN 0002-7820

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β′-Sialon has the general formula Si6-ZAlZOZN8-Z The synthesis of pure β′-sialon with three different Z values of 0.5, 1.0, and 2.0 in the system Si3N4-AlN-Al2O3-SiO2 has been reported without the addition of a foreign sintering aid. A small shift in the composition toward the SiO2 corner has been made in each case. The Z=1.0 and 2.0 sialon can be sintered almost to full density while that with Z=0.5 sialon is difficult even with a higher amount of excess oxide addition. A packing bed of Si3N4 and SiO2 in a weight ratio of 7:3 was found to be most useful. The coefficient of linear thermal expansion of Z=1.0 sialon is 2.2°10-6/°C (25° to 1000°C). The room-temperature modulus of rupture value can be retained up to 90% of the value at 1400°C. A similar trend has also been observed in the KlC value with temperature. The steady-state flexural creep rate varies from 0.5°10-6 to 2.5°10-6 h-1 in the temperature and load ranges of 1200° to 1300°C and 100 to 250 MPa.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 06 Apr 2015 11:05
Last Modified: 06 Apr 2015 11:05

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