Thermal Shock Resistance of an A1N-BN-SiC Ceramic
Mechanical and thermal properties of AlN-BN-SiC (ABS) ceramics were used to calculate the R, R', and R"" thermal shock parameters. the R parameter values ranged from ∼400° to 450°C. Specimens were thermal shocked by water quenching and the critical quench temperatures (ΔTC) were compared with those of a baseline SiC composition. the behavior of the ABS was predicted by R parameter calculations while the behavior of the baseline material was predicted by the R' calculations due to its higher thermal conductivity (87 W•(m•K)-1) as compared with the ABS materials (∼30 W•(m•K)−1). the highest critical quench temperature for ABS was ∼415°C with the lowest at 360°C, while the critical quench temperature for the baseline material was 450°C. Using temperature dependent data over an appropriate temperature range (room temperature to the predicted ΔTC), the R parameters of the ABS materials were within 15°C of predictions. the baseline material was ∼1.7 times higher than predicted and this was attributed to the high-thermal conductivity of the material resulting in soft thermal shock during quench testing.
A. A. Buchheit et al., "Thermal Shock Resistance of an A1N-BN-SiC Ceramic," Journal of American Ceramic Society, Wiley-Blackwell, May 2009.
The definitive version is available at http://dx.doi.org/10.1111/j.1551-2916.2009.03050.x
Materials Science and Engineering
U.S. Army Space and Missile Defense Command
Keywords and Phrases
ABS Ceramics; Mechanical Properties; Thermal Properties; Thermal Shock Parameters
Article - Journal
© 2009 Wiley-Blackwell, All rights reserved.