Title

Thermal Shock Resistance of an A1N-BN-SiC Ceramic

Abstract

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.

Department(s)

Materials Science and Engineering

Sponsor(s)

U.S. Army Space and Missile Defense Command

Keywords and Phrases

ABS Ceramics; Mechanical Properties; Thermal Properties; Thermal Shock Parameters

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2009 Wiley-Blackwell, All rights reserved.


Share

 
COinS