Details

Autor(en) / Beteiligte

• Buchheit, Andrew A.
• Hilmas, Greg E.
• Fahrenholtz, William G.
• Deason, Douglas M.

Titel

Thermal Shock Resistance of an AlN-BN-SiC Ceramic

Ist Teil von

• Journal of the American Ceramic Society, 2009-06, Vol.92 (6), p.1358-1361

Ort / Verlag

Malden, USA: Blackwell Publishing Inc

Erscheinungsjahr

2009

Link zum Volltext

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• 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.