Premium
Cyclic Thermal Shock Resistance of Several Advanced Ceramics and Ceramic Composites
Author(s) -
Schneibel Joachim H.,
Sabol Stephen M.,
Morrison Jay,
Ludeman Evan,
Carmichael Cecil A.
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02562.x
Subject(s) - thermal shock , materials science , composite material , whisker , ceramic , composite number , thermal expansion , shock (circulatory) , medicine
The cyclic thermal shock behavior of two Si 3 N 4 ceramics, two SiC‐whisker‐reinforced alumina composites (Al 2 O 3 /SiC w ), a SiC‐particulate‐reinforced alumina (Al 2 O 3 /SiC p ), and an alumina continuously reinforced with SiC fibers (Al 2 O 3 /SiC f ) composite has been studied. Specimens were repeatedly quenched from 1473 K into a fluidized bed with a heat transfer coefficient of 1400 W/(Km 2 ) [250 Btu/(hft 2 F)]. The thermal shock damage was assessed by room‐temperature flexure strength measurements. Si 3 N 4 and Al 2 O 3 /SiC p showed no noticeable damage after 100 cycles, whereas Al 2 O 3 /SiC w and Al 2 O 3 /SiC f degraded substantially. The experimental results are discussed and rationalized in terms of finite element simulations and microstructural observations. Our analysis suggests that the thermal shock performance of other materials may be estimated from comparisons with the present work.