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Thermal‐Shock Fracture and Damage Resistance Improved by Whisker Reinforcement in Alumina Matrix Composite
Author(s) -
Akatsu Takashi,
Takashima Hiroaki,
Shinoda Yutaka,
Wakai Fumihiro,
Wakayama Shuichi
Publication year - 2016
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12549
Subject(s) - materials science , thermal shock , whisker , whiskers , composite material , composite number , fracture (geology)
Fracture resistance of SiC‐whiskers‐reinforced Al 2 O 3 ‐matrix composite under thermal shock was examined. Equibiaxial tensile thermal stress in the composite was significantly reduced before fracture, because the whiskers made percolation paths that increase heat flux and thereby reduced the temperature gradient. The thermal‐shock fracture resistance ( R ′) of the composite is thus much higher than that of monolithic Al 2 O 3 . Thermal‐shock damage resistance ( R ″″) was estimated from the thermal‐shock stress when a surface crack propagates. R ″″ of the composite is also much higher than that of monolithic Al 2 O 3 owing to an increment of work‐of‐fracture due to crack‐face bridging of the whiskers.