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Strength retention in hot‐pressed ZrB 2 –SiC composite after thermal cycling exposure in air at 1200 and 1400°C
Author(s) -
Guo Shuqi
Publication year - 2019
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/jace.16413
Subject(s) - flexural strength , temperature cycling , materials science , composite material , composite number , delamination (geology) , cycling , thermal , history , paleontology , physics , archaeology , biology , meteorology , subduction , tectonics
The effect of thermal cycling exposure on room temperature flexural strength was examined in hot‐pressed ZrB 2 –SiC composite undergone cyclic heating‐cooling test at 1200 and 1400°C in air for up to 1000 or 500 cycles. For the post‐tested samples at 1200°C, the flexural strength of the composite initially increased and subsequently degraded with increase of number of thermal cycles (N). The strength retention displayed by the composite after N = 1000 cycles was approximately 80%. For the post‐tested samples at 1400°C, however, the flexural strength decreased with increase of N. After N = 500 cycles, the strength retention was approximately 45%. The strength decrease was associated with the formation and coarsening of defects in the oxidized reactive layer and the delamination of the outermost thinner dense oxide layer.