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Transient Thermal Stress Behavior in ZrO 2 ‐Toughened Al 2 O 3
Author(s) -
BECKER PAUL F.
Publication year - 1981
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.1151-2916.1981.tb09555.x
Subject(s) - thermal shock , materials science , composite material , phase (matter) , tetragonal crystal system , stress (linguistics) , cubic zirconia , thermal , degradation (telecommunications) , mineralogy , ceramic , thermodynamics , chemistry , linguistics , philosophy , physics , organic chemistry , telecommunications , computer science
The initial strength of (σ i ) and thermal shock resistances (Δ T c and σ r /σ i ), as determined by quench tests, of Al 2 O 3 ‐ZrO 2 composites are increased by increasing amounts of tetragonal ZrO 2 second phase for contents of up to ∼15 vol%. For composites with ≤9 vol% ZrO 2 the increases in σ r and Δ T c reflect the increase in γ IC with addition of ZrO 2 However, for ZrO 2 contents >9 vol%, the thermal shock resistances (Δ T c and σ r /σ i ) and σ i are also affected by machining‐induced microcracking in the surface of the samples. For ZrO 2 contents >14 vol%, bulk microcracking can become extensive and result in a degradation of σ i and Δ T c .