Transient Thermal Stress Behavior in ZrO2-Toughened Al2O3

Autor:	Paul F. Becker
Rok vydání:	1981
Předmět:	Initial strength Thermal shock Tetragonal crystal system Materials science Phase (matter) Materials Chemistry Ceramics and Composites Transient (oscillation) Composite material
Zdroj:	Journal of the American Ceramic Society. 64:37-39
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1981.tb09555.x
Popis:	The initial strength of (σi) and thermal shock resistances (ΔTc and σr/σi), as determined by quench tests, of Al2O3-ZrO2 composites are increased by increasing amounts of tetragonal ZrO2 second phase for contents of up to ∼15 vol%. For composites with ≤9 vol% ZrO2 the increases in σr and ΔTc reflect the increase in γIC with addition of ZrO2 However, for ZrO2contents >9 vol%, the thermal shock resistances (ΔTc and σr/σi) and σi are also affected by machining-induced microcracking in the surface of the samples. For ZrO2 contents >14 vol%, bulk microcracking can become extensive and result in a degradation of σi and ΔTc.
Databáze:	OpenAIRE
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