Estimation of lifetime of zirconia and zirconia-alumina composites using Constant Stress Rate data
Agnieszka Wojteczko, Radosław Lach, Kamil Wojteczko, Zbigniew Pędzich
Quarterly No. 1, 2017 pages 14-18
DOI:
keywords: tetragonal zirconia, zirconia-alumina composites, subcritical crack growth, constant stress rate test, lifetime determination
abstract Ceramic failure, at stresses lower than those when KIc is reached, might be an effect of subcritical crack propagation.It occurs when the material is in service in the presence of water (even water vapour) for a long time. If this phenomenon leads to limiting its useful life, it is important to predict the lifetime of a ceramic component under specific conditions. Dynamic tests are suitable to determine subcritical crack growth parameters. Calculations are made to determine material behaviour under static loading on the basis of strength data. The paper presents the results for zirconia-alumina composites with 5, 15 and 50 vol.% inclusions to compare materials with different types of microstructures. Pure zirconia sintered bodies were used as the reference material.