Effects of Residual Stresses on Strength and Crack Resistance in ZrO2 Ceramics with Alumina Coating
Source abstract
Abstract
By covering a thin Al 2 O 3 coating on ZrO 2 substrate, compressive stress caused by the mismatch of thermal expansion coefficients between the coating and substrate was introduced in the surface layer of Al 2 O 3 -ZrO 2 pre-stressed ceramics (marked as A C Z S pre-stressed ceramics). Vickers indentation test was carried out to check the crack resistance in the surface layer and substrate influenced by the residual stresses. The enhancement of the crack resistance in surface layer results in a high flexural strength and excellent damage tolerance. Both theoretical analysis and experimental results show that the compressive stress and crack resistance in the surface layer increase with the increasing ratio of the cross-sectional area of ZrO 2 substrate to Al 2 O 3 coating. Due to the residual compressive stress existing in Al 2 O 3 coating, a high flexural strength of (120720) MPa was measured for ZrO 2 specimens coated with 40 m Al 2 O 3 . The flexural strength is 32% higher than that of monolithic ZrO 2 , and about triple of the value of Al 2 O 3 .
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Ferroelectric and Piezoelectric Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (19)
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