Abstract
Combination of crack-healing and proof-test is proposed as a new methodology to guarantee the reliability of a ceramics component, because crack-healing and proof test are effective techniques to overcome surface cracks and embedded flaws, respectively. In this study, the effect of crack-healing on the Weibull distribution was investigated for alumina⁄SiC particle composite which had excellent crack-healing ability. Scale parameter of the crack-healed specimens was increased 2. 4 times that of as-cracked specimen. Moreover, minimum fracture stress guaranteed at high temperature for the specimens proof-tested at R. T. after crack-healing was estimated. The fractures stress and fatigue strength of the proof-tested specimens at elevated temperature was also measured at elevated temperature. From these results, minimum fracture stress at high temperature was determined. The minimum fracture stress guaranteed agreed well with the values measured by experiments. Therefore, it is concluded that the combination of crack-healing and proof-test is the effective techniques to guarantee the fracture stress at high temperature of the ceramics component.
