Abstract
Si3N4/SiC composite ceramics were hot‐pressed in order to investigate the crack‐healing behavior under stress. Semi‐elliptical surface cracks of 100 μm in surface length were made on each specimen. The pre‐cracked specimens were crack‐healed under cyclic or constant bending stress, and the resultant bending strength and cyclic fatigue strength were studied. The threshold stress for crack‐healing was investigated at healing temperatures of 1000° and 1200°C. The cyclic fatigue strengths of crack‐healed specimens were also investigated at healing temperatures of 900° and 1000°C. The main conclusions are as follows: (1) The threshold cyclic and constant stresses for crack‐healing, below which pre‐cracked specimens recovered their bending strength, were 300 MPa, which was 75% of the bending strength of the pre‐cracked specimens and (2) the crack‐healed specimens exhibited quite high cyclic fatigue strength at crack‐healing temperatures of 900° and 1000°C.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
