Abstract
Subcritical crack growth in alumina ceramics is a phenomenon that arouses interest with respect to the problems of performance of various engineering parts, e.g. seal rings, bearings, etc. The subcritical crack growth results in dependence of strength on time known as delayed failure. Effect of environment on subcritical crack-growth exponent for various alumina-base ceramics is studied. A dynamic fatigue technique is utilized. It is revealed that the subcritical crack-growth resistance of glass-bonded aluminas is significantly lower than that of high-purity alumina in air and in water. Only negligible difference was revealed in the delayed failure behaviour of ceramics bonded with various common glassy phases. However, high-purity alumina ceramics are much more susceptible to fatiguing in an acidic environment compared to the yttria-alumosilicate glass-bonded alumina: hydrochloric acid environment reduces drastically the crack-growth velocity exponent due to the low stress–corrosion resistance of magnesia-enriched interfaces in high-alumina ceramics.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.