Effect of acidic environment on subcritical crack growth in alumina ceramics
- Russian Academy of Sciences, Moscow (Russian Federation). High Tech Ceramics Research Centre
Alumina ceramics are good candidates for applications involving corrosion-active media, e.g. in seal-rings, bearings and impellers in pumps. However, their strength is susceptible to deterioration in chemical environments. This phenomenon is believed to result primarily from a stress-enhanced chemical reaction between the environment and the bonds at the tips of microstructural stress concentrators, such as microcracks, pores and grain boundaries. As a consequence, alumina ceramics exhibit subcritical crack growth prior to catastrophic failure, and their strength and fracture are dependent on time or stressing rate. In the alumina ceramics processing, sintering additives are often utilized which are forming the grain-boundary phase. The behavior of such a phase may control the slow crack growth processes. In this context, the present study is aimed at investigation of the influence of acidic environment on crack velocity exponent for aluminas sintered with different additives.
- OSTI ID:
- 616239
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 6 Vol. 38; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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