Microstructually Developed Toughening Mechanisms in Ceramics. Compressive Surface Stresses Developed in Ceramics by a Oxidation-Induced Phase Change.
Abstract
Although further work is required to quantify the oxidation kinetics to obtain detailed surface stress distributions, it has been amply demonstrated that significant surface stresses can be developed by an oxidation-induced phase change. This demonstration is important since it opens a new route to increase the reliability of ceramics in applications where the mechanical properties of the surface are important, viz application (e.g., bearing surfaces, erosion, etc.) which involve surface modes of failure. The method described is equivalent to the chemical tempering of glass, and it should have wide applicability to many polyphase ceramics. On the other hand, this work has also demonstrated that the use of such materials in high temperature, oxidizing environments may lead to serious problems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1978
- Accession Number
- ADA057242
Entities
People
- F. F. Lange