Property Screening and Evaluation of Ceramic Turbine Materials
Abstract
State-of-the-art technical ceramics, mainly silicon carbide and silicon nitride, that have potential as structural components in advanced gas turbine engines, were evaluated. Thermal and mechanical property data were generated on candidate materials, and the results were interpreted with respect to microstructure, purity, secondary phases, environmental effects, and processing methods. Measured properties were related to microstructure. Failure modes and the nature of the critical strength-controlling flaws were determined by optical and SEM fracture surface analysis. Structure-property relations were developed, and generated data were compared to literature data. To date, over sixty materials have been extensively characterized. Properties measured include: flexure strength, elastic modulus, stress-strain, fracture toughness, creep, oxidation, thermal expansion, thermal diffusivity, thermal shock, and stress rupture. Emphasis was placed on defining the limiting aspects of each material, such as the time-dependent strength relating to the existence of operable subcritical crack growth mechanisms. Property measurements were made up to 1500 C in air atmosphere.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1984
- Accession Number
- ADA142739
Entities
People
- D. C. Larsen
- J. W. Adams
Organizations
- IIT Research Institute