Property Screening and Evaluation of Ceramic Vane Materials.
Abstract
Extensive thermal and mechanical property data have been generated on four candidate turbine materials, Norton NC-132 hot pressed Si3N4, NC-435 siliconized SiC, NC-350 reaction sintered Si3N4, and Kawecki-Berylco reaction sintered Si3N4. A more limited amount of information is currently available for six additional materials. Available Si3N4 and SiC represent a family of materials with wide performance characteristics. To summarize the main applicability of the materials studied most comprehensively to date: (1) NC-132 HP Si3N4 would be used where high strength (short duration at elevated temperatures) and good fatigue resistance in the turbine atmosphere are required, (2) NC-350 RS Si3N4 would be utilized where superior strength and creep resistance above 1400 C are required, (3) and NC-435 Si/SiC would be employed where higher thermal conductivity or higher elastic modulus were required. Silicon carbide materials in hot pressed or high density sintered forms would find application at temperatures greater than 1500 C, which is about the limit for high purity silicon nitride.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1977
- Accession Number
- ADA062905
Entities
People
- D. C. Larsen
- G. C. Walther
Organizations
- IIT Research Institute