Accession Number : ADA299188

Title :   Office of Naval Research Workshop on Prevention of Environmental Degradation of Advanced Materials at Temperatures Above 1000 deg C. Held in Philadelphia, PA on 10-11 May 1994. Report of Session A: Environmental (Oxidation) Protection Including Advanced Coating Concepts at Temperatures Above 1000 deg. C.

Corporate Author : OFFICE OF NAVAL RESEARCH ARLINGTON VA

PDF Url : ADA299188

Report Date : 11 MAY 1994

Pagination or Media Count : 12

Abstract : The recommendations in this section are concerned with reusable reentry vehicles, aircraft turbine engines and commercial-industrial turbines operating in the 1000 deg to 1650 deg C (1832 deg to 3000 deg F) range for time periods of days to weeks. The materials systems to be considered are superalloys and covalent-fiber (e.g. C, SiC, Si3N4) composites, with carbon, SiC, Si3N4, glass-ceramic and MoSi2 matrices. Past work has identified two general types of viable coatings and coating combinations. These are: (1) silicon-based coatings on ceramic-matrix and carbon-carbon composites, and (2) thermal-barrier coatings (TBCs) for advanced superalloys. The most pressing needs and impacts are in the applications of CMCs for gas-turbine engine structures operating in the range of 1000 deg to 1400 deg C. This temperature range covers most applications in the combustor, turbine, and nozzle section of both military and commercial engines. While more advanced applications in the future might require CMCs that would have to perform at temperatures over 1 400 deg C, the current problems must be solved first or there may never be any long term interest in CMCs. jg p.1 and 4

Descriptors :   *ENVIRONMENTS, *DEGRADATION, *COMPOSITE MATERIALS, *HIGH TEMPERATURE, *OXIDATION, *ENVIRONMENTAL PROTECTION, THERMAL PROPERTIES, REENTRY VEHICLES, TIME INTERVALS, AIRCRAFT ENGINES, ENGINE COMPONENTS, MATERIALS, MILITARY EQUIPMENT, CERAMIC MATRIX COMPOSITES, COMBUSTORS, GAS TURBINES, CARBON CARBON COMPOSITES, SILICON, NOZZLES, NAVAL RESEARCH, REUSABLE EQUIPMENT, WORKSHOPS, SUPERALLOYS, PRESSING(FORMING), BARRIER COATINGS.

Subject Categories : Laminates and Composite Materials
      Physical Chemistry
      Ceramics, Refractories and Glass
      Coatings, Colorants and Finishes
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE