Accession Number : AD0865375

Title :   Tungsten Reinforced Oxidation Resistant Columbium Alloys.

Descriptive Note : Rept. no. 1 (Annual), 1 Nov 68-30 Nov 69,

Corporate Author : SOLAR TURBINES INTERNATIONAL SAN DIEGO CA

Personal Author(s) : Brentnall, W. D. ; Klein, M. J. ; Metcalfe, A. G.

Report Date : JAN 1970

Pagination or Media Count : 82

Abstract : Composites of high-strength filaments in oxidation-resistant matrices are being developed for use at temperatures above 2000F. The major effort is directed to development of composites with columbium-base alloy matrices and tungsten filaments. This concept offers an alternative to conventional columbium alloy development because the matrix is required to supply only oxidation resistance and the filaments supply the strength. Various matrices were tested for oxidation and sulfidation resistance and for compatibility with tungsten and sapphire filaments. A model system consisting of W-3Re filaments in a Cb-Ti-Cr-Al matrix was adopted to assess the feasibility of this approach and to identify problem areas. Rule-of-mixture tensile strengths were obtained for this system over the temperature range 70-2400F and stress-rupture tests in air showed good potential. The stress-rupture tests in air showed superior properties to super-alloys when compared on basis of density-corrected strength. The mechanical properties of the model system will be evaluated further before development of systems with greater oxidation resistance and elevated temperature strength. (Author)

Descriptors :   *COMPOSITE MATERIALS), (*GAS TURBINES, CORROSION RESISTANT ALLOYS), (*NIOBIUM ALLOYS, (*REINFORCING MATERIALS, NIOBIUM ALLOYS), TUNGSTEN ALLOYS, WIRE, FILAMENTS, COMPATIBILITY, CORROSION RESISTANCE, SAPPHIRE, HEAT RESISTANT MATERIALS.

Subject Categories : Laminates and Composite Materials
      Properties of Metals and Alloys
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE