Accession Number : AD0748837

Title :   Development of Protective Coatings for Columbium Alloy Gas Turbine Blades.

Descriptive Note : Final technical rept. 1 Jul 69-30 Jul 71,

Corporate Author : SYLVANIA ELECTRIC PRODUCTS INC HICKSVILLE N Y HIGH TEMPERATURE COMPOSITES LAB

Personal Author(s) : Priceman,Seymour ; Kubick,Richard

Report Date : JUN 1972

Pagination or Media Count : 169

Abstract : Four developmental cycles of candidate selection, screening test and evaluation were performed on coatings for columbium turbine blade airfoils and root sections. Candidate coatings included numerous fused silicide compositions, silicided sintered underlays, and fused silicides plus glass, ceramic, soft metal, and flame sprayed overlays. The first three developmental cycles employed thermogravimetric analysis, isothermal furnace tests, slow cyclic tests, thermal fatigue torch tests, ballistic impact plus furnace oxidation tests, and prestrain plus oxidation tests as screening criteria. Extensive coating and coating processing compatibility studies were carried out with the aim of preventing deleterious reactions between root and airfoil coatings and degradation of the substrate alloy mechanical properties. The program was concluded with a series of advanced simulated environmental tests and mechanical property evaluations.

Descriptors :   (*PROTECTIVE TREATMENTS, *GAS TURBINE BLADES), (*NIOBIUM ALLOYS, *COATINGS), SILICIDES, METAL COATINGS, CORROSION INHIBITION, CERAMIC COATINGS, TEST METHODS

Subject Categories : Coatings, Colorants and Finishes
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE