Accession Number : ADA292886

Title :   Brush Seal Shaft Wear Resistant Coatings. Phase 1.

Descriptive Note : Final rept. May 94-Mar 95,

Corporate Author : TECHNETICS CORP DELAND FL

Personal Author(s) : Howe, Harold

PDF Url : ADA292886

Report Date : 28 MAR 1995

Pagination or Media Count : 38

Abstract : Brush seals suffer from high wear, which reduces their effectiveness. This work sought to reduce brush seal wear by identifying and testing several industry standard coatings. One of the coatings was developed for this work. It was a co-sprayed PSZ with boron-nitride added for a high temperature dry lubricant. Other coatings tested were a PSZ, chrome carbide and a bare rotor. Testing of these coatings included thermal shocking, tensile testing and wear/coefficient of friction testing. Wear testing consisted of applying a coating to a rotor and then running a sample tuft of SiC ceramic fiber against the coating. Surface speeds at point of contact were slightly over 1000 ft/sec. Rotor wear was noted, as well as coefficient of friction data. Results from the testing indicates that the oxide ceramic coatings cannot withstand the given set of conditions. Carbide coatings will not work because of the need for a metallic binder, which oxidizes in the high heat produced by friction. All work indicated a need for a coating that has a lubricant contained within itself and the coating must be resistant to an oxidizing environment. (AN)

Descriptors :   *CERAMIC COATINGS, *SEALS(STOPPERS), *WEAR RESISTANCE, VELOCITY, TENSILE STRENGTH, HIGH TEMPERATURE, COMPARISON, SURFACE FINISHING, CARBIDES, OXIDATION, THERMAL EXPANSION, PROTECTIVE COATINGS, ZIRCONIUM, CHROMIUM, CERAMIC FIBERS, BINDERS, FRICTION, THERMAL CYCLING TESTS, LUBRICANTS, BORON NITRIDES, BRUSHES.

Subject Categories : Coatings, Colorants and Finishes
      Adhesives, Seals and Binders

Distribution Statement : APPROVED FOR PUBLIC RELEASE