Accession Number : ADA326966

Title :   Multilayer Microlaminated Ceramic Thermal Barrier Coating.

Descriptive Note : Final rept. Aug 96-Feb 97,

Corporate Author : MATERIALS MODIFICATION INC FAIRFAX VA

Personal Author(s) : Yu, Charles ; Yao, Zhengui ; Krupashankara,

PDF Url : ADA326966

Report Date : 14 MAY 1997

Pagination or Media Count : 49

Abstract : This report describes the Phase I efforts to develop a new approach for applying micro-laminated thermal barrier coatings on superalloys through a sol-gel process. This new approach has better control of not only the process parameters but also the coating compositions and microstructures. Both thermal and mechanical characteristics of the coatings can be potentially optimized, and the coating will be more tolerant towards strain damage, have better thermal insulation and provide higher oxidation/corrosion resistance as compared with the existing single layer thermal barrier coatings. Cubic zirconia (yttria-stabilized-zirconia) can be coated through a sol-gel process onto bond coated superalloys. Zircon (ZrSiO4) can be coated onto the yttria-stabilized-zirconia (YSZ) layer as a reinforcement layer. Cubic zirconia (yttria- stabilized-zirconia) can be coated onto the zircon layer. In Phase II, we will concentrate on optimization of the formulation, coating procedure and post treatment. Different coating techniques mentioned above will be used. A prototype coated turbine blade will be manufactured and undergo testing under simulated and actual conditions.

Descriptors :   *CERAMIC MATERIALS, *BARRIER COATINGS, THERMAL PROPERTIES, MECHANICAL PROPERTIES, MICROSTRUCTURE, OPTIMIZATION, LAYERS, FORMULATIONS, PROTOTYPES, TURBINE BLADES, CORROSION RESISTANCE, CONCENTRATION(COMPOSITION), BONDING, ZIRCONIUM, OXIDATION RESISTANCE, SUPERALLOYS, YTTRIUM OXIDES, THERMAL INSULATION, SOL GEL PROCESSES.

Subject Categories : Ceramics, Refractories and Glass
      Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE