C. Henager, Y. Shin, PNNL, Richland, WA; Y. Blum, SRI International, Inc., Menlo Park, CA; S. M. Schwarz, University of Central Florida and NanoSpective, Inc., Orlando, FL; L. A. Giannuzzi, University of Central Florida, Orlando, FL; R. Bordia, J. Torrey, University of Washington, Seattle, WA
Corrosion resistant coatings are being developed at PNNL, SRI , and the Univ. of Washington using preceramic polymers filled with reactive metal powders and inert powders. Starting with a poly(hydromethylsiloxane) precursor, a synthesis method to produce a poly(methylsilsesquioxane) preceramic polymer together with the desired filler powder(s) is described. Preceramic polymers filled with a variety of powders have been prepared and examined, including SiC, Al/Al2O3, Al/SiC, and Ti. Coatings from polymer-powder slurries are applied to stainless steel substrates, 316SS and 430SS, using standard coating methods and pyrolyzed in a variety of reactive atmospheres at 700C to 800C. Of particular interest is the ability to apply these coatings using paint spraying methods in air. Coating morphology, microstructure, and phase content will be described and discussed as a function of powder content and processing conditions using scanning and transmission electron microscopy techniques. Coating adhesion and effects of thermal cycling on adhesion and coating lifetime will be evaluated.
Summary: Corrosion resistant coatings that can be applied using paint spraying methods in air are being developed at PNNL using preceramic polymers filled with reactive metal powders and inert powders. Starting with a poly(hydromethylsiloxane) precursor, a method to produce a poly(methylsilsesquioxane) preceramic polymer together with the desired filler powder(s) is described.
