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Processing of Polymer-Derived Ceramic Composite Coatings on Steel

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Polymer-derived ceramic composites are being investigated as environmental barrier coatings to protect stainless steel from oxidation and carburization. Coatings have been produced using poly(hydridomethylsiloxane) as a preceramic polymer and titanium disilicide as an expansion agent. Processing parameters have been optimized and a relationship has been derived to predict the final coating thickness based on slurry viscosity and dip coating withdrawal speed. Microstructural analysis reveals a composite coating of oxidized filler particles in a silica matrix. A diffusion layer is visible at the coating–steel interface, indicating good bonding. The optimized coatings are ∼18 m thick, and have some residual porosity and a density of 2.56 g/cm3.
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Document Type: Research Article

Affiliations: Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195

Publication date: January 1, 2008

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