KJ Ceramics 31

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Detailed Program

Paper Number : TF-P11

Time Frame : 12:00~13:30

Presentation Date : Friday, 28, November

Session Name : Thin Films & Layers

Session Chair 1# : -

Session Chair 2# : -

Multilayer Coatings for Protecting Carbon Materials at temperatures at 1700 C or higher

Changhun Hwang

Kyungnam Univerity

Keywords: Multilayer, Ceramics, carbon/carbon composite, Oxitation Resistance, CVD
Carbon materials like graphite, or carbon fiber reinforced carbon matrix composites have excellent properties at high temperatures in an inert atmosphere, but are degraded rapidly by oxidation above 400oC in air. Silicon carbide multilayer coating was designed for protecting carbon materials from oxidation. The coating was prepared by consecutive process of chemical vapor deposition (CVD) and solution method. The SiC and buffer layers were prepared by CVD at 1100-1150oC under vaccum using methyltrichlorosilane, methane, and hydrogen as source and carrier gases. Functional layer having SiOC glassy materials was prepared by dip-coating and decomposition of inorganic polymers. The functional layer had self-healing capability by which cracks formed in refractory ceramic layer were healed at high temperature. Oxidation test for carbon/carbon composites with multilayer coating showed excellent oxidation resistance at 1700oC. The microstructure and chemical composition were examined before and after the test with scanning electron microscopy.

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