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Carbon, South Korea

Kim J.I.,Korea Institute of Ceramic Engineering And Technology | Lee Y.J.,Korea Institute of Ceramic Engineering And Technology | Kim S.-R.,Korea Institute of Ceramic Engineering And Technology | Kim Y.-H.,Korea Institute of Ceramic Engineering And Technology | And 3 more authors.
Korean Journal of Materials Research | Year: 2011

To improve the chemical stability of metal, the ceramic coatings on metallic materials have attracted interest from many researchers due to the chemical inertness of ceramic materials. To endure strong acids, SiOC coating on metal substrate was carried out by dip coating method using 20wt% polyphenylcarbosilane solution; SiC powder was added to the solution at 10wt% and 15wt% to improve the mechanical properties and to prevent cracks of the film. Thermal oxidation as a curing step was carried out at 200°C for crosslinking of the polyphenylcarbosilane, and the coating samples were pyrolysized at 800°C under argon to convert the polyphenylcarbosilane to SiOC film. The thicknesses of the SiOC coating films were 2.36 μm and 3.16 μm. The quantities of each element were measured as SiO1.07C6.33 by EPMA, and it can be confirmed that the SiOC film from polyphenylcarbosilane was formed in a manner that was carbon rich. The hardness of the SiOC film was found to be 3.2Gpa through nanoindentor measurement. No defect including cracks appeared in the SiOC film. The weight loss of the SiOC coated stainless steel was within 2% after soaking in 10% HCl solution at 80°C for one week. From these results, SiOC coating shows good potential for application to protect against severe chemical corrosion of stainless steel. Source


Patent
Tokai Carbon Korea Co. | Date: 2012-09-11

A method of manufacturing a silicon carbide structure includes forming a silicon carbide layer by depositing silicon carbide on a base plate by chemical vapor deposition, removing the base plate, decreasing electrical conductivity by heat-treating the silicon carbide structure, and removing a thickness of 200 m from an upper surface and a lower surface of the silicon carbide structure. In the present invention, silicon carbide is deposited by a CVD method, and the electrical conductivity of the silicon carbide is reduced to the electrical conductivity required for a protection ring of a plasma device through a post-treatment and a post-process. The electrical conductivity may be adjusted even without using separate additives.

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