Konca Solar Cells Co.

Konca, China

Konca Solar Cells Co.

Konca, China
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Cao F.,Shanghai JiaoTong University | Hao W.,Shanghai JiaoTong University | Wang X.,Konca Solar Cells Co. | Guo F.,Shanghai JiaoTong University | And 3 more authors.
Journal of the American Ceramic Society | Year: 2017

Steam oxidation of silicon carbide (SiC) layer in nuclear fuel particles were performed in flowing argon-water vapor mixture with a total pressure of 1 bar at 1173-1673 K. Both the phase composition and the microstructure of the oxide scale on the SiC layer varied with the oxidation temperature. Reaction rates of water vapor with the SiC layer were determined by measuring the oxide scale thickness. It was found that the oxidation of SiC layer follows the parabolic law. The activation energy was calculated to be 103±11 kJ/mol. It is proposed that the rate determine step of the oxidation is the diffusion of water vapor molecules in the oxide scale. The fracture strength of SiC shell after steam oxidation was evaluated using a crush test. The fracture strength decreased with the increase in the oxidation temperature due to the thinning of the SiC layer. © 2017 American Ceramic Society.


Luo L.,Shanghai JiaoTong University | Shan X.,Shanghai JiaoTong University | Zou Z.,Shanghai JiaoTong University | Zhao C.,Shanghai JiaoTong University | And 6 more authors.
Corrosion Science | Year: 2017

A high performance NiCoCrAlY bond coat with dense dendritic microstructure was fabricated using laser powder deposition (LPD) technique. The thermally grown oxides (TGO) formed on the coating deposited by laser powder deposition is predominantly alumina instead of the mix oxides usually formed on the coatings prepared by air plasma spray and high velocity air fuel. Isothermal oxidation tests performed at 1150. °C reveal that the LPD bond coat shows significantly better spallation resistance and lower TGO growth rate. The superior spallation resistance of the TGO is further discussed in relation to the unique microstructure of the LPD bond coat. © 2017 Elsevier Ltd.

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