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Optical Properties of AlO-SiO Coating Deposited by Plasma Spraying

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society, ISSN: 0454-5648, Vol: 47, Issue: 2, Page: 236-242
2019
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Article Description

AlO-SiO coatings were prepared by plasma spraying at different process parameters. The influences of particle melting state, microstructure and phase composition on the optical reflectivity of the coatings prepared at different spraying parameters were investigated. The results show that melting state of the particles becomes more complete when the plasma spraying power increases. The SiO of AlO-SiO coating changes from amorphous to crystalline, and the solid phase reaction of some AlO and SiO generates AlSiO. The formation of the new phase can make the phase composition of the whole coating system more complex and rich in phase interface. The increase of phase interface is beneficial to the improvement of optical properties of coatings. In addition, the formation of the layered structure and the increase of the porosity in the interior of the coating both are beneficial to the improvement of the optical properties of the coating. It is thus possible to improve the optical properties of AlO-SiO coating via the optimization of the melting state, microstructure and phase composition of the powder.

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