Fabrication of Si₃N₄-based seal coating on porous Si₃N₄ ceramics
by Qiang Shen; Ying Yang; Fei Chen; Lianmeng Zhang
International Journal of Materials and Product Technology (IJMPT), Vol. 42, No. 1/2, 2011

Abstract: In this study, Si₃N₄-based seal coatings using MgO, Al₂O₃ and SiO₂ as the sintering additives were prepared on the porous Si₃N₄ substrates by room temperature spraying and pressureless sintering. The composition of the Si₃N₄-based seal coatings was well designed, in order to both match the coefficient of thermal expansion with that of the porous Si₃N₄ substrate and form the liquid phase at a relative low temperature. During the sintering process, the liquid phases promote the densification and homogenisation of the Si₃N₄-based seal coatings. A good combination between Si₃N₄-based seal coatings and substrate is achieved, as a result of the liquid-phase penetration into the pores in the porous Si₃N₄ substrate.

Online publication date: Sat, 07-Mar-2015

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