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Performance of the Glass-Ceramic Coating Prepared by Slurry Spraying Technique

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Abstract:

The SiO2-BaO-CaO-MgO-ZnO glass-ceramic (GC) coating was prepared on the surface of the nickel based alloy GH140 by slurry spraying technique. Morphology, phase and elemental composition of the glass-ceramic before or after isothermal oxidation for 96h at 1000°C were investigated by SEM, XRD and EDX,. Results showed that the glass-ceramic was mainly composed of BaSiO4 and MgCrO4, and the amount of them both increased after being oxidized for 96h. Compared with bare GH140, GC/GH140 presented a pretty good antioxidant capacity. Before oxidation, white elongated crystals were homogeneously distributed in the glass phases, and a thin transitional layer had already been formed between glass-ceramic and substrate. During the oxidation process, the surface morphology of GC/GH140 became coarse, and small black Si-rich crystals appeared and well-distributed in the coating. Meanwhile, Cr and Ti in the substrate diffused to the interface, which lead to the formation of an oxide-rich interface that protected the substrate from further oxidation.

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Periodical:

Advanced Materials Research (Volumes 779-780)

Pages:

47-51

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.779-780.47

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Online since:

September 2013

Authors:

Hai Bo Hu, Yang Jia, Zhen Qi Fang, Hong Ming Zhou

Keywords:

Glass-Ceramic, Oxidation Resistance, Slurry Spraying, Transitional Layer

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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