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Comparative Study on Nano-Structural and Traditional Al2O3-13TiO2 Air Plasma Sprayed Coatings and their Thermal Shock Performance

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Abstract:

This paper reports a comparative study on characterization and thermal shock behavior of air plasma sprayed Al2O3-13wt.%TiO2 coatings using two kinds of raw materials, i.e. nanostructural and micro-structural (traditional) feedstock powders. The characterization, before and after thermal shock test, was carried out using micro-Vickers hardness tester, XRD and SEM. The thermal shock test was carried out using a water quenching method by employing cyclic heat treatment between ambient temperature and 650°C in air. The results showed that in spite of having denser structure, the nanostructural coating showed hardness a little lower than the traditional one at both conditions of before and after thermal shock tests. However, the nanostructural coating showed very good thermal shock behaviour.

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Periodical:

Key Engineering Materials (Volume 739)

Pages:

103-107

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.739.103

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Online since:

June 2017

Authors:

Sun Hui Yao*, Yan Liang Su, Hung Yu Shu, Chia I Lee, Zong Ling You

Keywords:

Air Plasma Spray, Al2O3, Thermal Shock, TiO2

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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