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Coatings 2017, 7(10), 169; https://doi.org/10.3390/coatings7100169

Deposition of Photocatalytic TiO2 Coating by Modifying the Solidification Pathway in Plasma Spraying

1,2
,
1,2
,
1,2,3,* , 2
and
1,2,*
1
School of Materials Science and Engineering, Central South University, Changsha 410083, China
2
National Engineering Laboratory for Modern Materials Surface Engineering Technology, The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510651, China
3
School of Materials and Mechanical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China
*
Authors to whom correspondence should be addressed.
Received: 21 September 2017 / Revised: 9 October 2017 / Accepted: 11 October 2017 / Published: 13 October 2017
(This article belongs to the Special Issue Functional Ceramic Coatings)
View Full-Text   |   Download PDF [4068 KB, uploaded 13 October 2017]   |  

Abstract

The deposition of photocatalytic TiO2 coatings with plasma spraying is attractive for large-scale applications due to its low cost and simplicity, but it is still a challenge to obtain a TiO2 coating with high anatase content. The solidification pathway of inflight melted particles was investigated in the present paper, and TiO2 coatings with enhanced photocatalytic activity were obtained without a significant loss of the microhardness. The coating microstructure, phase composition, and crystallite size were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Photocatalytic performance was evaluated by decomposing an aqueous solution of methylene blue. Results showed that the anatase content in TiO2 coating was augmented to 19.9% from 4%, and the time constant of the activity was increased to 0.0046 h−1 from 0.0017 h−1. View Full-Text
Keywords: photocatalytic coatings; solidification; plasma spraying; TiO2; microstructure photocatalytic coatings; solidification; plasma spraying; TiO2; microstructure
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Wen, K.; Liu, M.; Liu, X.; Deng, C.; Zhou, K. Deposition of Photocatalytic TiO2 Coating by Modifying the Solidification Pathway in Plasma Spraying. Coatings 2017, 7, 169.

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