Influence of critical parameters on the properties of plasma sprayed coatings prepared from spray dried alumina powder

Aruna, ST and Balaji, N (2014) Influence of critical parameters on the properties of plasma sprayed coatings prepared from spray dried alumina powder. Transactions of the Indian Ceramic society, 73 (4). pp. 1-6. ISSN 0371-750X

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Abstract

Plasma sprayable -alumina powder was prepared by spray drying process. The powder was characterized by field emission scanning electron microscopy (FESEM), powder X-ray diffractometry, particle size analysis and flowability measurement. In the present work, the influences of three different critical plasma spray parameter (CPSP) values (675, 825 and 937.5 W/nl.pm) on the crystallographic forms, microstructure, microhardness, surface roughness, wear and corrosion resistance of the plasma sprayed alumina coatings were investigated. The coatings were characterized by X-ray diffractometry and the analysis revealed the presence of some traces of -alumina along with -alumina for the coating obtained at higher CPSP. The surface roughness, microhardness, corrosion and wear resistance of the coatings were evaluated. Plasma sprayed alumina coating obtained at the highest CPSP exhibited improved wear and corrosion resistance compared to the other two coatings which is attributed to the dense nature of the coating.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s. The Indian Ceramic Society
Uncontrolled Keywords:	Alumina;Spray drying;Plasma spraying;Wear;Microstructure
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User:	Ms. Alphones Mary
Date Deposited:	20 Jul 2015 05:00
Last Modified:	20 Jul 2015 05:00
URI:	http://nal-ir.nal.res.in/id/eprint/12221

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