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: Journal Article
    Additional Information: Copyright to 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)
    Division/Department: Surface Engineering Division, Surface Engineering Division
    Depositing User: Ms. Alphones Mary
    Date Deposited: 22 Dec 2014 13:33
    Last Modified: 22 Dec 2014 13:33
    URI: http://nal-ir.nal.res.in/id/eprint/12058

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