A Definition of the Topography of Grit-Blasted Surfaces for Plasma Sprayed Alumina Coatings

[+] Author and Article Information
B. J. Griffiths

Manufacturing and Engineering Systems Dept., Brunel University, Uxbridge, Middlesex, England UB8 3PH

D. T. Gawne

School of Engineering Systems and Design, South Bank University, London, England SE1 0AA

G. Dong

Materials Engineering Dept., Brunel University, Uxbridge, Middlesex, England UB8 3PH

J. Manuf. Sci. Eng 121(1), 49-53 (Feb 01, 1999) (5 pages) doi:10.1115/1.2830574 History: Received August 01, 1994; Revised December 01, 1997; Online January 17, 2008


This paper describes the topographical implications of grit blasted surfaces on plasma sprayed alumina. The transition of the grit blasted surface from raw material to correctly blasted is described in terms of surface heights, height distribution, spacings and texture. The influence of embedded grit is shown to be significant. The individual particles of alumina impacting the surface are classified into two types, these being disc splats and splash splats. Their deposition relationships with regard to surface topography and adhesion is explained with reference to the two types of splat.

Copyright © 1999 by The American Society of Mechanical Engineers
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