Tribological behaviour of plasma-sprayed Al2O3 coatings under severe wear conditions

✍ Scribed by D.I Pantelis; P Psyllaki; N Alexopoulos

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 811 KB
• Volume: 237
• Category: Article
• ISSN: 0043-1648
• DOI: 10.1016/s0043-1648(99)00324-5

✦ Synopsis

Plasma-sprayed alumina coatings are widely used as wear resistant coatings on a variety of metallic substrates. However, the particular Ž . structures of plasma-sprayed coatings lamellar microcracks, unmolten particles, weak interfaces and high porosity affect their mechanical properties and consequently their tribological behaviour. The present work deals with the wear behaviour of a 450 mm thick Ž . Ž . Al O coating deposited on spheroidal graphite S.G. cast-iron substrate by Atmospheric Plasma Spraying APS . Wear tests were 2 3 Ž Ž . carried out under severe conditions normal force varying from 50 to 160 N, sliding speed: 1.40 mrs and average relative humidity RH : . 60% , using as a counterbody a quenched D2 tool steel. The microstructural characteristics of the ceramic coating were correlated to the evolution of both the friction and the wear coefficients and to the wear mechanisms involved.