Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

Wear resistant and low friction coatings by thermal spray process

Stamping dies surfaces with dry lubrication properties have been obtained by thermal spraying of composite coatings containing solid lubricant materials. Graphite was selected as lubricant phase; it was mixed with a cermet powder containing a fine dispersion of Chromium Carbide particles in a Nichel-Chrome metallic matrix. Mixtures with different amounts of the two powders were prepared by mechanical mixing before thermal spraying. The coatings materials were deposited by Atmospheric Plasma Spray on steel substrates. Results showed a negligible wear and low friction coefficient which decreases with increasing graphite content. In particular, friction coefficient as low as 0.34 were measured in tribological tests carried out in dry conditions. Graphite content of 35 vol% gave optimal results in terms of wear resistance.

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