METALLIC ARTICLE PROVIDED WITH A WEAR AND CORROSION RESISTANT PROTECTIVE COATING OF TUNGSTEN CARBIDE

摘要

1. A metal part which is provided with a wear and corrosion resistant tungsten carbide protective layer and which consists of aluminium or copper or their alloys, and which has a relatively low hardness and a relatively high coefficient of thermal expansion alpha, at least one intermediate layer being provided between the metal part and the protective layer, characterised in that the intermediate layer (2; 2a, 2b) has a thickness of at least 20 mu m, and also its hardness is greater than that of the metal part (1) but lower than that of the tungsten carbide (3) and its thermal expansion is lower than that of the metal part (1) but greater than that of tungsten carbide (3).