Ultra-hard composite layers on metal surfaces and method for producing the same
AssigneeEpg (Engineered Nanoproducts Germany) AG
InventorsMartin Mennig, Helmut Schmidt
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Abstract
The invention relates to a metal substrate comprising an ultra-hard composite layer consisting of an inorganic, vitreous matrix containing one or more abrasive fillers. According to the invention, the diameter of the filler particles or, if the filler particles have a platelet-type form, the thickness of the filler particles is less than the layer thickness of the composite layer.
Claims22
A metal substrate having a composite layer thereon, wherein the layer is an ultrahard composite layer comprised of an inorganic, vitreous matrix which comprises abrasive filler having a Mohs hardness of at least 7 and comprising at least one platelet-shaped filler having a platelet thickness which is less than a thickness of the composite layer and at least one filler which is not platelet-shaped and has a diameter that is less than a thickness of the composite layer, a proportion of the abrasive filler in the composite layer being from 1% to 35% by weight, based on a total weight of the composite layer.
A process for producing a metal substrate having an ultrahard composite layer, wherein the process comprises applying a coating composition comprising at least one of a hydrolyzate and condensate of a hydrolyzable compound as glass-forming matrix precursor and abrasive filler having a Mohs hardness of at least 7 to a metal substrate and thermally densifying the coating composition to form the composite layer, the abrasive filler comprising at least one platelet-shaped filler having a platelet thickness which is less than a thickness of the composite layer and at least one filler which is not platelet-shaped and has a diameter that is less than a thickness of the composite layer and a proportion of the abrasive filler in the composite layer being from 1% to 35% by weight, based on a total weight of the composite layer.
Dependencies are inferred from the claim text.