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AssigneeWidia GmbH
InventorsKlaus Rödiger, Hartmut Westphal, Klaus Dreyer, Thorsten Gerdes, Monika Willert-Porada
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The invention concerns a composite body consisting of a hard metal, cermet or ceramic substrate body and at least one layer of a mechanically resistant material, a ceramic substance, a diamond-like layer, amorphous carbon and/or hexagonal boron nitride. The invention also concerns a method of producing this composite body, wherein, when the green compact has been dewaxed, with its pores still open and whilst it continues to be heated as from a temperature of between 600° C. and 1100° C., it is acted upon by sublimable solids and/or reaction gases which are necessary for coating purposes. The temperature of the green compact is then further increased and the latter is fully compressed by sintering, before one or more layers of the above-mentioned type is/are applied.
A method of producing coated cermet, hard-metal or ceramic substrate bodies comprising the steps of:
A composite body consisting of a hard metal, cermet or ceramic substrate body and at least one layer of a hard materials, ceramic material, a diamond-like layer, amorphous carbon and/or hexagonal boron nitride on the substrate body, wherein in a zone bordering the layer, in the substrate body materials like that of the layer adjacent the substrate body are embedded with an inwardly decreasing gradient to a penetration depth of a maximum of 200 μm, and a border surface between the substrate body surface and the layer has a roughness which corresponds approximately to the roughness of a partially densified green compact with an open porosity at 600° C. to 800° C. prior to sintering.
Dependencies are inferred from the claim text.