Abstract: A description is given of a coated body and a method for producing and coating a body. The body has a substrate of a hard metal or cermet, comprising hard material particles (1) and binder material (2) and an adhering diamond layer (4) provided on top. At least some of the hard material particles (1) on the surface of the substrate and under the diamond layer (4) have transcrystalline depressions in the form of holes. The substrate may consist of hard metal, preferably consisting of WC and Co. A CVD diamond layer may be applied to the functional surfaces. In the case of at least one of the diamond-coated functional surfaces, the cobalt content of the surface, specified in % by weight, in relation to the WC, measured by means of energy-dispersive X-ray fluorescence, is only reduced by a maximum of 50% in comparison with the untreated substrate.

Abstract: Disclosed are an element comprising a hard metal substrate (10) and a diamond layer (30), and a method for coating a hard metal substrate (10). Said hard metal substrate is provided with hard material particles (20) and surrounding binder material (22). The hard material particles (20) are surrounded by binding material (22) in a first area (24) comprising intact hard metal. The transition region of the first area (24) encompasses a deep profile having recesses (18) and elevations (16). The diamond layer (30) is braced with the substrate material (10) with the aid of said deep profile, portions of the diamond layer (30) being disposed deeper within the substrate (10) than elevations (16) of the first area (24). Said structure is obtained by means of a pretreatment process in which a hard metal substrate (10) is first subjected to selective etching in order to remove the binding material (22). A porous zone having a deep profile is formed.