Coating method and coated element
First Claim
1. Element having a substrate of a hard metal or cermet comprising hard material particles and binding material and a diamond layer, wherein the diamond layer is disposed over a first region of intact substrate material within which hard material particles are surrounded by binding material wherein the transition region of the first region, which is disposed towards the diamond layer, comprises a depth profile having indents and elevations, and wherein the diamond layer is braced with the substrate material such that portions of the diamond layer are disposed deeper in the substrate than elevations of the first region characterised in that:
- between the first region and the diamond layer there is disposed a porous zone in which hard material particles are free of binding material and wherein the hard material particles form an intact hard material particle structure within the porous zone and are not weakened at the grain edges by etching.
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Accused Products
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. The hard material particles located within the porous zone (12) are removed by means of microbeams or a second, WC-selective etching step. A cobalt concentration on the surface is finally removed in a Co-selective etching step, and the substrate (10) is coated with a diamond layer by means of CVD.
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Citations
21 Claims
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1. Element having
a substrate of a hard metal or cermet comprising hard material particles and binding material and a diamond layer, wherein the diamond layer is disposed over a first region of intact substrate material within which hard material particles are surrounded by binding material wherein the transition region of the first region, which is disposed towards the diamond layer, comprises a depth profile having indents and elevations, and wherein the diamond layer is braced with the substrate material such that portions of the diamond layer are disposed deeper in the substrate than elevations of the first region characterised in that: -
between the first region and the diamond layer there is disposed a porous zone in which hard material particles are free of binding material and wherein the hard material particles form an intact hard material particle structure within the porous zone and are not weakened at the grain edges by etching. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Method for coating a substrate material with a diamond layer wherein the substrate material contains hard material particles and binding material wherein
a binding material-selective etching is executed in a first step, wherein the binding material in a border zone of the substrate is removed, a hard material-selective etching is executed in a second step, wherein the hard material particles in the border zone are completely removed so that a surface profile with elevations and indents is created, a binding material-selective etching is executed in a third step, wherein a binding material concentration on the surface is removed, and the substrate is coated with a diamond layer thereafter.
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12. Method for coating a substrate material with a diamond layer (wherein the substrate material comprises hard material particles and surrounding binding material wherein
in a first step a selective etching of the binding material is executed, hard material particles are removed in a subsequent mechanical removal step by means of a blasting process with blasting particles, and the substrate is afterwards coated with a diamond layer.
Specification