Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1995-04-20
1999-04-27
Turner, Archene
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
407119, 57307, 57309, 427249, 4272552, 427307, 427309, 427450, 427576, 427578, 427585, 428212, 428336, 428457, 428469, 428472, 428446, 428697, 428698, 428699, 428408, C23C 900, C23C 1626
Patent
active
058979425
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an at least partly coated body, comprising a substrate of a multiphase material as well as at least one diamond coating. In addition, it relates to a method for its manufacturing and uses of such body.
Appendix A belongs to the specification.
DEFINITIONS
A multiphase material is a material which consists of more than one phase which phases belong either to the same compound or belong to different compounds. In the case of different compounds, the compounds may have elements in common or not. Thus, e.g. hardened steels, cermets and especially cemented carbide materials are considered as such multiphase materials.
If a diamond coating is applied on a body of a multiphase material, there does not result a step-like transition from the substrate material to the diamond coating material, but a material transition along the so-called "interphase". This interphase, which may have a width of some =m, but which may also be thinner, comprises material components of the substrate material and of the diamond coating with the concentrations thereof varying when considered in a direction perpendicular to the coated surface of the body. Thus, the material composition in the interphase is neither equal to the material composition of the substrate nor to the material composition of the diamond coating.
In contrast thereto stands
which is a layer which comprises neither the substrate material nor the diamond coating material.
Under the term "metalloid" non-metals and semi-metals, especially B, Si, Ge, S and P are understood.
Until this date, only a few methods are known for applying diamond coatings on substrate bodies of multiphase material, so that the diamond coating firmly adheres to the body. With respect to the problems encountered with such an attempt, reference is made to e.g. J. D. de Stefani, "Tooling and Production", July 1993, p. 27 ff.
An attempt for improving the adherence of diamond coatings was to provide a single-phase unitary intermediate layer, i.e. at least some atomic layers of a certain material on the surface of the substrate prior to diamond layer deposition- For example the EP-A-0 166 708 proposes to apply an adhesion improving intermediate layer on the body before applying the diamond coating. Thereby, a material is chosen which is different from the substrate material and from the diamond coating material, as is required per definition for an intermediate layer. As an intermediate layer material a metal of the groups IVb to VIb of the periodic system is used, thereby preferably Ti or a carbide, nitride, carbonitride, oxicarbide, oxide or boride of one of the said metals or a noble metal.
Further, reference is made to the EP-A-0 384 011.
Application of intermediate layers was successful with respect to the achievement of a good adhesion. However, for a good wear resistance not only a good adhesion is necessary, but also other properties, such as high ductility and a high shearing strength. The diamond coating as well as the substrate are normally optimized so as to fulfill said mechanical requirements. If, additionally, an intermediate layer is applied, this leads to significantly more complicated considerations with respect to such optimization.
Application of a metallic intermediate layer leads e.g. to a zone of significantly reduced shearing strength, so that, if such a coated body is used as a tool, especially as a cutting tool, loss of the coating will rapidly occur at the most exposed areas of the tool, as e.g. at the cutting edges. Similar effects may be observed when intermediate layers of metalloids are applied.
From the Japanese Kokai No. 5-65646 it is further known to provide a macroscopic intermediate layer of an intermetallic compound with a thickness up to 100 .mu.m between the substrate material and the diamond coating. Thereby, the intermediate layer may be realized as a surface layer in the substrate or may be applied on the surface of the substrate. By means of such an intermediate layer, the adherence of the diamond coating is
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Bergmann Erich
Karner Johann
Pedrazzini Mauro
Reineck Ingrid
Sjostrand Mats E.
Balzers Aktiengesellschaft
Turner Archene
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