Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1995-05-22
1997-12-16
Turner, Archene
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
428698, 428701, 428702, 2041921, 20419215, 20419222, C23C 1400
Patent
active
056983140
ABSTRACT:
Compound body of a vacuum coated sintered material and a process for its production. Such compound bodies, when coated in a known manner, have a carrier of sintered material coated with a layer that is thermally, mechanically and chemically unstable, with their surface showings cracks and being partially porous. These shortcomings are overcome via an improved eco-friendly vacuum deposition process, wherein at least one layer of a material, having an outer layer of Al.sub.2 O.sub.3, is applied to the carrier of sintered material at a maximum of 800.degree. C., with this layer being completely crystalline and comprised of an .alpha.Al.sub.2 O.sub..sub.3 phase and possibly of a .gamma.Al.sub.2 O.sub.3 phase with a (440) texture, having a compressive stress of at least 1 GPa and a hardness of at least 20 GPa, with the Al.sub.2 O.sub.3 layer being deposited via reactive magnetron sputtering, wherein the magnetrons are pulse driven, the pulse frequency lies between 20 and 100 Khz and the deposition rate is at least 1 nm/s, with the resulting compound bodies being utilized for cutting treatments, particularly as cemented carbide inserts.
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Scherer, Latz, and Patz; Proc. 7th Int. Conf. IPAF, Geneva, 1989, p. 181 et al., entitled "A novel solution for the fast deposition of A1203 by DC reactive magnetron sputtering", cited and described on p. 3 penultimate paragraph, of the instant application.
Bunshah, Schramm; entitled "Alumina deposition by activated reactive evaporation, in Thin Solid Films 40 (1977)", pp. 211-216, cited and described on p. 4, first paragraph, of the instant application.
"Characterization of L-Al.sub.2 O.sub.3, K-Al.sub.2 0.sub.3 :L-k Multioxide Coatings of Cemented Carbides" Thin Solid Films 193/194 (1996) 536-546.
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English Translation of JP-59-to 223 published Sep. 1984.
Fietzke Fred
Goedicke Klaus
Hempel Wolfgang
Hotzsch Gunter
Reschke Jonathan
Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung
Turner Archene
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