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Vsesojuzny Nauchno-issledovatelsky Instrumentalny Institut

Igor V Gavrilko

Valentin G Padalka

Anatoly A Andreev

Alexei G Gavrilov

Andrei K Sinelschikov

Viktor P Zhed

Anatoly S Vereschaka

Albert M Boyarunas

Mikhail A Napadov

Vitaly F Drozhin

Vladimir T Tolok

Abram L Sapozhnikov

Anatoly I Grabchenko

Natalia V Alexeenko

Vasily P Panchokha

Anatoly M Kotlyar

Ljudmila V Zhivkova

Jury A Tarasov

Viktor G Lappo

A multilayer coating of metal-cutting tools is composed of alternating layers of two components. One of these is a nitride or carbide of a metal of group IV. The other is a nitride, carbide, boride or silicide of a metal of group VI. The layer thickness of the group IV metal compound is from 0.05 to 0.5 .mu.m, and the layer thickness of the group VI metal compound constitutes 15 to 40 percent of the layer thickness of the group IV metal compound. The multilayer coating is preferably intended for application to metal-cutting tools used for machining high-alloyed materials.

Multilayer coatings of metal-cutting tools

The dental prosthesis comprises a base from a durable corrosion-resistant metallic alloy and at least one external decorative layer. The external decorative layer is made of a harder material than the base and comprises nitrides, oxynitrides, carboxynitrides, cyanonitrides and/or oxides of metals of the subordinate subgroup of Group IV of the periodic system. The thickness ratio of the external decorative layer to the base is equal to 1:10-200 respectively. In the case where the dental prosthesis base comprises a structure of soldered members from a durable corrosion-resistant metallic alloy, the method for making the dental prosthesis comprises manufacture of the base by soldering members of the dental prosthesis from the abovementioned alloy into an integrated structure. Then the zone of the soldered juncture or the entire structure is coated, by electroplating or vacuum technique, with an additional layer from cobalt, nickel, molybdenum, chromium or zirconium, or from nitrides of chromium or molybdenum. The thickness ratio of the additional layer to the external decorative layer is equal to 0.5-1:1 respectively. Thereafter, the external decorative layer is deposited by vacuum technique.

Dental prosthesis and method for making same

Coating for metal-cutting tools

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Kharkiv, Ukraine

Igor V Gavrilko