Widia Gmbh

Fried Krupp

Kennametal Inc.

Krupp Widia Gmbh

Ralf Tabersky

Udo Konig

Hendrikus Van Den Berg

Hartmut Westphal

Norbert Reiter

Josef Blum

Volkmar Sottke

Mirjam Arndt

Udo Ko/ Nig

The invention relates to a process for coating a substrate composed of cemented carbide, a cermet, steel or ceramic with at least one TiAlN layer by means of a DC sputtering process. The invention further relates to a workpiece or tool which has been coated by the above-described process and to the use thereof. It is an object of the present invention to provide a process by means of which it is possible to produce coatings which combine the advantages of the sputtering process and the arc process, i.e. to make it possible to obtain a coating which has a low roughness and an advantageous (200) texture. A further object of the present invention is to provide a workpiece which has a coating having the properties mentioned. A further object of the present invention is to use tools which are particularly suitable for machining metals. The object achieved by the process is distinguished by ionization aids being used for increasing the plasma densities.

Coating process, workpiece or tool and its use

Cutting tool, process for coating a cutting tool and use thereof

Composite body and process for its production

Tool and process for coating a basic tool component

In order to improve the wear characteristics of tools with diamond cutting edges, it is proposed to coat the diamond body with a 0.5 to 6 .mu.m thick layer of at least one oxide of the metals zirconium and/or yttrium and/or magnesium and/or titanium and/or aluminum, preferably aluminum oxide. The coating is deposited from the gas phase at gas-phase temperatures up to 800.degree. C. Preferably the pulse-plasma CVD process is used for the coating. The diamond tools so coated are particularly suited for chip-forming machining of carbon-affinitive materials, such as iron-containing materials or steel.

Tool with diamond cutting edge having vapor deposited metal oxide layer

Composite body and its use

Composite body, its use and a process for its production

Tool with wear-resistant cutting edge made of cubic boron nitride or

Chemical vapor deposition apparatus and method wherein a corona

A tool having an extended service lift and including a hard metal body, and at least one surface layer composed of at least one hard substance selected from the group consisting of carbides, nitrides, and carbonitrides of titanium and zirconium, and having a chlorine content ranging from a finite amount up to 4 mass percent, the tool being produced by plasma-activated CVD process including: a. positioning the hard metal body in a CVD chamber having means for supplying direct voltage thereto, the hard metal body being connected to the direct voltage supplying means as a cathode thereof, b. introducing into the CVD chamber a reactive gas mixture including a nitrogen-containing substance, a carbon-containing substance, and at least one compound containing at least one of titanium and zirconium, and c. exciting plasma formation at the hard metal body and coating same by chemical vapor deposition by applying a pulsed direct voltage and a residual direct voltage thereto, the residual direct voltage having a magnitude which is at least equal to the lowest ionization potential of any gas in the reactive gas mixture but does not exceed 50% of the maximum value of the pulsed direct voltage.

Tool produced by a plasma-activated CVD process

Plasma CVD process for coating a basic metallic body with a

A plasma-activated CVD process provides improved adhesion of the coated surface layers and employs, as the plasma exciting source, a pulsed direct voltage and a residual direct voltage which remains during the pulse intervals. The residual direct voltage is equal to or greater than the lowest ionization potential of the gases participating in the CVD process, but is no more than 50% of the maximum value of the pulsed direct voltage. The total thickness of the layer(s) does not exceed 30 .mu.m and the temperature of the basic tool body during the coating process is reduced, compared to prior art plasma CVD processes, and ranges from between 400.degree. to 800.degree. C., and is preferably kept below 600.degree. C.

Plasma CVD process for coating a basic tool body

Growing community of inventors

Bottrop, Germany

Ralf Tabersky