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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v6.i4.50
14 pages

PULSED PLASMA DEPOSITION OF OXIDE HARD COATINGS

R. Cremer
Lehrstuhl fur Theoretische Huttenkunde, RWTH Aachen, 52056 Aachen; and CemeCon AG, Adenauerstr. 20 В 1, 52146 Wurselen, Germany
K. Reichert
Lehrstuhl fur Theoretische Huttenkunde, RWTH Aachen, 52056 Aachen, Germany; now with: ALSTOM (Switzerland) Ltd, 5401 Baden, Switzerland
G. Erkens
CemeCon AG, Adenauerstr. 20 B 1,52146 Wurselen, Germany
Dieter Neuschutz
Lehrstuhl fur Theoretische Huttenkunde, Rheinisch-Westfalische Technische Hochschule (RWTH) Aachen, D-52056 Aachen, Germany

ABSTRACT

In the last years a variety of plasma sources have been developed for film deposition by magnetron sputtering. In addition to RF- and DC-sputter sources, pulsed plasma sources are gaming increased attention in sputter technology. This interest is driven by the wish of depositing coatings with superior properties as compared to those deposited by conventional techniques. One prominent example of coatings that are significantly enhanced by the usage of pulsed sputter deposition is alumina. Although crystalline a-alumina can be deposited by thermal CVD at temperatures above 1000 °C for two decades, no process for the deposition of crystalline alumina at low temperatures is commercially available up to now.
In this paper, the results of a detailed study of the plasma parameters during bipolar pulsed magnetron sputtering and their effect on the properties of alumina hard coatings is reported. Langmuir type voltage measurements at the substrate position, optical emission spectroscopy as well as mass spectroscopy were used to monitor the effect of target poisoning on the reactive deposition of alumina. Those principal observations were connected to easily available process parameters like discharge voltage and oxygen partial pressure. Based on these measurements, the deposition of crystalline g-alumina with high hardness and good adhesion under technical conditions was achieved.


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