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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/3947

Title: CHARACTERIZATION OF TIN COATINGS DEPOSITED ON PLASMA NITRIDED TOOL STEEL SURFACES
Authors: VANSTAPPEN, M
Malliet, B.
ROOS, JR
CELIS, JP
STALS, Lambert
DE SCHEPPER, Luc
Issue Date: 1991
Publisher: ELSEVIER SCIENCE SA LAUSANNE
Citation: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 140. p. 554-562
Abstract: Wear-resistant TiN coatings deposited on tool steels are used frequently in industry. There is a trend towards further optimizing these coatings, e.g. by plasma nitriding the tool surface prior to TiN deposition. In this work the influence of the nitriding conditions on the surface properties of AISI 304 and ASP 23 tool steels was investigated. The plasma nitriding was carried out in a triode ion plating configuration normally used to deposit TiN coatings. At the surface of AISI 304 stainless steel, only a thin compound layer (Fe4N, Fe3N) was found, probably as a consequence of the rather slow nitrogen diffusion in the austenite matrix. For ASP 23 high speed steel, the different nitriding behaviour of the martensitic matrix causes the formation of a diffusion layer which results in an increase in hardness at the surface. On an analogous set of specimens the TiN deposition was started immediately after the plasma nitriding. To optimize this combined treatment, the influence of the nitrogen content of the nitriding medium and that of the thickness of an intermediate titanium layer were examined. By means of X-ray diffraction only an influence on the lattice parameter of TiN and the nitriding layers was found. as compared with the lattice parameter for the separate treatments. Bad adhesion of TiN coatings on plasma nitrided AISI 304 was observed and was explained in terms of the high internal stresses in the compound layer on the nitrided surface. For the ASP 23 substrate a better coating adhesion was observed, probably due to a different structure of the nitriding layer and to the enhanced substrate hardness. At this stage of the research, none of the above-mentioned nitriding treatments results in a sufficient adhesion of the TiN layer, although some useful facts could be established for further research.
Notes: LIMBURGS UNIV CENTRUM,DIV MAT PHYS,MAT RES INST,B-3590 DIEPENBEEK,BELGIUM. KATHOLIEKE UNIV LEUVEN,DEPT MET & MAT ENGN,B-3001 LOUVAIN,BELGIUM.VANSTAPPEN, M, SCI & TECH CTR MET WORKING IND,UNIV CAMPUS,B-3590 DIEPENBEEK,BELGIUM.
URI: http://hdl.handle.net/1942/3947
DOI: 10.1016/0921-5093(91)90478-6
ISI #: A1991GF27200021
ISSN: 0921-5093
Type: Journal Contribution
Appears in Collections: Research publications

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