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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/3882

Title: RECENT PROGRESS IN THE STUDY OF PHYSICALLY VAPOR-DEPOSITED COATINGS PRODUCED BY MEANS OF HIGHLY IONIZED PLASMAS
Authors: VANSTAPPEN, M
STALS, Lambert
QUAEYHAEGENS, Carl
Issue Date: 1992
Publisher: ELSEVIER SCIENCE SA LAUSANNE
Citation: SURFACE & COATINGS TECHNOLOGY, 54(1-3). p. 121-130
Abstract: To the existing data on the effects of substrate temperature, bias voltage, substrate current density, and deposition rate on the microstructure of hard physically vapour-deposited coatings, this paper adds new results on these phenomena, obtained by means of X-ray diffraction in Field-Merchant reflection mode for physically vapour-deposited TiN on AISI 304 and AISI H13 substrates. It could be shown that there is a combined effect on the preferential orientation of the coating of the nature of the substrate surface (metallurgical composition and preferential orientation) on the one hand and of the energy deposition per condensing atom on the other hand. Although the substrate surfaces of both materials are preferential orientation free, the coating starts to grow on AISI H13 without any preferential orientation independent of the applied voltage V=V(b)-V(p) (V(b) is the bias voltage, and V(p) the plasma potential) in the range [-60 V, -160 V], as could be expected, whereas on AISI 304 a (200) orientation develops. At larger thickness (about 1.5 mum)a(220)-(111) texture is observed for both substrate materials with a mosaic spread of about 8-10-degrees for both orientations, except for the -60 V case for AISI H13, where a mosaic spread of about 34-degrees is observed for the (111) orientation, and for the -60 V case for AISI 304 where the initial (200) texture has survived with a small increase in mosaic spread to about 9-degrees. Data on the internal macroscopic residual stresses for TiN on AISI H13 show that they are compressive and that they decrease with decreasing energy deposition. Because in this case a larger mosaic spread of the preferential orientation is observed at lower energy depositions, this indicates the effect that mosaic spread may have on internal stresses. It is also observed, on samples of ASP 23, that properties such as hardness and conformal cracking in a scratch test are changing with the amount of compressive stress in such a way that real functional properties, such as wear resistance, might deteriorate with decreasing compressive stress. Finally, the analysis of (d(hkl), sin2 psi) curves, which is made in order to determine the amount of stress in the coating, has shown that the observed psi+-psi-splitting can, in the present case, largely be explained on the basis of the observed preferential orientation.
Notes: SCI & TECH CTR MET WORKING IND,B-3590 DIEPENBEEK,BELGIUM.STALS, LMM, LIMBURG STATE UNIV CTR,INST MAT RES,DIV MAT PHYS,SCI PK,UNIV CAMPUS,B-3590 DIEPENBEEK,BELGIUM.
URI: http://hdl.handle.net/1942/3882
ISI #: A1992KA58500021
ISSN: 0257-8972
Type: Journal Contribution
Appears in Collections: Research publications

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