ABSTRACTS
The following is a list of the abstracts for papers which will be presented in THE THIRD INTERNATIONAL SYMPOSIUM ON ADHESION MEASUREMENT OF THIN FILMS AND COATINGS. The listing is alphabetical by presenting author. This list is updated continually to add abstracts as they become available and make appropriate corrections. This list may be conveniently searched by using the editor provided with most popular browsers (e.g. Microsoft Explorer, Netscape, ... etc.)
Assessing the Adhesion of Hard, Carbon-based Coatings
(Abstract not yet available)
Determination of the Elastic Parameters and of the Tensile Strength of an Intermetallic Thin Layer Obtained by Solid State Reaction
A thin intermetallic layer was obtained by a solid state reaction (Al/Ti). In order to analyse it's mechanical stability (cracking/deadhesion...), we determined first, the intrinsic elastic parameters of the layers (consisting and reactive) by acoustic surface wave propagation; then second, from XR diffraction experiments, we determined the evolution of the residual stresses in the consisting layers at different stages of the layer growth. By using these experimental determinations, and considering an energy balance approach, which takes into account the generation of cracks in the formed layer, we deduced the sensitivity of the material to fail and debond, and its tensile strenght. Cracking models and experimental results will be presented and discussed.
and Enrico Traversa2
1) Department of Mechanical Engineering - Tohoku University, Aramaki aza Aoba 01, Aoba-ku, Sendai 980-8579 (JAPAN)
20 Dipartimento di Scienze e Tecnologie Chimiche - Università di Roma "Tor Vergata", Via della Ricerca Scientifica - 00133 Roma (ITALY)
Quantitative Evaluation of the Interface Toughness Between CVD Diamond and Co-Cemented Tungsten Carbide
The development of CVD diamond coated Co-cemented tungsten carbide (WC-Co) tools requires the achievement of film to substrate adhesion levels as high as possible. The evaluation of adhesion by conventional methods, such as indentation and scratch test, allows only to roughly compare the effectiveness of different substrate pretreatments and/or deposition conditions. However, these methods do not offer a quantitative evaluation of CVD diamond adhesion to the substrate.
New adhesion testing procedure have been designed and applied by the Authors to get quantitative values of interface toughness of CVD diamond to WC-Co. Adhesion of both discrete particles and continuous films can be evaluated. Our data put into evidence the role of substrate pretreatment and interface morphology in determining interface toughness ranging from around 10 up to 37 J/m2.
The possibility offered by the new method to quantitatively determine diamond adhesion to WC-Co will bring a significant advantage for the development of films and coatings with larger adhesive strength by giving quantitative evaluation of the effects of treatments which are being expected to enhance adhesion.
Xingfa Ma, Yuanjun Liu, Fenghua Song , Lei Tang, Zhongping Wang and Jianguo Wang; Shandong Institute of Non-metallic Materials, P.O.Box 108,Jinan250031, Peoples Republic of China
Studies on the Interface of Rubber-to-Metal Bonded Composite with SEM
To explain the adhesion mechanism of metal-to-rubber and examine the key factors affecting the anisotropic peel behavior of metal-to-rubber bonding assembly, the double oriented peel behavior of metal-to-rubber bonded composite in vulcanization were investigated, and the different cross-sections and the several peel failure surfaces (100R region, stick region, slip region etal.) of the same adhesion sample were observed with scanning electron microscopic. The results indicated that the boundary between adhesive layer and bonded rubber was not distinguished, and the interface between adhesive layer and the metal was relatively clear. For some adhesion regions, the combination of metal and adhesive layer is inseparable, and for the other, slight gaps between adhesive and the metal were observed clearly. The contribution of these compact and loose bound regions markedly depends upon the different cross-section of the same bonding body, for some cross-sections, these strong and weaken interface region appeared alternatively. This phenomena is obviously correspondence to stick-slip mode peel intermittent failure modes.
Dynamical Simulation Test Studies of Metal-to-Rubber Bonding in Vulcanization Composites
To predict the lifetime of metal-to-rubber adhesive bonding composite in service, the dynamical properties of metal-to-rubber adhesive bonding assemblies were investigated by DMTA and Vehicle Dynamics Test Systems, its internal heat buildup characteristics were determined under the composite applied several alternative stress, and the mechanical properties, the heat conductive properties and crosslinking densities of the bonded rubber were presented. The results indicated that, the heat produced internal is one of the key factors affecting its durability, and was strong dependence upon the crosslinking densities, the heat conductive properties and Tg value of the bonded rubber.
Influence of Interlayers and Microstress on Adherence of Tin Films
(Abstract not yet available)