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Specific surface conditioning with atmospheric plasma

Beschreibung: Modern lightweight design concepts and multi-material mix applications increase requirements in material science and joining technology. Various materials demand specific pre-treatment procedures for high quality welding and bonding results. Next to sophisticated mechanical and chemical surface treatment methods the atmospheric pressure plasma (APP) technology gains in importance. While state of the art systems usually apply gases like air or nitrogen to generate APPs, within the SPOK project a new process will be investigated, which also allows creation of plasma from liquid media. The probably most interesting aspect of APP pre-treatment is the possibility to chemically modify material surfaces. Specific conditioning of surfaces is an important requirement to obtain optimized joining results. The main goal of the SPOK project is to gain fundamental understanding of the specific conditioning of material surfaces applying the new APP process. To achieve this, the influence of important parameters like APP power, APP flow pattern, treatment distance and scan velocity have to be investigated. Special attention should be focused on the chemical composition of media used for APP generation. For characterization of APP treated samples surface sensitive analysis methods like X-ray photo-electron-spectroscopy (XPS) are mandatory for the investigation of the chemical composition of the surfaces and will be applied at ZONA to analyze the APP treated surfaces. More sophisticated methods like electron-loss-spectroscopy and angle-resolved XPS allow measurements of the hydrogen content and chemical depth profiling of APP treated surfaces. In view of possible future analysis methods, which may be integrated directly to the APP process, special optical methods will be evaluated, among them also non-linear-monolayer-sensitive techniques like sum-frequency generation spectroscopy. Final validation of analysis results will be done by means of joining experiments using materials with specifically APP conditioned surfaces. The project is carried out within the "Produktion der Zukunft" programme of the FFG and is running from 2015-2018. Consortium: Fronius International GmbH, ZONA/JKU Project volume: 600.000 € For more information please contact: Assoc.-Univ. Prof. DI Dr. David Stifter email: david.stifter@jku.at