Innovative Methode zur Partikelklassifizierung beim thermischen Spritzen

Innovative particle characterization method for thermal spray processes Coatings produced by thermal spray processes are determined by particle parameters, which can be investigated using various diagnostic systems. With the newly developed PSI (Particle Shape Imaging) four (velocity, size, shape and position) important particle parameters can be measured and evaluated. The data acquisition system consists of two separate optical setups, thus a single particle produces two pictures in the lower and upper area of an ICCD‐Camera. These pictures are evaluated by assigning specially developed shape and size parameters to the particles, which, in combination with the velocity, can be used to predict the coating quality. This instrument can be used to determine the optimum spray parameters (i.e. find the optimal distance between substrate and thermal spray system) and to survey the coating process. A newly developed, mobile PSI‐System will allow operation at industrial and research thermal spray facilities.     

Morphology of syndiotactic polystyrene as examined by small-angle X-ray scattering

Small Angle X-Ray scattering (SAXS) studies have been carried out on injection molded syndiotactic polystyrene (SPS) at room temperature and at elevated temperatures up to 290°C. Features indicating lamellar crystallinity were weak or entirely absent at room temperature, becoming increasingly intense above the glass transition temperature (T_g) for this material. A background scattering whose intensity was roughly proportional to q^?2, where q is the scattering momentum transfer, was present throughout the temperature range. We suggest that these results indicate that SPS materials formed in this way are three-phase systems, with an amorphous phase, a crystalline phase, and a grain boundary phase.