Abstract

This paper discusses the relationships between the splat structure and the cohesive and adhesive forces of the layers. The shape and size of splats were examined with a quantitative scanning electron microscope (SEM) examination of the layer surface. Surface morphology was characterized by the distribution of shape and dimension of each splat from the SEM images. The morphologies were quite different among the splats at the center of the spray pattern and those at the peripheral area. The splat morphology at the center of the spray pattern was consisted of the wide spread irregular shaped splats. Cohesive-adhesive strength of coatings sprayed with ordinary process and with the particles passing through the central area of spray pattern were compared. Results obtained show us the splats sprayed with the slit have superior cohesive-adhesive properties compared with those passing through peripheral area of the spray pattern, as expected. Paper includes a German-language abstract.

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