Abstract Electrostatic fluidized bed spraying is a coating process that is often used for coating plastic. A novel flame spray technology with a controlled atmosphere was developed by Air Liquide in order to realize coatings with thermoplastics as well as composite coatings such as plastic/ceramic or plastic/metal. This technology expands the scope of the applications of plastic coatings especially for all types of shapes and materials as well as for on-site coating. Two types of powder, namely Rilsan and Gotalene were used in this study. The tests were carried out by HTI, which is Air Liquide's partner in the development of such applications. After introducing the principle of this process, this paper presents and discusses the coating process and the properties of such coatings. Then the advantages and limitations of the process are highlighted. Paper includes a German-language abstract.

Abstract This paper investigates the degradation of polymers during thermal spraying with special reference to the changes in molar mass. A study is carried out on the degradation of polymethylmethacrylate (PMMA) during plasma spraying. The infrared spectroscopy showed that the coating did not lead to any significant chemical reactions. However, the gel permeation chromatography measurement revealed larger changes in the molar mass with a decrease of up to 70% in the average numerical molar mass of the PMMA. The results show that increasing the arc power resulted in a substantial increase in degradation. Because of the extremely low thermal conductivity of polymers, the magnitude of these effects becomes even worse. The results indicate that it is important to consider molar mass measurements along with spectroscopic analysis when characterizing thermally sprayed polymer coatings. Paper includes a German-language abstract.