This paper discusses the gases used in different thermal spraying processes and the factors that determine purity requirements, consumption rates, and working temperature and pressure. It explains how process gases are supplied to and distributed within manufacturing facilities and how gas-handling systems and related equipment are tested for operational suitability and safety. Paper includes a German-language abstract.

The ASM Thermal Spray Society Recommended Practices Committee, through its Subcommittee on Safety, is responsible for the development and dissemination of practical recommendations for thermal spraying work. This paper discusses the guidance set forth in the “Recommended Practice for the Handling and Usage of Gases in Thermal Spraying,” which deals with the installation, operation, and maintenance of gas equipment used in spraying processes. It summarizes the hazards associated with compressed gases and high-pressure cylinders and presents precautionary measures to reduce the risks. Paper includes a German-language abstract.

Chemical reactions between melted materials and their gaseous environment are generally inherent to the thermal spray process. Measures to promote and control these reactions are the distinguishing characteristic of reactive plasma spraying. In this paper, Ti-6Al-4V nitrided coatings are produced by high-pressure reactive plasma spraying. The coatings are deposited at different pressures up to 250 kPa in a reactive nitrogen atmosphere as well as air in order to study the influence of spraying pressure and atmosphere. The microstructure and phase composition of the Ti-6Al-4V layers are examined with the aid of X-ray analysis, microprobe measurements, and electron imaging. The investigations show that the pressure-supported nitrogen application during spraying led to the formation of fine and coarse TiN in the Ti matrix. Paper includes a German-language abstract.