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.

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