|Autors: Kandeva, M. K., Kalitchin, Zh., Stoyanova, Y. P.|
Title: INFLUENCE OF CHROMIUM CONCENTRATION ON THE EROSIVE WEAR OF NI-CR-B-SI COATINGS APPLIED BY SUPERSONIC FLAME JET (HVOF)
Keywords: HVOF coatings, chromium, erosion wear, tribology.
Abstract: The present research work represents comparative results on the erosion wear and erosion wear resistance of coatings, deposited by supersonic flame jet (HVOF), which contain composites having Ni-Cr-B-Si of different chromium concentrations - 9.9%; 13.2%; 14%; 16% and 20%, at identical particle size 45 µm and identical contents of the elements boron and silicon. The coating, prepared having 20% Cr does not contain the elements B and Si. Coatings have been obtained from each powder composite without any preliminary thermal treatment of the substrate and with some preliminary thermal treatment of the substrate up to 650°C. The coatings have been tested under identical conditions of erosion in air stream, carrying abrasive particles. Results have been obtained on the dependence of the mass wear, the intensity of erosion and the erosive wear resistance as a function of the Cr concentration in the coatings with and without thermal treatment of the substrate at two angles of the stream.
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