Air-plasma spraying of cavitationand hydroabrasive-resistant coatings
V.I. Kuzmin1, I.P. Gulyaev1, D.V. Sergachev1, S.P. Vashchenko1, B.V. Palagushkin2, A.O. Tokarev2, M.G. Menzilova2
1Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
2Siberian State University of Water Transport, Novosibirsk, Russia
Keywords: воздушно-плазменное напыление, плазмотрон с секционированной межэлектродной вставкой, узел кольцевого ввода порошковых материалов, осесимметричный гетерогенный поток, кавитационное и гидроабразивное изнашивание, контактно-импульсные нагрузки, износостойкие покрытия, адгезия, когезия, пористость, air-plasma spraying, plasma torch with a sectioned interelectrode insert, circular input for powder materials, axisymmetric heterogeneous flow, cavitation and hydroabrasive wear, impact loads, wear-resistant coatings, adhesion, cohesion, porosity
Abstract
Results of a study of the air-plasma spraying of cavitation- and hydroabrasive-resistant coatings from powder materials are reported. A method of laboratory (bench) testing of coatings for resistance under pulsed impact loads is proposed. The bench is a laboratory impact tester that strikes an indenter brought in permanent contact with the sample. A measure of the damage inflicted to the surface hardened by a wear-resistant coating is the diameter of the hole produced by the indenter. The moment of coating destruction is the time at which cracks appear in the coating or the peeling occurs. The developed technique of the bench tests for the pulsed impact loading of wear-resistant coatings imitates the operating conditions of the blades of a high-speed propeller of a water-jet propulsion device in shallow water. The method of air-plasma spraying of powder materials as protective coatings was successfully tested when hardening the propeller blades of a water-jet propulsor of a KS-101D river ship.
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