METHOD FOR SPRAYING COATING ON INTERNAL SURFACE OF TUBULAR ARTICLES Russian patent published in 2002 - IPC

FIELD: gas thermal and plasma spraying of coatings on articles used in mechanical engineering, metallurgy, etc. SUBSTANCE: method involves spraying coatings in parallel strips offset one with respect to another by providing rotating and progressive movements of sprayer and article one relative to another, with strips being arranged discretely on surface under process; turning article along its axis after termination of each sprayer pass; offsetting each strip relative to previous strip in overlapping relationship after each full turning of article around its axis while further increasing angle of rotation of article. Method allows adhesion between base and sprayed coating to be enhanced by eliminating reasons causing reduction in adhesion and by minimizing occurrence of coating tearing force due to thermal shrinkage. EFFECT: wider range of usage and improved quality of sprayed coating. 3 cl, 1 dwg, 2 ex