Conclusions
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1.
A plasma-deposited 80% Ni-20% Cr alloy coating consists of two phases — the alloy itself and chromium oxide. With increasing spraying range (above 80 mm) the amount of the second phase and the width and length of its inclusions grow, and the condition of the coating/substrate transition zone deteriorates.
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2.
The tensile strength of a nickel-chromium alloy coating is determined by its chromium oxide content.
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3.
The shear strength of a coating depends chiefly on the condition of the coating/substrate transition zone.
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4.
Moving the nickel-chromium alloy wire away from the torch center has a deleterious effect on the quality of coatings.
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5.
The optimum range for the deposition of 80% Ni-20% Cr alloy coatings is 80–100 mm.
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Literature cited
A. S. Nagin, O. B. Chevela, et al., “Microanalysis of plasma-sprayed Kh20N80 alloy coatings,” Poroshk. Metall., No. 4, 97–101 (1975).
A. Hasui, Spray-Deposition Technology [Russian translation], Mashinostroenie, Moscow (1975).
O. B. Chevala and L. M. Orlova, “Formation of plasma coatings on steel and titaniumalloy surfaces,” Poroshk. Metall., No. 12, 26–34 (1968).
O. B. Chevela, L. M. Orlova, and I. A. Morozov, “Shear strength of plasma-sprayed coatings,” Poroshk. Metall., No. 8, 83–86 (1970).
G. Büttner, “Zur Verfahrenstechnik beim Plasmaspritzen und einigen Eigenschaften plasmagespritzter Schichten,” Schweisstechnik (DDR),15, No. 4, 171–176 (1965).
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Translated from Poroshkovaya Metallurgiya, No. 3(183), pp. 95–100, March, 1978.
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Chevela, O.B., Orlova, L.M., Ryabich, L.M. et al. Structure and mechanical properties of plasma-sprayed 80% Ni-20% Cr alloy coatings. Powder Metall Met Ceram 17, 242–246 (1978). https://doi.org/10.1007/BF00791438
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DOI: https://doi.org/10.1007/BF00791438