Automatic Welding, 2022, №10



2022 №10 (06)

DOI of Article 10.37434/as2022.10.07

2022 №10 (01)

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Avtomaticheskaya Svarka (Automatic Welding), #10, 2022, pp. 47-53

Specialized plasma devices for producing gradient coatings by plasma powder spraying

V.M. Pashchenko

NTUU «Igor Sykorsky Kyiv Polytechnic Institute». 37 Peremohi Ave., 03056, Kyiv, Ukraine. E-mail: vn.paschenko@ukr.net

A plasma device for plasma-powder spraying of multilayer, composite and gradient coatings was studied. Experimental studies of energy characteristics of plasma arc generator with curvilinear arc channel were performed at operation in plasma-generating air with the purpose of proving the principal possibility of its long-term service with acceptable energy and life characteristics. It is shown that losses into the plasmatron structure elements depend on arc current and plasma gas flow rate, and the nature of this dependence does not differ in principle from regular plasmatrons: the losses increase with current rise and somewhat decrease at increase of gas flow rate. Volt-ampere characteristics of plasma generator are drooping. However, the presence of arc channel bend as a factor stabilizing the arc length, leads to appearance of a neutral region of VAC with a certain tendency to increase at current rise. Here, the stable operation range is limited by arc current. A variant of improvement of the studied plasmatron design with widening of its functional possibilities of multicomponent coating deposition is given. 8 Ref., 7 Fig.
Keywords: plasma-powder spraying, gradient coatings, multilayer coatings, plasma generator with a curvilinear channel, plasma-generating air, volt-ampere characteristics, efficiencyї, specialized plasma device


Received: 31.08.2022

References

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8. (2009) Device for formation of gas-powder flow in plasma spraying. Pat. Ukraine 42589. Int. Cl. В05В 7/00, Н05Н 1/00 No. 200901606; fill. 24.02.2009; publ. 10.07.2009 [in Ukrainian].

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