"Механики XXI веку" №16 2017

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Механики XXI веку. №16 2017 г.
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Effect of niobium additive on the structure
of self-fluxing plasma coatings
Gnidan K.A.1a, Tyutyunkova M.K.1b, Bezrukova V.A.1c
1Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation
a , ,
Keywords: plasma spraying; alloying, self-fluxing material, Ni-Cr-Si-B
In this article the structure of coatings obtained by air-plasma spraying from the mixture of powders
Ni77Cr15B2Si3 + 2 and 4 wt. % Nb after flowing by a plasma jet was investigated. A comparative analysis
of the microstructure of the coatings before and after alloying is carried out. The Gibbs’ energy values of the
main phases in the coating at T = 1400 K are calculated. The most probable compounds are established. The
results are confirmed by microstructural studies. The microhardness value change is not observed. The av-
erage microhardness of the initial coating without alloying and additionally alloying coatings is the same. It
was noted a positive effect of alloying and flowing on the structure of the coatings. It is shown that the sizes
and volume fraction of the brittle phase is decreased.