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ArticleName Development of coatings composition and equipment for repair and strengthening of power generating unit elements by plasma spraying
DOI 10.17580/tsm.2016.05.09
ArticleAuthor Bogdanovich V. I., Marin S. B., Dokukina I. A., Giorbelidze M. G.

Samara State Aerospace University, Samara, Russia:
V. I. Bogdanovich, Professor of a Chair of Aircraft and Quality Management in Mechanical Engineering
I. A. Dokukina, Assistant Professor of a Chair of Aircraft and Quality Management in Mechanical Engineering
M. G. Giorbelidze, Post-Graduate Student of a Chair of Aircraft and Quality Management in Mechanical Engineering

Komsomolsk-on-Amur State Technical University, Komsomolsk-on-Amur, Russia:

S. B. Marin, Professor of a Chair of Mechanical Engineering and Metallurgy, e-mail:


The main cause of heat station power generating units' service life exhaustion is the most erosion wear and contact wear of the turbine blade leading edges, the shaft bearing surfaces and other surfaces depended upon high velocity flow, high rotational velocity and loads. The sharp increase of steam turbine elements wear intensity, observed in the last two decades during unit scheduled repair, is closely relating with the change of heat station operation conditions. The main cause of power generation unit elements wear, such as steam turbine blades, shaft bearing surfaces and other surfaces is described in the article. An efficient method of power plant elements repair is significantly increasing service life and extending lifespan of power plants. Spraying process is carried out by small-sized mobile unit, developed by the authors. The coating compositions and deposition technology are identified. Some properties of deposition layers, such as structure, porosity, chemical and phase composition, microhardness, adhesion strength, heat resistance and wear resistance are investigated for the estimate of coating operating capacity. The recovery process of steam turbine blades, shafts and strengthening of their surfaces can be realized without a complete dismounting of the unit. One of the important results of this research is determination of the fact that the formation of coatings with the intercrystalline boundary structure located along the outer surface of the element, is the significantly raising coating-base system performance.
The research was carried out in collaboration with the specialists of Samara State Aerospace University, with the financial support of the Ministry of Education and Science of Russian Federation.

keywords Heat station, power generating unit, plasma spraying, smallsized mobile unit, stellite plate, coating compositions, turbine blade, erosive wear

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