Institute of Metallurgy of Ural Branch of Russian Academy of Sciences, Ekaterinburg, Russia:

M. N. Zakharov, Junior Researcher, e-mail: mr.mizani@mail.ru
O. F. Rybalko, Researcher
O. V. Romanova, First Category Engineer
B. R. Gelchinskiy, Doctor of Physical and Mathematical Sciences, Head of Laboratory

The powder, made from wastes of mechanical treatment of VT-22 (ВТ-22) alloy ingots was manufactured by using powder metallurgy methods. Our paper considers the possibility of this powder being used in treatment, production, as well as cladding by plasma coating method. When compacting the samples, we investigated the influence of various additives with high plasticity, which contribute to stiffening of VT-22 powder particles. We also studied the influence of compacting force and sintering modes. Based on the obtained data, it was established that the optimal content of VT-22 powder for obtaining of high-quality pressings should not be higher than 75%. VT-22 powder may be used, through powder metallurgical methods, to obtain both composite and homogeneous solid products with addition of the same powder obtained by HDH method. We also found the most prospective type of composition to obtaining composite materials with good strength properties. Protective coatings on steel padding were obtained by plasma spraying. We made the adhesion test of one part of the coating samples: the test was made with padding by three-point bending. The corrosion resistance test of the other part was made in a salt fog chamber. When carrying out the latest test on combined coatings, we found the corrosion pit, which showed low protective properties. The three-point bending test showed a good adhesion of coatings with padding. Therefore, the obtained coatings have rather high durability properties, but rather low anticorrosion properties. After plasma coating, we collected the powder, sent through the plasma, to investigate the influence of orifice gas on VT-22’s powder properties. After sending the powder through the plasma, there was almost no change to its physical and technological properties, chemical composition and particle morphology. We confirm the possibility of a repeated usage of the powder.
This work was carried out with the financial support of the Ural Branch of RAS (grant No. 15-17-3-41).

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