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Saint Petersburg, Russia

Tochil'nikov D.G.,Russian Academy of Sciences | Kupchin A.N.,Russian Academy of Sciences | Shepelevskii A.A.,Russian Academy of Sciences | Shiyan P.A.,Russian Academy of Sciences | And 2 more authors.
Journal of Friction and Wear | Year: 2011

The effect of wear debris on the antifriction and antiwear properties of industrial oils I-20A and I-40A in boundary sliding of steel against steel is studied. Variations in the tribological characteristics, including the friction coefficient, linear and energy wear rates, carrying capacity, and others, are studied during running-in and friction of run-in contacts. Among the specified concentrations of wear debris, the concentration of 0.8-1.0 mg/ml is found to be inadmissible and requires oil replacement. The temperature dependences of the friction coefficient for run-in contacts are obtained. It is shown that in all cases the properties of oil I-40A surpass those of oil I-20A. © 2011 Allerton Press, Inc. Source

Voznyakovskii A.P.,Faktoriya LS Ltd. | Ponimatkin V.P.,Faktoriya LS Ltd. | Timkin V.V.,Faktoriya LS Ltd.
Russian Journal of General Chemistry | Year: 2013

Finely dispersed titanium dioxide is widely used in modern technologies. Proved reserves of titanium ores in Russia are expected to meet industrial needs. However, the available facilities for the manufacture of titanium dioxide from ores are clearly insufficient, which naturally requires new plants to be put into operation. The technologies used for the production of titanium dioxide were developed as early as 1940s, when ecological aspects of the production process were almost not taken into account. The present survey analyzes environmental problems related to the titanium dioxide production according to the sulfate and chloride technologies in comparison with the fluoride process proposed for industrial implementation. The fluoride process has been examined as applied to ilmenite from the Turan deposit in Tomsk oblast, and some actions directed toward improvement of ecological parameters of this process have been proposed. © 2013 Pleiades Publishing, Ltd. Source

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