Investigation into the Properties of Nonstick Coatings′ Fillers
https://doi.org/10.17073/1997-308X-2015-3-68-73
Abstract
The influence of regimes of mechanical activation on geometric, energetic, and chemical parameters of activation of alumina used as a component of dressing coatings. The studies made it possible to determine the most rational treatment modes, notably, using an AGO-2 planetary-centrifugal mill: activation time is 20 min at material : balls ratio of 1 : 3. The dependences of the average particle size, the total surface, and variation in their phase composition on activation conditions are established. It is shown that the average particle size of alumina particles decreases from 3,2 to 1,6 μm with an increase in their total surface from 31·103 to 61·103 cm2/cm3. X-ray lines also broaden without decreasing their intensity; consequently, now new phases are formed in the course of activation during the decomposition of gibbsite γ-Al2O3. Two fractions are present in mechanically activated alumina, notably, initial α-Al2O3 having the crystallite size of the order of 1 μm (which corresponds to its very narrow lines in X-ray diffraction patterns of initial alumina) and finely dispersed α-Al2O3 with crystallite sizes approximately of 0,1 μm (which usually corresponds to the initial broadening stage of the lines of a new phase), which is formed due to the decomposition of gibbsite.
About the Authors
T. R. Gil’manshina
Институт цветных металлов и материаловедения (ИЦМиМ), Политехнический институт (ПИ)
Russian Federation
Russian Federation
V. N. Baranov
Институт цветных металлов и материаловедения (ИЦМиМ), Политехнический институт (ПИ)
Russian Federation
Russian Federation
S. I. Lytkina
Сибирского федерального университета (СФУ), г. Красноярск
Russian Federation
Russian Federation
S. A. Khudonogov
Сибирского федерального университета (СФУ), г. Красноярск
Russian Federation
Russian Federation
T. N. Stepanova
Институт цветных металлов и материаловедения (ИЦМиМ), Политехнический институт (ПИ)
Russian Federation
Russian Federation
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Review
For citations:
Gil’manshina T.R., Baranov V.N., Lytkina S.I., Khudonogov S.A., Stepanova T.N. Investigation into the Properties of Nonstick Coatings′ Fillers. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2015;(3):68-73. (In Russ.) https://doi.org/10.17073/1997-308X-2015-3-68-73
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