Casting | |
Название | Choice of the optimal composition of non-stick coatings according to the conditional criterion of filling mass activation |
DOI | 10.17580/cisisr.2020.01.05 |
Автор | T. R. Gilmanshina, S. A. Khudonogov, S. I. Lytkina, N. S. Perfilyeva |
Информация об авторе | Siberian Federal University (Krasnoyarsk, Russia): T. R. Gilmanshina, Cand. Eng., Associate Prof., E-mail: gtr1977@mail.ru
Dr. Eng., Prof. I. E. Illarionov participated in this work. |
Реферат | Development of the technique for choice of the optimal composition of non-stick coatings based on the filling mass quality evaluation (taking into account the results of differential scanning calorimetry) is the aim of this research. Non-stick coating for iron casting based on filling mass and polyvinyl butyral lacquer was taken for investigations with the following relation – filling mass : polymer composition (2% polyvinyl butyral lacquer) = 1:1. The mixture of natural and mechanically activated graphite with their different correlation was used as a filling mass. Calculation of the conditional activation criterion displayed that the most optimal relation between selfdrying coatings of natural and mechanically activated graphite in a filling mass is 50:50. It was established in this case that increase of activated graphite in a filling mass of non-stick coatings leads to increase of density, toughness and reduced strength. The most essential improvement of the properties is observed if the content of activated graphite in a filling mass increased up to 50%. Additional increase of GLS-2A graphite content does not lead to substantial improvement of the properties. The developed non-stick coatings were tested during fabrication of the casting “Centrifugal soil pump. Internal pump shell” with mass 70 kg and size 510×615×128 mm, made of 320Kh20N (320Х20Н) iron. Use of non-stick coating on the base of the mixture of natural and mechanically activated graphite (with their relation 50:50) is characterized by decrease of burning-on thickness by 1.8 times (on the bottom surface of a casting) and by 1.9 times (on the side surface of a casting) in comparison with thickness values for non-painted castings. The obtained results can be explained in the following way: if we apply the coating containing 50% GLS-2 (ГЛС-2) and 50% GLS-2A (ГЛС-2А), large particles of natural graphite don’t penetrate in mould pores and remain on the surface, what leads to decrease of burning-on on the casting surface. |
Ключевые слова | Graphite, conditional activation criterion, mechanical activation, thermal analysis, non-stick coatings, density, toughness, reduced strength, iron, burningon |
Библиографический список | 1. Ovcharenko P. G., Kuzminykh E. V., Lad’yanov V. I. Interaction of a Nonstick Corundum Coating with Iron–Carbon Melts under Lost-Foam Casting Conditions. Russian Metallurgy (Metally). 2020. No. 2. pp. 115–120. |
Полный текст статьи | Choice of the optimal composition of non-stick coatings according to the conditional criterion of filling mass activation |