Belgorod State Technological University named after V. G. Shukhov (Belgorod, Russia)

V. V. Strokova, Dr. Eng., Prof., Head of the Dept. of Material Science and Materials Technology, e-mail: s-nsm@mail.ru
A. Yu. Ryazanova, Engineer-Researcher, Dept. of Material Science and Materials Technology, e-mail: YAnastasia.24@yandex.ru

A. V. Abzalilova, Cand. Eng., Associate Prof., Dept. of Material Science and Materials Technology, e-mail: alina.ishchenko.92@mail.ru

Belgorod State Technological University named after V. G. Shukhov (Belgorod, Russia)¹ ; Belenergomash JSC (Belgorod, Russia)²
P. S. Baskakov, Cand. Eng., Associate Prof., Dept. of Material Science and Materials Technology; Leading Laboratory Engineer^{1, 2}, e-mail: rockbas@yandex.ru

Thermal effect, or heat treatment, as a part of each technological process for manufacture of metal constructions and components, is one of the most widely distributed methods for transformation and improvement of physicalchemical properties and structural features of metals and alloys. Several technological processes, such as quenching of metals, require cooling media. In comparison with conventional media (water and oil), which are characterized by essential ecological, technological and fire-proof technical restrictions, use of polymeric emulsions as quenching media is actual. This sort of quenching media has several advantages: it allows to control metal cooling rate and provides uniform cooling of product surface, what allows to prevent appearance of internal stresses, cracks, deformations and defects in material structure. To develop colloid-stable emulsion, using as cooling media in metal quenching, it is actual to apply polysiloxane resin as polymeric component, due to hydrophobic ability of emulsified polysiloxane. In this case, obtain of water emulsions of polysiloxane resins needs especial conditions of emulsification. The paper suggests use of polysiloxane water emulsion, which was obtained via the method of phase inversion at the optimal temperature conditions as cooling liquid in metal quenching; these optimal emulsification parameters include speed 9,500–10,000 min^-1, temperature 60 ºС and time period 60 min. Obtained emulsion on the base of polysiloxane and polyvinyl alcohol is characterized by small size of particles (about 1–2 μm), low viscosity (0.2 Pa·s), owing to high shifting forces during emulsification and temperature procedure, while metal surface acquires hydrophobic effect after emulsification, with the value of wetting angle up to 146°. It is shown that consequent lowering of polysiloxane concentration in water emulsion provides low viscosity even during temperature rise. When polysiloxane concentration reaches 7.5 %, emulsion displays good heat-exchanging capacity, which provides quenching rates comparative with use of industrial oil and water-polymeric media. The structure with acicular troostite and cementite, which is typical for substantially lower cooling rate, are mainly forming as a result of polysiloxane water emulsion use during quenching of samples made of steel 35Kh.

The research was carried out within the framework of realization of the State assignment of RF Ministry of education and science No. FZWN-2023-0006 with use of equipment in the Center of high technologies at Belgorod State Technological University named after V. G. Shukhov.

1. Baokun W., Renjie J., Zheng G., Qingyang Z., Yonghong L., Hui J., Lixin W., Zhiqian X., Baoping C., Jianmin M. Effect of water in oil emulsion on the surface quality of Inconel 718 alloy during coupling electrical pulse and ultrasonic treatment. Surface and Coatings Technology. 2022. 128355.
2. Astashchenko V. I. Features of cooling ability of polymeric water solutions. Sotsialno-ekonomicheskie i tekhnicheskie sistemy: issledovanie, proektirovanie, optomizatsiya. 2007. No. 1. p. 2.
3. Pranesh Rao K. M. Narayan Prabhu K. Compositional and bath temperature effects on heat transfer during quenching in molten NaNO₃–KNO₃ salt mixtures. Journal of Materials Engineering and Performance. 2020. Vol. 29. pp. 1860–1868. DOI: 10.1007/s11665-020-04692-2
4. Liscic B. Heat transfer control during quenching. Materials and Manufacturing Processes. 2009. Vol. 24. pp. 879–886.
5. Oshurina L. A. Research of steel 10 structure after quenching in polymeric media. Colloquium-Journal. 2020. No. 6–1 (58). pp. 50–52.
6. Ishchenko A. V., Baskakov P. S, Strokova V. V., Molchanov A. O. Stabilization and coalescence of hydrophobic emulsion on the base of polysiloxane liquid. Uchenye zapiski Krymskogo federalnogo universiteta imeni V. I. Vernadskogo. Biologiya, khimiya. 2018. Vol. 4 (70). No. 1. pp. 203–213.
7. Strokova V. V., Nikulina M. V., Ishmukhametov E. M., Esina A. Yu., Baskakov P. S., Stepanenko M. A., Markova I. Yu., Abzalilova A. V., Ryltsova I. G. Modification of Organosilicon Emulsions for Obtaining Hydrophobic Surfaces and for Reducing Dust Deposition. Chemistry for Sustainable Development. 2023. Vol. 31. No. 3. pр. 337–342.
8. Mandzyuk M. G., Kulichenko S. A. Micellar extraction of ions in easily hydrolyzed metals with 2,3,7-trioxyfluorons in modified phase of chloride cetylpyridinium. Analitika i kontrol. 2014. Vol. 18. No. 1. pp. 99–104.
9. Akulovich L. M., Sergeev L. E., Lebedev V. Ya., Senchurov E. V. Lubricating and cooling technological remedy on the base of oxyethylated alkylphenols for magnetic abrasive processing of aluminium alloys. Izvestiya Natsionalnoy akademii nauk Belarusi. Seriya fiziko-tekhnicheskikh nauk. 2010. No. 1. pp. 42–45.
10. Kozhukhova M. I., Strokova V. V., Sobolev K. S. Hydrophobization features of fine-grained concrete surfaces. Vestnik Belgorodskogo gosudarstvennogo tekhnologicheskogo universiteta im. V. G. Shukhova. 2014. No. 4. pp. 33–35.
11. Tsymbalov A. S. Influence of surface active substances on dispersion and stability of water oil emulsions. Sovremennye naukoemkie tekhnologii. Regionalnoe prilozhenie. 2018. No. 3 (55). pp. 108–119.
12. Pozdnyakova T. A., Puchnkova O. M. Study of influence of various emulsifiers on quality of emulsions of extemporaneous manufacture. Vestnik Voronezhskogo gosudarstvennogo universiteta. Seriya: Khimiya. Biologiya. Farmatsiya. 2019. No. 1. pp. 102–108.
13. Portnova D. A., Verolainen V. A., Temnikova S. A. Obtaining of olive oil emulsions in water solutions stabilized by OC-20 and Span-60. Vestnik Tverskogo gosudarstvennogo universiteta. Seriya: Khimiya. 2020. No. 1 (40). pp. 137–142. DOI: 10.26456/vtchem2020.2.17
14. Koroleva M. Yu., Nagovitsyna T. Yu., Bydanov D. A., Yurtov E. V. Direct nano-emulsions, stabilized by the mixtures of non-ionogenic SAS. Butlerovskie soobshcheniya. 2014. Vol. 38. No. 4. pp. 119–125.
15. Mishchenko E. V., Danilova Yu. A., Buyanova D. A., Korole va M. Yu. Study of the effect of ionogenic SAS on size and Z-potential of paraffin nano-particles. Uspekhi v khimii i khimicheskoy tekhnologii. 2022. Vol. 36. No. 9 (258). pp. 138–140.
16. Deryabin K. V., Islamova R. M. Ferrocenyl-containing oligopolysiloxanes: synthesis, properties, application. Vysokomolekulyarnye soedineniya. Seriya С. 2022. Vol. 64. No. 1. pp. 106–120. DOI: 10.31857/S2308114722700091
17. Lyubova T. S., Grishin I. D., Zakharycheva N. S., Zakharychev Е. А., Lermontova S. A., Klapshina L. G., Ladilina L. Yu. Water-soluble polysiloxane as a remedy for specimens delivery for bio-imaging. Izvestiya Akademii nauk. Seriya khimicheskaya. 2021. No. 1. pp. 99–106.
18. Erofeev D. A., Kalinin A. V., Voznyakocskiy A. P., Shugaley I. V. Water emulsions of polysiloxane polyblocking co-polymers as a base of ecological hydrophobic protective coatings. Ekologicheskaya khimiya. 2017. Vol. 26. No. 5. pp. 271–277.
19. Baskakov P. S, Strokova V. V., Ishchenko A. V. The method for obtaining of hydrophobic water emulsion for coating of building materials. RF Patent. RU 2703252 C1. Introduced: 15.10.2019. Application No. 1019107994. 20.03.2019.
20. Totten G. E. Steel Heat Treatment: Metallurgy and Technologies. 2nd edition, CRC Press. 2006. 820 p.