Journals →  CIS Iron and Steel Review →  2021 →  #1 →  Back

Casting and Foundry
ArticleName Analysis of physical-chemical processes occurring on the boundary between the melt and non-stick coating
DOI 10.17580/cisisr.2021.01.06
ArticleAuthor T. R. Gilmanshina, I. V. Dubova, N. V. Vasyunina, A. A. Kovaleva
ArticleAuthorData

Siberian Federal University (Krasnoyarsk, Russia):

T. R. Gilmanshina, Cand. Eng., Associate Prof., e-mail: gtr1977@mail.ru
I. V. Dubova, Cand. Eng., Associate Prof.
N. V. Vasyunina, Cand. Eng., Associate Prof.
A. A. Kovaleva, Cand. Eng., Associate Prof.

 

Dr. Eng., Prof. I. E. Illarionov participated in this research.

Abstract

This research presents the results of thermodynamic analysis of interaction between iron-carbon melts and graphite-containing non-stick coating during manufacture of iron castings in the temperature interval from 500 to 1400 °С. SCh20 cast iron and aqueous-base non-stick coating with use of natural hidden crystalline graphite were taken as the objects in this research. The processes on the boundary between the melt and non-stick coating, its reduction by the melt components (carbon, silicon) and interaction with dissolved oxygen were considered during evaluation of interaction between the system phase components. The conducted thermodynamic calculations displayed that reactions of interaction between coating carbon and oxygen are passing mainly to carbon (II) which forms reducing atmosphere in the mould cavity and provides decrease of burning-on. Forming of mixed Fe3O4 during reaction of coating carbon with Fe (III) oxide is confirmed. The forming CO interacts only with Fe2O3. It should be noted that presence of pyrite in coating composition through the chain of reducing and oxidizing processes lead to forming of oxysulfates and oxysulfides, which support forming of burning-on on the surface of castings. It is concluded that thermodynamic analysis of chemical reactions of interaction between coating phases and melt components as well as mould atmosphere can help to predict operating efficiency of carbon-containing coating during its development.

keywords Shear stress, shift, thin-walled tube, tube torsion, Huber-Mises’s condition, Tresca-Saint-Venant’s condition, Nadai’s and Ludwik’s descriptions
References

1. Shvetsov V. I., Ivanov M. A., Kulakov B. A., Karkarin A. M. Processes of forming and prevention of burning-on on steel casings. Vestnik Yuzhno-Uralskogo gosudarstvennogo universiteta. Seriya: Metallurgiya. 2015. Vol. 15. No. 1. pp. 17–23.
2. Chen-Cheng Sun, Lee Shih-Chin, Dai Shyue-Bin et al. Surface free energy of non-stick coatings deposited using closed field unbalanced magnetron sputter ion plating. Applied surface science. 2007. Vol. 253. Iss. 8. рр. 4094–4098.
3. Rodriguez-Alabanda O., Molleja Molleja R., Guerrero-Vaca G., Romero P. E. Direct manufacturing of non-stick molds via single point incremental forming. Procedia Manufacturing. 2019. Vol. 41. pp. 1135–1140.
4. Kukuy D. M., Andriyanov N. V. Theory and technology of casting production. Moulding materials and mixtures. Minsk : BNTU. 2005. 390 p.
5. Illarionov I. E., Vasin Yu. P. Moulding materials and mixtures. Cheboksary : Izdatelstvo Chuvashskogo gosudarstvennogo universiteta. 1995. Part 2. 288 p.
6. Illarionov I. E., Gamov E. S., Vasin Yu. P., Chernyshevich E. G. Metal phosphate binding agents and mixtures. Cheboksary : Izdatelstvo Chuvashskogo gosudarstvennogo universiteta. 1995. Part 2. 524 p.
7. Zhukovskiy S. S., Anisovich N. N. et al. Moulding materials and technology of casting mould. Edited by Zhukovskiy S. S. M. : Mashinostroenie. 1993. 432 p.
8. Nikolaichik Yu. A., Rudnitskiy F. I., Bataichuk A. V., Mudryi V. V. Analysis of the methods for burning-on prevention on the surface of iron and steel castings. Lityo i metallurgiya. 2015. No. 1 (78). pp. 23–28.
9. Kukuy D. M., Nikolaichik Yu. A., Sudnik L. V. Thermodynamic analysis of chemical reactions in the contact area “metal – non-stick coating”. Lityo i metallurgiya. 2010. No. 3 (57). pp. 51–56.
10. Nikitchenko M. N., Semukov A. S., Saulin D. V., Yaburov A. Yu. Study of thermodynamic possibility of interaction between materials of casting mould and metal during casting of titanium alloys. Vestnik PNIPU. 2017. No. 4. pp. 249–263.
11. Ovcharenko, P. G., Kuzminykh E. V., Ladyanov V. I. Interaction of a Nonstick Corundum Coating with Iron–Carbon Melts under Lost-Foam Casting. Russian Metallurgy (Metally). 2020. No. 2. рр. 115–120.
12. Kalistov S. V., Leushin I. O., Gerotskiy V. A. Thermodynamic analysis of the process of steel melt carbonization in manufacture of synthetic iron. Sotsialno-ekonomicheskie i tekhnicheskie sistemy: isslrdovanie, proektirovanie, optimizatsiya. 2008. No. 9. p. 3.
13. Babkin V. G., Leonov V. V., Gilmanshina T. R., Stepanova T. N. Phase transformations in graphite coatings and their effect on surface cleanness of castings. Chernye metally. 2017. No. 10. pp. 54–59.
14. Gilmanshina T. R., Lytkina S. I., Khudonogov S. A. et al. Development of the state-of-the-art technologies for improvement of quality of cryptocrystalline graphite. Nanosistemi, Nanomateriali, Nanotehnologii. 2018. Vol. 16 (1). pp. 83–101.
15. Amelchenko V. N., Illarionov I. E., Gilmanshina T. R., Borisyuk V. A. Graphite as a prospective material for metallurgical application. CIS Iron and Steel Review. 2018. Vol. 16. pp. 29–32.
16. Bannykh O. A., Budberg P. B., Alisova S. P. et al. Phase equilibrium diagrams of iron-based dual and multi-component systems. M. : Metallurgiya. 1986. 440 p.

Full content Analysis of physical-chemical processes occurring on the boundary between the melt and non-stick coating
Back