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Continuous Casting and Foundry Processes
ArticleName Study of the depth of penetration of self-heating non-stick coatings in cold-hardening mixtures
ArticleAuthor I. E. Illarionov, T. R. Gilmanshina, A. A. Kovaleva, V. A. Borisyuk
ArticleAuthorData

Chuvash State University (Cheboksary, Russia)

I. E. Illarionov, Dr. Eng., Prof, Head of the Chair “Metal science and metallurgical processes”, e-mail: tmilp@rambler.ru

 

Siberian Federal University (Krasnoyarsk, Germany)
T. R. Gilmanshina, Cand. Eng., Associate Prof., e-mail: gtr1977@mail.ru
A. A. Kovaleva, Cand. Eng., Associate Prof.
V. A. Borisyuk, Post-Graduate

Abstract

The purpose of this work is to investigate the thickness of the cover and penetrating layers, depending on the content of mechanically activated graphite in the coating filler, applied to cold-hardening mixtures based on liquid glass and resins. In the course of the work it was found that with the increase in the content of activated graphite (from 0 to 100%) in the filler composition for all investigated mixtures, the thickness of the coating layer decreases (for liquid-glass mixtures on quartz sands 3K3O2016 and 2K1O303 — from 0,59 to 0,26 and from 0,56 to 0,12, for cold-hardening mixtures on ecolite and alphabond resins — from 0,56 to 0,1 mm and from 0,46 to 0.06 mm, respectively), and the penetrating increases (for liquid-glass mixtures on quartz sand 3K3O2016 and 2K1O303 — from 0,28 to 2,04 and from 0,28 to 2,41, for cold-hardening resins on ecolite and alphabond — with 0,28 to 1,74 mm and from 0,63 to 0,93 mm, respectively). The most optimal ratio of natural and activated graphite to the fi ller of self-drying non-stick coatings based on cryptocrystalline graphite can be considered 50 : 50. In this case, large particles of natural graphite will remain on the surface of the mold, forming a cover layer, and fi ne particles of activated graphite will penetrate in the pores of the mold, creating a penetrating layer. The roughness of the casting will be determined by the particle size of the graphite in the cover layer of the coating. The results of the research are recommended to be used in foundries for the production of castings.

keywords Graphite, self-drying coating for cast iron, cover layer, penetrating layer, liquid-glass mixtures, cold-hardening mixtures
References

1. Illarionov I. E. III International Scientific and Practical Conference ”Modern Technologies in Machine Building and Foundry”. Chernye Metally. 2018. No. 1. pp. 78–79.
2. Boldin A. N., Davydov N. I., Zhukovsky S. S. et al. Foundry materials. Foundry, core sand mixtures and coatings: reference book. Moscow: Mashinostroenie, 2006. 507 p.
3. Prstić A., Aimović-Pavlović Z., Andrić L. et al. Zircon-based coating for the applications in lost foam casting process. Chemical Industry & Chemical Engineering Quarterly. 2012. Vol. 18, Iss. 4. pp. 587−593.
4. Nwaogu U. C., Tiedje N. S. Foundry Coating Technology: A Review. Materials Sciences and Application. 2011. Vol. 2. pp. 1143–1160.
5. Illarionov I. E. Application of fabrication technology for metal phosphate binders, core sands and moulding binders on their base. Chernye Metally. 2018. No. 4. pp. 13–19.
6. Valisovsky I. V. Burning-in on castings. Moscow: Mashinostroenie, 1983. 192 p.
7. Illarionov I. E., Shalunov E. P., Strelnikov I. A. et. al. Forming quality of moulds and castings surface. Design and promising technologies in machine building and metallurgy: proceedings of the II Republican scientific and practical conference. Cheboksary: FGBOU VPO «Chuvashsky gosudarstvenny universitet im. I. N. Ulyanova», 2016. pp. 44–51.
8. LaFay V., Neltner S. Sand casting pattern coating compositions containing graphite. Pat. 7507284 US. Claimer and patent owner: The Hill And Griffith Company. Applied: 17.09.2004. Published: 23.03.2006.
9. Lytkina S. I. Development and study of antipenetration washes for iron castings based on chemical and mechanochemical activated graphites: Dissertation … of Candidate of Engineering Sciences. Krasnoyarsk, 2013. 132 p.
10. Gerasimova A. A., Radyuk A. G. The improvement of the surface quality of workpieces by coating. CIS Iron and Steel Review. 2014. Vol. 9. pp. 33–35.
11. Gebler K. A., Ferrara J. M., Grothaus J. V. Casting process with lignosulfonate-humate-graphite mold coatings. Pat. 4034794 US. Claimer and patent owner: Nalco Chemical Company. Applied: 28.01.1977. Published: 12.07.1977.
12. Haanepen M. J., von Piekartz F. W., Piekartz-Lutgendorff Y. Foundry coating composition. Patent 20130032689 A1 US. Patent owner: Foseco International Limited. Applied: 15.02.2011. Published: 07.02.2013.
13. Bazhin V. Yu. Structural modifi cation of petroleum needle coke by adding lithium on calcining. Coke and Chemistry. 2015. Vol. 58, Iss. 4. pp. 138–142.
14. Leushin I. О., Grachev А. N., Grigorev I. S. et al. Multifunctional coatings for temporary molds of steel and iron castings. Tekhnologiya metallov. 2005. No. 8. pp. 25–27.
15. 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.
16. Mamina L., Gilmanshina T., Koroleva G. Promising methods for graphite enrichment. Liteynoe proizvodstvo. 2003. No. 2. pp. 16–18.
17. Lytkina S. I., Khudonogov S. A., Kritsky D. Yu. Study of parameters of cryptocrystalline graphite treated by different methods. Obogashchenie rud. 2017. No. 1. pp. 15–18.
18. Gilmanshina T. R., Amelchenko V. N., Kovaleva А. А., Borisyuk V. А., Fomin P. А., Kritsky D. Yu., Chefanova Ya. S. Development of compositions for self-drying coatings of iron castings. Proceedings of the III All-Russia scientific and practical conference «Design and promising technologies in machine-building, metallurgy and their staffing». Cheboksary: Izdatelstvo Chuvashskogo gosudarstvennogo universiteta, 2017. pp. 108–112.

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