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Foundry Production
ArticleName Liquid self-hardening mixture of improved technology for manufacture of molds and cores of steel castings
DOI 10.17580/chm.2022.04.03
ArticleAuthor I. O. Leushin, A. N. Grachev, L. I. Leushina, P. M. Yavtushenko

Nizhny Novgorod State Technical University named after R. E. Alekseev, Nizhny Novgorod, Russia:

I. O. Leushin, Dr. Eng., Professor, Head of the Dept. of Metallurgical Technologies and Equipment, e-mail:
A. N. Grachev, Cand. Eng., Associate Professor, Dept. of Metallurgical Technologies and Equipment, e-mail:
L. I. Leushina, Cand. Eng., Associate Professor, Dept. of Metallurgical Technologies and Equipment, e-mail:
P. M. Yavtushenko, Postgraduate Student, Dept. of Metallurgical Technologies and Equipment


Liquid, or liquid, self-hardening mixtures successfully combine the properties of a liquid, which make it possible to manufacture casting molds and cores by free pouring the mixture in a gravitational field without applying external influences to it, and the ability to independently solidify in air for a certain time and ensure residual gas permeability of the casting mold, or rod up to 400 units. However, until now, such mixtures have not been widely used in practice due to their insufficient manufacturability. In this work, the task was to find the composition and test a self-hardening liquid mixture with improved manufacturability for the production of molds and cores of steel casting. The expected technical result of its solution was the provision of high compressive strength and survivability with minimal crumbling of the mixture without reducing its fluidity and gas permeability. The composition of the mixture is proposed, including a refractory filler, a binder, a hardener, a foaming agent, a foam stabilizer and water, in which quartz sand acts as a refractory filler, a binder is water glass, a hardener is ethylene glycol acetate, a foaming agent is a synthetic detergent from the group of alkyl sulfates, and in as a foam stabilizer - a ready-made organosilicon binder. The roles of each of the components and their influence on the complex of technological properties of the mixture are described. The results of experimental work carried out to assess the effectiveness of the proposed solution are presented. The results of the experiments showed that the self-hardening liquid mixture proposed by them can be successfully used for the manufacture of casting molds and cores of steel casting for critical purposes.

keywords Steel casting, liquid self-hardening mixture, casting mold, casting core, processability, hardener, foaming agent, foam stabilizer

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