JSC ORPE Teсhnologiya named after A. G. Romashin, Obninsk, Russia¹ ; D. I. Mendeleev Russian University of Chemical Technology, Moscow, Russia²

D. V. Kharitonov, Deputy Director for Production Activities of the Scientific and Production Complex, Workshop Manager¹, Doctor of Technical Sciences, Associate Professor of the Department of Chemical Technology of Ceramics and Refractories²

D. I. Mendeleev Russian University of Chemical Technology, Moscow, Russia

D. О. Lemeshev, Associate Professor, Dean of the Faculty of Technology of Inorganic Substances and High-Temperature Materials, Candidate of Technical Sciences, Associate Professor
D. Yu. Zhukov, Director of the Ecochemproject Technological Center, Candidate of Technical Sciences, Associate Professor

JSC ORPE Teсhnologiya named after A. G. Romashin, Obninsk, Russia
N. Е. Sher, Process Engineer of the I grade, e-mail: kolia1211@yandex.ru

The technology of obtaining corundomullite material for the manufacture of melting crucibles, high-temperature tooling of testing machines, lining of glass-making and other furnaces using a method of vibration casting of a mass consisting of a mixture of electrocorundum powders, mullite and chemically cured ethyl silicate binder is considered. The molding mass is prepared by first mixing powders of electrofused white corundum 25A of fractions F36, F100, F600, F1500 and electrofused mullite of PMLP-3 fractions 1,0–3,0 mm. Then, a binder based on ethyl silicate ETS-40 with a hardening catalyst – diethylamine, a hardener – water, and solvent – a mixture of isopropyl alcohol and acetone are added to the powder mixture. Corundomullite material after roasting at 1500 ^oC has sufficiently high density (2.76–2.81 g/cm³), compressive strength (70–90 MPa) and a low coefficient of thermal expansion (65·10–7 K–1 at 1400 ^oC). Refractory melting crucibles have a homogeneous structure: the difference of density of material does not exceed 1.5%. The service life of crucibles in the conditions of melting nickel alloys is at least 25 cycles. The gates of glass furnaces lined with bricks made of the developed material last up to 3 years.

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