NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2019, 10 (6), P. 725–732
Experimental evaluation of chemical resistance of steatite products towards aluminum-based melts
N. K. Orlov – Faculty of materials science, Lomonosov Moscow State University, Moscow, Russia; nicolasorlov174@gmail.com
D. A. Kozlov – Faculty of materials science, Lomonosov Moscow State University, Moscow, Russia; kozlov@inorg.chem.msu.ru
S. A. Tikhonova – Faculty of materials science, Lomonosov Moscow State University, Moscow, Russia
A. A. Tikhonov – Faculty of materials science, Lomonosov Moscow State University, Moscow, Russia
A.V. Garshev – Faculty of materials science, Lomonosov Moscow State University, Moscow; Faculty of Chemistry, Lomonosov Moscow State University, Moscow, Russia; garshev@inorg.chem.msu.ru
P.V. Evdokimov – Faculty of materials science, Lomonosov Moscow State University, Moscow; Faculty of Chemistry, Lomonosov Moscow State University, Moscow, Russia
V. I. Putlayev – Faculty of materials science, Lomonosov Moscow State University, Moscow; Faculty of Chemistry, Lomonosov Moscow State University, Moscow, Russia
A. A. Vasyakov – Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia; vasyakov@nanolab.phys.msu.ru
A.V. Chetvertukhin – Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia; chetvertukhin@nanolab.phys.msu.ru
A. K. Petrov – Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
I.Yu. Mikhailov – LLC Light Materials and Technologies Institute, Moscow, Russia; Ivan.Mikhaylov@rusal.com
S.V. Polyakov – JSC Russian Aluminium Management, Moscow, Russia
A. A. Fedyanin – Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia; fedyanin@nanolab.phys.msu.ru
The processes taking place with a spray unit during aluminum dispersion have been analyzed. It has been shown that the major process which occurs in a nipple during aluminum flowing is the reduction of silicon with aluminum and, also, with magnesium from the melt (in case when aluminum-magnesium or magnesium-containing alloys are used). The reduction of silicon results in the formation of nanoscale particles with crystalline size 20–50 nm and leads to the degradation of the nipple material, which is accompanied by its cracking and the formation of nanoscale channels and the flow of melt into the material through these channels. This phenomenon leads to the rupture and/or blockage of the nipple.
Keywords: aluminum alloys, steatite, steatite nipple, AK7 alloy.
PACS 65.40.-b, 81.20.-n, 81.40.Gh, 61.25.Mv
DOI 10.17586/2220-8054-2019-10-6-725-732
