Interaction of Sintered Aluminum Nitride
with the KFAlF₃ Melt at 700800C

A. Yu. Chuikin^a,*, Yu. P. Zaikov^a,**, and A. R. Beketov^b,***

^aInstitute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences,
ul. Akademicheskaya 20, Yekaterinburg, 620990 Russia

^bUral Federal University, ul. Mira 19, Yekaterinburg, 620002 Russia

*e-mail: chuykin@ihte.uran.ru

**e-mail: zaikov@ihte.uran.ru

***e-mail: beketovar@dpt.ustu.ru

Abstract—Interaction kinetics of the aluminum nitride-based sintered composite material with the potassium
cryolite melt with the cryolite ratio KO = 1.3 at 700–800C is investigated by the continuous weighing method.
It is established that the composite is almost unaffected by the melt at t = 700C. The corrosion rate increases
as the temperature increases. The material interacts with the molten salt through its oxidation stage by oxygen
dissolved in the melt. This is also accompanied by the dissolution of oxygen-containing impurities that are ini-
tially present in the material. No interaction of sintered aluminum nitride with the melt under study was
observed in the absence of the oxidant and with the concentration of alumina dissolved in cryolite close to sat-
uration.

Keywords: aluminum nitride, potassium cryolite, low-temperature aluminum electrolysis, continuous weighing
method

DOI: 10.3103/S1067821214050071

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