Research on Reaction Mechanism of SiC and AlF3 in CO Atmosphere
The reaction between SiC and AlF3 has been investigated in CO atmosphere at high temperature. Experimental results are shown that the reaction intensity between SiC and AlF3 is accelerated with the rise of temperature. At the temperature of 950 (aluminum electrolytic operation temperature is 935±15), the reaction intensity of SiC and AlF3 is not high and the major reaction products are SiF4 gas and Al4C3; Al4C3 occur severe hydration at room temperature which leads to the pulverization of specimens. The unexpected cells stop should try to be avoided or reduced during the usage of Si3N4-bonded SiC sidewall brick in aluminum electrolysis cells because of Al4C3 existents possibly.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
J. P. Wang et al., "Research on Reaction Mechanism of SiC and AlF3 in CO Atmosphere", Advanced Materials Research, Vols. 233-235, pp. 2610-2614, 2011