Chemical transformations in the W-Al2O3 system under pressure P = 1 bar near the melting point of aluminum oxide |
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| Authors: | D V Kostomarov Kh S Bagdasarov S A Kobzareva and E V Antonov |
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| Institution: | (1) Dipartimento di Produzioni Animali, Biotecnologie Veterinarie, Qualit? e Sicurezza degli Alimenti, Universit? degli Studi di Parma, via del Taglio, 10, 43100 Parma, Italy |
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| Abstract: | The W-Al2O3 system has been considered at a temperature of 2400 K and a pressure of 1 bar. The main chemical processes providing the
interaction between the components of the system have been determined. It is shown that evaporation of Al2O3 into the gas phase gives rise to numerous reactions, which involve not only tungsten but also Al2O3 melt. It is concluded that such interactions can be reduced by decreasing the Al2O3 evaporation, which can be done by increasing the inert gas pressure. This approach makes it possible both to optimize the
parameters of sapphire crystal growth and increase the lifetime of a tungsten heater and other units of crystallization systems. |
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