Chemical processes in the Mo-W-Al2O3 system during sapphire crystal growth from melt

Autor:	D. V. Kostomarov, Kh. S. Bagdasarov, E. V. Antonov
Rok vydání:	2012
Předmět:	Inert Chemical process Controlled atmosphere Materials science Evaporation Analytical chemistry Mineralogy Crystal growth General Chemistry Condensed Matter Physics Chemical reaction Sapphire Degradation (geology) General Materials Science
Zdroj:	Crystallography Reports. 57:590-594
ISSN:	1562-689X 1063-7745
DOI:	10.1134/s1063774512010051
Popis:	The main chemical reactions occurring in the Mo-W-Al2O3 system at T = 2400 K and P = 1 bar in an inert controlled atmosphere are considered. The mechanisms of Mo and W oxidation by the dissociative evaporation of melt products are determined. It is established that, at a formally low fraction of evaporating Al2O3, multiply repeated evaporation-condensation and oxidation-reduction cycles are unfavorable for the operation of W heater and Mo-containing elements of heating-unit elements. It is found that gaseous Mo oxides (MoO and MoO3) can also affect the degradation of the W heater. A detailed study of the chemical processes should facilitate the optimization of the conditions of sapphire crystal growth from melt.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1baeefae109a637afda9332fccc5c18f https://doi.org/10.1134/s1063774512010051 Zobrazit plný text záznamu Plný text ve formátu PDF