Chlorination of Hafnium Dioxide by Gaseous Chlorine in the Presence of Carbon / Bataev Ya. S.,Zaikov Yu. A.,Lokhmotko Yu. A.,Polovov I. B.,Rebrin O. I.,Chuikin A. Yu.,Yamshchikov L. F. // RUSSIAN JOURNAL OF NON-FERROUS METALS. - 2010. - V. 51, l. 4. - P. 296-302.

ISSN/EISSN:

1067-8212 / нет данных

Type:

Article

Abstract:

The thermodynamic simulation of chlorination of hafnium oxide by gaseous chlorine in the presence of carbon at T = 450-1000 degrees C is performed. It is shown that the main reaction products are gaseous hafnium tetrachloride, carbon monoxide, and carbon dioxide; as the temperature increases, the partial pressure of CO increases, while that of CO(2) decreases. In the mentioned temperature range, the variations in the enthalpy, entropy, and the Gibbs energy of chlorination reactions are calculated and the composition of the gas phase under the conditions of thermodynamic equilibrium is determined. In the course of studying the kinetics of chlorination of HfO(2) in the presence of carbon in the range T = 600-950 degrees C, it is established that its limiting stage depends on the process temperature. Below 700 degrees C, its rate is limited by the chemical reaction on the surface of nonporous solid spherical particles of the body with the formation of the volatile product; above 700 degrees C, it is limited by the mass transfer of gaseous substances.

Author keywords:

hafnium oxide; chlorination; kinetics; thermodynamics; hafnium tetrachloride KINETICS; CARBOCHLORINATION

DOI:

10.3103/S1067821210040073

Web of Science ID:

ISI:000282068400007

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUL-AUG
Publisher	ALLERTON PRESS INC
Address	18 WEST 27TH ST, NEW YORK, NY 10001 USA
Language	English
Keywords-Plus	KINETICS; CARBOCHLORINATION
Research-Areas	Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Metallurgy \& Metallurgical Engineering
Author-Email	bataev@inbox.ru Dir@ihte.uran.ru t899hk@olimpus.ru polovov@dpt.ustu.ru oirebrin@gmail.com chuykin@ihte.uran.ru jaaf@dpt.ustu.ru
Number-of-Cited-References	20
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	17
Journal-ISO	Russ. J. Non-Ferrous Metals
Doc-Delivery-Number	653DR