Silica to Silicon: Key Carbothermic Reactions and Kinetics

Autor:	Daniel Howard Filsinger, Daniel B. Bourrie
Rok vydání:	1990
Předmět:	chemistry.chemical_classification Reaction mechanism Silicon Inorganic chemistry chemistry.chemical_element Chemical kinetics Reaction rate chemistry Carbothermic reaction Materials Chemistry Ceramics and Composites Sublimation (phase transition) Compounds of carbon Silicon oxide
Zdroj:	Journal of the American Ceramic Society. 73:1726-1732
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1990.tb09820.x
Popis:	The primary carbothermic reactions for the reduction of silica to produce silicon were defined and the reaction kinetics were determined. Most possible reactions between silicon oxide and carbon or carbon compounds were studied by a series of thermogravimetric analyses at temperatures up to 2000°C. Four key sequential reactions occur with SiC and SiO as intermediate reactants; two reactions involve SiO2 and two involve SiO. Reaction rate versus temperature, activation energy, and preexponential factors were determined for each of six reactions involving SiO2 or SiO. These kinetic studies show that SiO, when combined with either carbon or Sic, reacts in the gaseous state, and the sublimation of SiO is not the rate-limiting reaction for forming silicon.
Databáze:	OpenAIRE
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