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Indexed by:期刊论文

Date of Publication:2010-06-01

Journal:Gongneng Cailiao/Journal of Functional Materials

Included Journals:EI、PKU、ISTIC、Scopus

Volume:41

Issue:SUPPL. 1

Page Number:117-120

ISSN No.:10019731

Abstract:In order to investigate Ca evaporation behavior in the electron beam melting process, metallurgical-grade silicon was melted in an electron beam furnace with electron beam power kept constant while the melting time changed. And the relationship between yield of Si and Ca content was discussed. The results showed that the content of impurity Ca was significantly decreased in the early period of melting, and then changed slowly with the extension of the melting. The free evaporation of Ca at 2133K, the calculated surface temperature of the liguid silicon, followed first order kinetics. The overall mass transfer coefficient of Ca was determined to be 2.64    10-5m/s, and the removal rate of Ca was controlled by the transfer of Ca atoms from the bulk liquid silicon to liquid/gas phase interface.