In-situ Observation of Formation of nanosized TiO2powder in Chemical Vapor Condensation

Abstract

The present study has attempted to in-situ observe the formation of nanosized TiOz powder during chemical vapor condensation process. For this purpose, the powders were sampled at various positions in the furnace using a quartz collecting rod of which surface acts as the powder condensation site. It was discussed in terms of size effect on the phase stability that the fine anatase particle transformed to the coarse rutile phase by growing in the high temperature region. Also the parabolic particle growth with the distance of reaction tube was explicated by computated residence time with solving temperature and gas velocity distribution numerically for d@erent oxygen flow rate conditions. 01999 Acta Metallurgica Inc.