Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9636480 | Powder Technology | 2005 | 10 Pages |
Abstract
The kinetics of SiO vapor ammonolysis to produce nano-sized silicon nitride powder was studied with an 80-mm-diameter vertical tubular flow reactor operated at temperatures ranging from 1300 °C to 1400 °C. The molar feed rate of NH3 was maintained 2-3 orders of magnitude in excess of stoichiometric ratio over SiO. The rate of reaction to form nano-sized powder was represented by a pseudo-first-order rate expression with respect to SiO concentration, independently of NH3 concentration. The temperature dependency of the pseudo-first-order rate constant was determined. The effects of mean residence time as well as the reaction temperature on the growth of nano-sized particles were investigated, and the minimum residence time to produce particles of critical size was estimated.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Panut Vongpayabal, Shoichi Kimura,