Kinetics Analysis of Direct Nitridation of Silicon Powders at Atmospheric Pressure

Abstract:

Silicon nitride powders were prepared via direct nitridation of silicon powders diluted with -Si₃ N₄ at atmospheric pressure. The nitridation temperature and time were ranged from1623K to 1823K and from 0 minute to 20 minutes respectively. Based on the relations between the conversion rate of silicon and the time at different temperatures, and using shrinking core model, a simple model for the reaction between silicon and nitrogen was derived. The model showed that the relations between the conversion rate of silicon and the time displayed asymptotic exponential conversion trend. Using this model, the kinetics parameters of nitridation of silicon powder at atmospheric pressure were calculated, including pre-exponential factor in Arrhenius equation, activation energy, effective diffusion coefficient, and the formula of the reaction rate constant.

• Periodical: Advanced Materials Research (Volumes 562-564)
• Pages: 167-170
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.562-564.167
• Online since: August 2012
• Authors: Shao Wu Yin, Li Wang, Li Ge Tong, Fu Ming Yang, Yan Hui Li
• Keywords: Activation Energy, Direct Nitridation, Kinetic, Shrinking Core Model, Silicon Nitride

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