Effect of the Addition of α-Si₃N₄ on the Direct Nitridation of Silicon Powder at Atmospheric Pressure

Abstract:

Effect of the addition of α-Si₃N₄ on the nitridation of silicon powder was studied at 1550 and atmospheric pressure. Silicon powder of 2.2μm in size and 99.99% in purity was adopted as experimental materials, α-Si₃N₄ powder of 2.2μm in size and 99% in purity was used as diluent, and nitrogen of 99.9993% in purity was used as reaction gas. The morphologies and phase compositions of the products were analyzed by SEM and XRD respectively. The results show that the conversion of silicon is improved considerably by increasing the adding proportion of α-Si₃N₄ diluent. When the adding proportion of α-Si₃N₄ increases from 10% to 50%, the conversion of silicon powder increases from 38% to 92.55%. The content of β-Si₃N₄ in product decreases, after an initial increase, with the adding proportion of α-Si₃N₄ increases, and it reaches the peak point when the adding proportion of α-Si₃N₄ was 30%. The sinterability of silicon nitride decreases as the content of β phase increases, so the adding proportion of α-Si₃N₄ should be kept away from 30%.

• Periodical: Advanced Materials Research (Volume 486)
• Pages: 247-252
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.486.247
• Online since: March 2012
• Authors: Fu Ming Yang, Li Wang, Shao Wu Yin, Yan Hui Li, Chuan Ping Liu, Li Ge Tong
• Keywords: Conversion, Direct Nitridaion of Silicon Powder, SEM, X-Ray Diffraction (XRD), α-Si₃N₄ Diluent

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