Oxidation Behavior of Amorphous Nano-Si₃N₄ Powders

Abstract:

The traditional method preparing Si₃N₄/Si₂N₂O composite ceramic is to sinter α-Si₃N₄ powder with additives at relatively high temperatures. But the intergranular phase transformed from the sintering additives can degrade the high-temperature mechanical behavior. Amorphous nanoSi₃N₄ is used to fabricate Si₃N₄/Si₂N₂O composite ceramic by its oxidation and nitridation without sintering additives at low temperatures. Thus, it is essential to study the oxidation behavior and mechanism of amorphous nanoSi₃N₄. Amorphous nanoSi₃N₄ powders were oxidized in different atmospheres, at varying temperatures and for various different length of time. The oxidation process and products was analyzed by means of XRD, TGA and FTIR. The results showed that amorphous nanoSi₃N₄ could be oxidized into SiO₂ from 600°C to 1300°C. Below 1300°C, the oxidation became serious as the temperature increased. Besides, the longer the oxidation time and the lager the ratio of O₂/N₂ partial pressure was, the deeper the oxidation level was. When the temperature was above 1300°C, amorphous nanoSi₃N₄ was completely oxidized into SiO₂.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 367-370
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.367
• Online since: March 2014
• Authors: Jiang Bo Wen, Sheng Huang, Hong Jie Wang*
• Keywords: Amorphous Nano-Si₃N₄, Oxidation, Oxygen Content

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