氧化硅形態(tài)對合成氮氧化硅粉體的影響
發(fā)布時間：2019-04-29 20:11
【摘要】：研究了使用SiO_2為氧源合成氮氧化硅時,SiO_2的結(jié)晶狀態(tài)對氮氧化硅形貌的影響。實(shí)驗(yàn)使用的SiO_2分別為氣相白炭黑和晶體石英粉末,硅固體為平均粒徑1.15μm左右的粉末。使用X射線衍射儀對合成物進(jìn)行物相分析,并用掃描電子顯微鏡觀察其形貌。結(jié)果表明:使用氣相白炭黑為氧源時,在1 380℃保溫4h的條件下,硅粉與氣相白炭黑的物質(zhì)的量比為2.0∶1~2.6∶1可得到纖維狀氮氧化硅;以晶態(tài)石英為氧源時,在1 450℃保溫4h的條件下,固定硅粉與晶態(tài)石英的物質(zhì)的量比為1.5∶1可得到顆粒狀氮氧化硅。本工作通過對Si-N-O體系的熱力學(xué)分析,討論了不同形貌的氮氧化硅粉體的形成機(jī)制。
[Abstract]:The effect of crystallization state of SiO_2 on the morphology of silicon nitride was studied when SiO_2 was used as oxygen source to synthesize silicon nitrogen oxide. The SiO_2 used in the experiment is gas-phase silica and crystalline quartz powder respectively, and the silicon solid is about 1.15 渭 m in average particle size. X-ray diffractometer was used to analyze the phase of the composite and the morphology of the composite was observed by scanning electron microscope (SEM). The results show that when gas silica is used as oxygen source and kept at 1 380 鈩，
本文編號：2468497
[Abstract]:The effect of crystallization state of SiO_2 on the morphology of silicon nitride was studied when SiO_2 was used as oxygen source to synthesize silicon nitrogen oxide. The SiO_2 used in the experiment is gas-phase silica and crystalline quartz powder respectively, and the silicon solid is about 1.15 渭 m in average particle size. X-ray diffractometer was used to analyze the phase of the composite and the morphology of the composite was observed by scanning electron microscope (SEM). The results show that when gas silica is used as oxygen source and kept at 1 380 鈩，
本文編號：2468497
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