氧化硅形态对合成氮氧化硅粉体的影响
发布时间：2019-04-29 20:11
【摘要】：研究了使用SiO_2为氧源合成氮氧化硅时,SiO_2的结晶状态对氮氧化硅形貌的影响。实验使用的SiO_2分别为气相白炭黑和晶体石英粉末,硅固体为平均粒径1.15μm左右的粉末。使用X射线衍射仪对合成物进行物相分析,并用扫描电子显微镜观察其形貌。结果表明:使用气相白炭黑为氧源时,在1 380℃保温4h的条件下,硅粉与气相白炭黑的物质的量比为2.0∶1~2.6∶1可得到纤维状氮氧化硅;以晶态石英为氧源时,在1 450℃保温4h的条件下,固定硅粉与晶态石英的物质的量比为1.5∶1可得到颗粒状氮氧化硅。本工作通过对Si-N-O体系的热力学分析,讨论了不同形貌的氮氧化硅粉体的形成机制。
[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，
本文编号：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，
本文编号：2468497
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