| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 236543 | Powder Technology | 2014 | 5 Pages |
•Si3N4 wires were prepared by CTRN reaction of silica gel.•Carbon particles obtained by the decomposition of Saccharose at high temperature.•The mass ratio of 0.5 and 1400 is proposed for the preparation of Si3N4 wires.•With an increase in the reaction temperature, the Si3N4 have transformation of.•The morphology of sample varies from particle to wire at high temperature.
Silicon nitride ultrafine powders were synthesized from a binary sol–gel route, in which tetraethoxysilane (TEOS) and saccharose were used to prepare a carbonaceous silica xerogel, and ferric nitrate was employed as an additive. The influence of reaction temperature and mass ratio of C to Si (CSi = 0.1, 0.5, 1) on the synthesis of Si3N4 wires was studied. After purification, the Si3N4 sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectrum and Fourier transform infrared spectroscopy. The results show that the Si3N4 was fully formed with two kinds of morphologies including globular and wire with a diameter of 100–500 nm and a length of several microns at reaction temperature of 1400 °C for 10 h in nitrogen flow (200 ml/min) by employing the mass ratio of CSi = 0.5.
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