二氧化硅碳还原法制取Si3N4粉的研究

报导了用二氧化硅碳还原氮化法制取高性能Ｓｉ３Ｎ４粉的研究结果。研究了氮化温度、氮化时间、氮气流量等工艺因素对氮化产物的颜色、颗粒形状、粒度和粒度分布以及相结构的影响；分析了非晶态、ＳｉＯ２、ＳｉＣ产物的形成条件。结果表明：氮化工艺因素对氨化产物的性能有明显的影响，采用１４５０℃氮化温度，氮化时间２ｈ，Ｎ２流量２．５Ｌ／ｍｉｎ的工艺条件，能制得高α相比例，颗粒微细和粒度分布均匀的优质Ｓｉ３Ｎ４粉。

The Investigation of Preparing Si_3N_4 Powder by Carbon Reduction From SiO_2

he investigating results of preparing high Performance Si3N4 powder by carbon reduction and nitridation from SiO2 is reported in this paper.lt has been studied that the effeCt of the technological factors such as the nitriding temperature,the nitriding time and nitrogen flow,etC.on the colour,particle shape,Pareicle size, particle distribution and phase structure of the nitriding products. The forming conditions of the amorphism,SiO2 and SiC products are discussed.Results show that the nitriding technological factors influence obviously the performances of the nitriding products.High quality St3N. POwder with high a phase ratio,fine particle and homogeneous particle distribution can be prepared by the technological conditions of using the nitriding temperature 1450t,the nitriding time 2h and the nitrogen flow 2.5L/ min.