Production of Si3N4 by carbothermal reduction and nitridation of sepiolite
Production of Si3N4 by carbothermal reduction and nitridation of sepiolite
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DOI：
10.1023/a:1004541401063
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发表时间：
1999-02
影响因子：
4.5
通讯作者：
H. Arik;S. Saritas¸;M. Gündüz
中科院分区：
文献类型：
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作者：
H. Arik;S. Saritas¸;M. Gündüz
研究了土耳其海泡石碳热还原和氮化（CTRN）法制备氮化硅粉体的最佳工艺参数。测试样品由99%纯度的- 325目炭黑和- 100目浸出棕色海泡石混合而成，C/SiO2摩尔比为1.5；3;4;5和7.5。制备的样品在1200、1300、1400和1450℃的温度下进行CTRN工艺，时间分别为2、4、8和16小时。CTRN工艺在气氛控制的管式炉中进行，氮气流量为4.5 cm3/min。采用XRD和SEM-EDX对产物进行了转化、形貌和化学成分分析。结果表明，当C/SiO2摩尔比为4时，在1400℃下反应16 h， Si3N4相变效果最佳。
A study was undertaken to determine the optimum parameters for production of Si3N4 powders by carbothermal reduction and nitridation (CTRN) of Turkish sepiolite. Test samples were prepared by mixing 99% purity −325 mesh carbon black and −100 mesh leached brown sepiolite with C/SiO2 molar ratios of 1.5; 3; 4; 5, and 7.5. Prepared samples were subjected to the CTRN process at temperatures of 1200, 1300, 1400 and 1450 °C for 2, 4, 8, and 16 h. The CTRN process was conducted in an atmosphere controlled tube furnace in a nitrogen flow of 4.5 cm3/min. All products were examined by XRD and SEM-EDX to determine the transformation, morphology and chemical composition. The results showed that the best Si3N4 transformation occurred at 1400 °C for 16 h with C/SiO2 molar ratio of 4.