氮化温度对直接氮化法制备氮化硅纤维材料显微结构的影响
China's Refractories（2020）
Abstract
用工业硅粉为原料,首先通过发泡法结合凝胶注模制备硅的多孔坯体,然后高温氮化制备氮化硅纤维材料,借助XRD和SEM研究氮化温度对该材料显微结构的影响.结果表明:在1400℃氮化5 h,已经基本完全氮化,并且坯体在1375℃发生了剧烈的反应.氮化硅纤维主要在气孔中生长,生成的氮化硅纤维均为纳米纤维,其直径在50～250 nm,长度约10μm.随着氮化温度的升高,氮化硅纤维逐渐增多,泡沫孔壁趋于消失,孔壁的消失是由于SiO的生成.氮化硅纤维生长遵循VS和VLS机制.
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