CAJ | 학술논문

以硝酸铝作为铝源、硅溶胶作为硅源、柠檬酸作为稳定剂,通过简单的溶胶-凝胶过程合成超细氧化铝及莫来石粉末.通过X-射线衍射分析(XRD),扫描电子显微镜(SEM)和红外(IR)光谱以最终产物进行分析与表征.XRD结果显示铝凝胶粉经1 200℃煅烧2 h后样品由α-A2O3晶相的氧化铝构成,而铝硅凝胶粉经1 200℃煅烧2 h后样品由斜方结构的莫来石构成.SEM图像显示所得样品为无规则形态,高温煅烧引起粉末的团聚.
이초산려작위려원、규용효작위규원、저몽산작위은정제,통과간단적용효-응효과정합성초세양화려급막래석분말.통과X-사선연사분석(XRD),소묘전자현미경(SEM)화홍외(IR)광보이최종산물진행분석여표정.XRD결과현시려응효분경1 200℃단소2 h후양품유α-A2O3정상적양화려구성,이려규응효분경1 200℃단소2 h후양품유사방결구적막래석구성.SEM도상현시소득양품위무규칙형태,고온단소인기분말적단취.
Ultrafine alumina and mullite powders have been synthesized by a simple sol-gel process using aluminium nitrate as the aluminum source, silicon sol as the silicon source and citrate as the stabilizing agent.X-ray diffraction (XRD), scanning electron microscopy (SEM) and infrared spectroscopy (IR) were used to characterize the heat-treated final powders. XRD results show that the alumina sample sintered at 1 200 ℃ for 2 h consists of α-Al2O3 phase and the mullite sample sintered at 1 200 ℃ for 2 h is mainly composed of orthorhombic mullite phase. SEM results display that the obtained powders are irregular. The aggregation of the powders is caused by the high temperature.