以粉煤灰和碳黑为原料n(SiO2)/n(C)＝4．2,采用微波加热碳热还原法在1300℃下制备了SiC/AlN复合球体.利用X射线衍射仪(XRD)、拉曼光谱(RS)和扫描电子显微镜(SEM)对 SiC/AlN 复合球体的形貌和结构进行了表征,并分析了其形成机理.结果表明,以炭黑球为模板,粉煤灰提供 Si 源和 Al源,通过微波加热碳热还原氮化反应可以制得具有梯度结构的 SiC/AlN 复合球体.所制备的 SiC/AlN 复合球体具有AlN-多型体的外壳、SiC 纳米线过渡层和SiC晶须与花朵状SiC晶体构成的核心.
SiC/AlN composite spheres were synthesized by a microwave heating and carbothermal reduction nit-ridation method at 1 300 ℃ with commercial carbon and fly ash (the ratio of n(SiO2 )/n(C)is 4.2).The mor-phology and structure of SiC/AlN composite spheres were characterized using X-ray diffraction,raman spectra, scanning electron microscope and energy dispersive spectrometer.And the formation mechanism of SiC/AlN composite spheres is discussed.The results show that SiC/AlN composite sphere with obviously gradient struc-ture has been synthesized by a microwave heating and carbothermal reduction nitridation with commercial car-bon spheres as template and fly ash as silica and aluminum source.SiC/AlN composite spheres are composed of three layers:the shell (AlN-polytype),the transition layer (SiC nanowires),and the core (SiC whiskers and flower-like SiC crystals).
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