SiC/AlN复合球体的制备与表征  

Synthesis and characterization of SiC/AlN composite spheres

作　　者：张磊 寇宵[1] 王雪平 杨久俊[1,2] 

机构地区：[1]天津城建大学材料科学与工程学院,天津300384 [2]天津市软土特性与工程环境重点实验室,天津300384

出　　处：《功能材料》2015年第11期11122-11125,共4页Journal of Functional Materials

基　　金：天津市自然科学基金资助项目(14JCZDJC40800)

摘　　要：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 nitridation method at 1 300 ℃ with commercial carbon and fly ash(the ratio of n(SiO2) /n(C) is 4.2).The morphology 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 structure has been synthesized by a microwave heating and carbothermal reduction nitridation with commercial carbon 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).

关 键 词：SiC/AlN复合球体 微波加热 碳热还原 制备 

分 类 号：TB32[一般工业技术—材料科学与工程]