碳铬渣合成堇青石的反应机理及结构表征  

Reaction Mechanism and Structural Characterization of Cordierite Synthesized from High-carbon Ferrochromium Slag

作　　者：刘川北[1] 张礼华[1,2] 谭克锋[1] 刘来宝[1,2] 唐凯靖[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]东南大学材料科学与工程学院,南京211189

出　　处：《硅酸盐学报》2015年第11期1605-1610,共6页Journal of The Chinese Ceramic Society

基　　金：西南科技大学研究生创新基金(14ycx007);企业委托项目(13zh0042)

摘　　要：以高碳铬铁合金渣、工业氧化铝粉和硅微粉为主要原料,通过高温固相法合成制备堇青石。利用X射线衍射和扫描电子显微镜等研究了烧成温度、保温时间对堇青石材料结晶度、晶粒尺寸、晶相组成和显微结构的影响规律。结果表明:样品中堇青石主要由镁橄榄石进一步反应生成,其最佳烧结制度为1 350℃,保温3 h,堇青石含量在87%左右;随着烧结温度和保温时间升高,样品相对结晶度降低,堇青石晶粒尺寸则逐渐增加,晶胞参数沿a轴晶向轴方向增大,c轴方向减小,晶胞体积变大。铬元素固溶进堇青石晶格是使其晶胞参数变化的主要原因。Cordierite was synthesized by a high-temperature solid state method with high-carbon ferrochromium slag, commercial alumina and silica powder as raw materials. The effects of sintering temperature and holding time on the crystallinity, microstructure and the content of cordierite were investigated by X-ray diffraction and scanning electron microscope as well. The results show that the cordierite synthesized is mainly from the reaction of forsterite and its content can be 87% when sintered under 1 350 ℃ for 3 h. The crystallinity decreases, the grain size of cordierite increases, the lattice parameters increase in the a-axis direction while decreases in c-axis direction, and the lattice volume increases with the increase of sintering temperature and holding time. Chromium incorporated into the cordierite lattice results in the change of the lattice parameters.

关 键 词：碳铬渣 堇青石 结构表征 结晶度 

分 类 号：TQ174.1[化学工程—陶瓷工业]