免烧SiC材料的抗冰晶石侵蚀性研究  

Cryolite corrosion resistance of non-fired SiC materials

作　　者：李刚[1] 曹会彦[1] 刘臻[1] Li Gang;Cao Huiyan;Liu Zhen(State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co. ,Ltd. ,Luoyang 471039,Henan,China)

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司先进耐火材料国家重点实验室,河南洛阳471039

出　　处：《耐火材料》2018年第6期467-469,474,共4页Refractories

摘　　要：为解决电解铝行业Si_3N_4结合SiC耐火材料成本高,工艺控制复杂等问题,以工业SiC为主要原料,添加少量Si粉和Al粉,酚醛树脂为结合剂,经120℃烘干制备免烧SiC试样,采用CO_2气氛控制动态侵蚀法结合XRD和SEM研究其1 000℃时的抗冰晶石侵蚀性。结果表明:试样中的酚醛树脂转变为石墨,Si和Al转化为纤维状、粒状、柱状的SiC、Al_2O_3、Al N、Si_3N_4、3Al_2O_3·2SiO_2,以及Al、Si的氮氧化物等较为复杂的陶瓷结合体系,为免烧SiC材料提供了优异的抗冰晶石侵蚀性能。In order to solve the problems of high cost and complex process control of Si3N4 bonded Si C refractories in aluminum electrolysis industry,non-fired Si C specimens were prepared using industrial Si C as the main starting material,adding a small amount of Si powder and Al powder,using phenolic resin as the binder,and drying at 120 ℃. The cryolite corrosion resistance at 1 000 ℃ was studied by CO2 atmosphere dynamic corrosion method combined with XRD and SEM. The results show that the phenolic resin in the specimens transforms into graphite,Si and Al transform into fibrous,granular,and columnar Si C,Al2O3,Al N,Si3N4,3Al2O3·2SiO2,and complex ceramics bonding system of oxynitrides of Al and Si,which provides excellent cryolite corrosion resistance for non-fired Si C materials.

关 键 词：冰晶石 SiC砖 免烧成 抗侵蚀性 物相组成 显微结构 

分 类 号：TQ175[化学工程—硅酸盐工业] TF065.1[冶金工程—冶金物理化学]