TiO_2对C-Al体系物相和显微结构的影响  

Effect of TiO_2 on phase and microstructure of C-Al system

作　　者：孙丽[1] 魏军从[1,2] 涂军波[1] 吉秀梅[1] 

机构地区：[1]河北联合大学材料科学与工程学院河北省无机非金属材料重点实验室,河北唐山063009 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《耐火材料》2014年第2期119-122,共4页Refractories

摘　　要：为了研究TiO2对含Al的Al2O3-C材料的物相和显微结构的影响,按石墨、铝粉、二氧化钛粉的质量分数分别为20%、40%、40%配料,以酚醛树脂为结合剂,制成C-Al-TiO2试样,分别在800、1 000、1 200、1 400和1 600℃保温3 h埋炭热处理后,进行XRD和SEM分析。结果表明:800℃埋炭热处理后试样中有少量Al4C3和AlN生成,TiO2未参与反应;1 000℃热处理后,试样中纤维状的Al4C3和AlN生成量增加,同时生成粒状的Al2O3、Al4O4C、Al2OC和TiC;1 200℃热处理后,Al2O3和TiC增加,Al4C3和AlN纤维发育粗化;1 400℃热处理后,纤维状的Al4C3和AlN减少,生成的Al2O3和TiC增多;1 600℃热处理后,试样中Al4C3大量减少,AlN基本消失,颗粒状的Al2O3和TiC则增多,由Al4C3或AlN氧化生成的部分Al2O3呈无定形态。Abstract ：In order to study the effect of TiO2 on the phase and microstructure of Al2O3-C material containing Al,the C-Al-TiO2 specimens were prepared using graphite （40 mass% ）, aluminum powder（40 mass% ）, titanium dioxide （20 mass%） as starting materials and phenolic resin as binder. The specimens were car- bon embedded fired at 800,1 000, 1 200,1 400 and 1 600 ℃ for 3 h, respectively. XRD and SEM were con- ducted to analyze the phase composition and microstructure. The results show that after firing at 800 ℃ small amounts of Al4C3 and AIN form and TiO2 does not react;after firing at 1 000 ℃,fibrous AlaC3 and AIN increase,and granular AI203 ,Al4O4C,Al2OC and TiC form ;after firing at 1 200 ℃,AI203 and TiC increase, Al4C3 and AIN fibers develop and thicken;after firing at I 400 ℃,fibrous AI4C3 and AIN decrease,Al2O3 and TiC increase;after firing at 1 600 ℃,Al4C3 largely decreases,AIN basically disappears,granular AI203 and TiC increase;AI203 generated by the oxidation of AI4C3 or AIN exist in amorphous state.

关 键 词：Al2O3-C材料 铝粉 二氧化钛 物相 显微结构 

分 类 号：TQ175[化学工程—硅酸盐工业]