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.
出处
《耐火材料》
CAS
北大核心
2014年第2期119-122,共4页
Refractories
关键词
Al2O3-C材料
铝粉
二氧化钛
物相
显微结构
alumina-carbon material
aluminum powder
titanium dioxide
phase
microstructure
