还原气氛下SiO_2在Al_2O_3-Al-C材料中作用机理研究  

Study on Mechanism of SiO_2 on Al_2O_3-Al-C Material at Reducing Atmosphere

作　　者：栾舰[1,2] 王春艳[2,3] 杨红[1] 孙加林[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]辽宁科技大学高温材料与镁资源工程学院,鞍山114051 [3]营口青花集团耐火材料研究院,营口115100

出　　处：《人工晶体学报》2013年第5期976-980,共5页Journal of Synthetic Crystals

摘　　要：本试验借助金属过渡塑性相理论,在Al2O3-C系耐火材料中引入中金属铝粉和SiO2粉,研究空气气氛埋碳条件,不同烧成温度下Al、SiO2的高温反应行为及产物的变化。对烧成后的试样进行XRD物相检测及SEM显微结构分析,发现不添加SiO2的试样中单质Al已经不存在,在材料的气孔中生成大量AlN纤维;添加SiO2的试样中单质Al和SiO2都已经不存在,且形成了大量纤维及六方片状晶体,经XRD及EDS检测,确定该物相为SiAl5O2N5。The reaction mechanism at high-temperature of Al and SiO2 in the Al2O3-C system was studied,with plastic phase metal transition theory,that metallic aluminum powder and SiO2 introduced into Al2O3-C system refractory powder under the air atmosphere condition of bury carbon at different firing temperature.The samples after buried in carbon firing for 2 h were determined by XRD phase detection and structural analysis of SEM images.The results showed that there is no Al present in sample without SiO2,and a large number of AlN fibers present in the pores of the material.Al and SiO2 no longer exist in the sample added with SiO2,and a large number of fibers and hexagonal plate-like crystals detected by XRD and EDS to determine the phase of SiAl5O2N5.

关 键 词：还原气氛 SIO2 Al2O3-Al-C 反应机理 

分 类 号：TQ175.713[化学工程—硅酸盐工业]