高温埋炭处理对CaO-MgO-SiO_2系陶瓷纤维的影响  

Effect of high temperature carbon-embedded treatment on calcia-magnesia-silica system ceramic fibers

作　　者：刘浩[1] 王玺堂[1] 王周福[1] 张保国[1] 

机构地区：[1]武汉科技大学耐火材料与高温陶瓷国家重点实验室培育基地,湖北武汉430081

出　　处：《耐火材料》2012年第5期337-339,343,共4页Refractories

基　　金：国家自然科学基金资助项目(51004080)

摘　　要：为了评估CaO-MgO-SiO2系陶瓷纤维在还原气氛下的性能表现,采用DTA(测试温度为室温～1 000℃,升温速率分别为5、10、15、20℃.min-1)分析了纤维的晶化行为,通过XRD、SEM-EDS研究了纤维分别于800、1 000、1 200℃热处理2 h后的物相组成(空气和埋炭气氛)及表面形貌(埋炭气氛)等性质。结果表明:纤维的析晶自表面开始;热处理温度的提高加剧了纤维的析晶程度和质量损失,纤维的表面形貌表现为鼓泡、凹凸不平,直至整体析出微米晶体;埋炭处理加剧了晶体的长大及纤维性能的恶化。综合考虑纤维的性质表现,埋炭气氛下,热处理温度在1 200℃以下时,纤维的析晶程度较低。In order to evaluate the performances of calcia-magnesia-silica system ceramic fibers under reductive atmosphere,the crystallization behavior from room temperature to 1000 ℃ with heating rate of 5, 10,15 and 20 ℃ · min-1, respectively,was analyzed by DTA. Phase compositions in air and under carbonembedded atmosphere, and surface morphology under carbon-embedded atmosphere of fibers after firing at 800,1 000 and 1200 ℃ for 2 h,respectively,were researched by XRD and SEM-EDS. The results show that the crystallization starts from the fiber surface; the increase of treatment temperature accelerates the crystallization degree and mass loss of fibers which results in the surface morphology of fibers bubbling and uneven until precipitating with micron crystals; carbon-embedded treatment accelerates the crystal growth and the deterioration of fiber properties. Overall, the crystallization degree of fiber is lower after firing below 1200 ℃ under carbonembedded atmosphere.

关 键 词：CaO-MgO-SiO2系 陶瓷纤维 晶化 埋炭气氛 

分 类 号：TQ175.72[化学工程—硅酸盐工业]