无机材料学报2017，Vol.32Issue(7)：739-743,5.DOI:10.15541/jim20160618
复合莫来石纤维前驱体结晶行为研究
Crystallization Behavior of Hybrid Mullite Fiber Precursors
摘要
Abstract
Glass free fine-grained microstructure is ideal for preparing mullite fibers with good high temperature mechanical properties. Single phase/diphasic mullite hybrid precursor was adopted to adjust crystalline microstruc-ture of mullite fibers without adding any glass formers. The single phase precursor crystallized in situ to form mul-lite at 980℃ acting as seed crystals for diphasic components in hybrid precursors to induce the formation of mullite crystals at low temperatures. A series of spinnable hybrid mullite precursors were prepared by mixing single phase and diphasic mullite precursors, and their high temperature crystallization behaviors were investigated by XRD, DSC and SEM, with which optimum formulation of hybrid precursor was determined. The results reveal that hybrid precursor containing 70wt% single phase component has ideal crystalline properties and densification characteris-tics, with fine grain, uniform, and dense structure. Compared with the pure diphasic mullite precursor, the introduc-tion of 70wt% single phase precursor resulted in an increase in apparent nucleation from 8×1012/cm3 to 1×1015/cm3, and a reduction in grain size from 360 nm to 120 nm after heat-treatment at 1400℃ for 20 h.关键词
莫来石纤维/复合莫来石前驱体/结晶行为Key words
mullite fiber/hybrid mullite precursor/crystallization behavior分类
化学化工引用本文复制引用
马西飞,林根连,康庄,黄晓..复合莫来石纤维前驱体结晶行为研究[J].无机材料学报,2017,32(7):739-743,5.基金项目
国家自然科学基金(51302289) （51302289）
上海市自然科学基金(13ZR1445800)National Natural Science Foundation of China(51302289) （13ZR1445800）
National Science Foundation of Shanghai(13ZR1445800) （13ZR1445800）
