南通大学学报（自然科学版）2026，Vol.25Issue(1)：48-55,8.DOI:10.12194/j.ntu.20251014001
柔性氧化铝基纳米纤维膜的制备及结构调控研究
Preparation and structural control of flexible alumina-based nanofiber membranes
摘要
Abstract
Alumina(Al2O3)nanofiber membranes are promising high-temperature thermal insulation materials with broad applications in aerospace,firefighting,and rescue operations.However,rapid grain growth during phase transfor-mation tends to cause brittle cracking,limiting their practical use.Element doping is an effective strategy to suppress excessive grain growth and improve the high-temperature flexibility of Al2O3-based fiber membranes.In this study,two-dimensional Al2O3-based nanofiber membranes with good flexibility were fabricated by combining sol-gel and electrospinning techniques with the incorporation of Zr and Si as dopants.Scanning electron microscopy(SEM),trans-mission electron microscopy(TEM),and X-ray diffraction(XRD)were employed to investigate the effects of dopant type,doping ratio,and calcination temperature on fiber morphology and crystal structure.Tensile strength and flexural performance were also systematically characterized.The results show that Zr doping significantly reduces grain size and improves flexibility.However,calcination at 1 400 ℃ leads to noticeable grain coarsening and a marked decline in flexibility.In contrast,when Si is used as the dopant at an Al∶Si molar ratio of 6∶1,the resulting Al2O3-SiO2 nanofiber membrane exhibits uniform morphology and a stable mullite phase.This membrane retains good flexibility after calcination at 1 400 ℃.After calcination at 1 000 ℃,it achieves a tensile strength of 1.03 MPa,maintains a flexural stiffness of 70 mN after 500 bending cycles,and shows a low room-temperature thermal conductivity of 0.029 9 W/(m·K),demonstrating excellent overall performance.关键词
氧化铝/纳米纤维/元素掺杂/溶胶-凝胶/静电纺丝/柔性/高温隔热Key words
alumina/nanofiber/element doping/sol-gel/electrospinning/flexibility/high-temperature thermal insulation分类
化学化工引用本文复制引用
张梦娇,李文哲,王文强,张瀚闻,傅秋霞,葛建龙,单浩如..柔性氧化铝基纳米纤维膜的制备及结构调控研究[J].南通大学学报（自然科学版）,2026,25(1):48-55,8.基金项目
国家自然科学基金青年科学基金项目(52003126) （52003126）
江苏省研究生科研与实践创新计划项目(KYCX24_3533) （KYCX24_3533）
