新型溶液喷射法制备氧化铝纤维及性能研究

摘要

结合溶胶-凝胶法及溶液喷射成形方法,制备得到氧化铝初生纤维,经高温煅烧处理,得到氧化铝纤维,对其进行了热性能(TGA)分析及 X射线偏光衍射(XRD)分析.结果表明,纺丝液粘度对初生纤维形貌及直径分布影响较大,当溶液粘度为3．10 Pa•s时,得到的纤维直径分布比较均匀,平均直径为17．76μm,纤维渣球含量少；500℃低温煅烧后,纤维表面光滑,纤维直径较粗,900℃煅烧后,纤维表面出现裂纹等缺陷,纤维直径明显减小,1100℃煅烧后,纤维缺陷仍然存在；初生纤维升温至600℃以上后,有机溶剂挥发完全；经1100℃高温煅烧后,可得到γ-Al2 O3纤维.%Sol-gel and solution blowing techniques were incorporated to produce the as-spun alumina fiber fol-lowed by calcination.The resulting fibers were characterized using optical microscope,TGA and XRD.The re-sults indicate that sol-gel solution viscosity plays the major role in as-spun fiber morphology and fiber diameter distribution.The as-spun fibers with a uniform diameter can be obtained when the solution viscosity was 3.10 Pa•s and the average diameter was 17.76μm.During the thermal treated process,the surfaces of the fi-bers are smooth with the low sintered temperature,whereas the temperature up to 900 ℃,the fibers become more fine and the surfaces was coarsen until 1 100 ℃.It can be found that the organic ingredients pyrolysis com-pletely at 600 ℃.Finally,the resulting fibers withγphase were obtained after 1 100 ℃ sintered treatment.