静电纺丝法制备YAG-ZrO2复合纳米纤维

运用静电纺丝技术结合热处理工艺成功制备了形貌光滑、尺寸均匀的YAG-ZrO₂复合纳米纤维.采用XRD、FT-IR和SEM探索了电压与浓度对复合纤维物相及形貌的影响.结果表明:电压为25 kV、PVA质量分数为11%时得到表面光滑、尺寸均一的复合纤维前躯体.前驱体纤维经过1 200 ℃煅烧5 h后,具有较高的结晶度,直径约为500 nm且比较均匀.为了使YAG-ZrO₂纤维增强的复合材料具有自检性,研究了YAG-ZrO₂纤维的发光性能,发现用290 nm紫外光激发YAG-ZrO₂:Tb³⁺复合纳米纤维,在581 nm处出现明显的发射峰,并发出绿光,这一现象属于Tb³⁺的⁴D₄→⁷F₄跃迁.应力-发光实验结果表明,YAG-ZrO₂:Tb³⁺纤维可以实现对铝基复合材料应力-应变的检测.

Preparation of YAG-ZrO2 composite nanofibers by electrospinning

YAG-ZrO₂ composite nano-fibers with smooth morphology and uniform size were successfully prepared by electrospinning and heat treatment. Effects of voltage and concentration on the phase and morphology of composite fibers were studied by XRD, FT-IR and SEM in this research. Obtained results show that the composite fiber has a smooth surface and uniform size if voltage of 25 kV and the PVA content of 11% applied. After annealing at 1 200 ℃ for 5 h, the precursor fiber has a higher crystallinity and a uniform diameter of about 500 nm. In order to make the YAG-ZrO₂ fiber reinforced composites, which possesses the function of self-testing, the luminescence properties of YAG-ZrO₂ fibers were also investigated. It was found that sharp emission peaks at 581 nm were detected when YAG-ZrO₂:Tb³⁺ composite nanofibers were excited by 290 nm UV light, emitting green light as well. This phenomenon belongs to the ⁴D₄→⁷F₄ transition of Tb³⁺. Stress-luminescence experiment results show that YAG-ZrO₂:Tb³⁺ fiber could detect the stress and strain of aluminum matrix composites.