Fabrication of continuous ZrB2 nanofibers derived from boron-containing polymeric precursors
Fabrication of continuous ZrB2 nanofibers derived from boron-containing polymeric precursors
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DOI：
10.1016/j.jallcom.2016.12.121
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发表时间：
2017-03
影响因子：
6.2
通讯作者：
X. Tao;Shi-Xiang Zhou;Zhimei Xiang;Jie Ma;RuiLin Hou;Yabo Zhu;Xianyong Wei
中科院分区：
文献类型：
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作者：
X. Tao;Shi-Xiang Zhou;Zhimei Xiang;Jie Ma;RuiLin Hou;Yabo Zhu;Xianyong Wei
采用静电纺丝和聚合物前驱体相结合的方法制备了连续的纳米级陶瓷纤维。以聚硅氧烷(PZO)、2-羟基苯甲醇、硼酸为原料，加入聚乙烯吡咯烷酮(PVP)，制得静电纺丝溶液。研究了溶液性质和B/Zr摩尔比对静电纺丝的影响。用X射线衍射仪、扫描电子显微镜、能谱仪、透射电子显微镜和拉曼光谱对电纺前驱体和热处理后的纳米纤维进行了表征。结果表明，350℃的热解有利于纤维形态的稳定，在1400℃的气氛中热解2h可以得到纳米级的纤维。在所有样品中，ZrB2纳米纤维都保持了良好的纤维形态。ZrB2纳米纤维是由均匀的纳米颗粒组成的。用Scherrer方程计算得到的ZrB_2颗粒平均晶粒尺寸为25 nm。在1400℃的Ar气氛中生成的产物中，锆和硼的原子百分含量分别为17.06%和33.73%，与化学计量比的ZrB2非常接近。
Continuous ceramic nanofibers of ZrB2were synthesized via electrospinning combining with polymeric precursor method. The electrospinning solution was prepared from the reaction of Polyzirconoxane (PZO) with 2-Hydroxybenzyl alcohol and boric acid followed by the addition of polyvinylpyrrolidone (PVP). The influences of the solution properties and B/Zr molar ratio on electrospinning were investigated. The electrospun precursors and heat-treated nanofibers were characterized by XRD, SEM, EDS, TEM and Raman. The results showed that pyrolysis at 350 °C helped to stabilize the fibers morphology and ZrB2nanofibers were obtained by pyrolyzing the precursor fibers at 1400 °C for 2 h in argon. ZrB2nanofibers maintained the excellent fibrous morphology in all the samples. ZrB2nanofibers are composed of uniformly nanosized ZrB2particles. The average crystallite size of ZrB2particles using Scherrer equation is 25 nm. The atomic percentages of zirconium and boron in the product formed in argon at 1400 °C were 17.06% and 33.73% respectively, which is very close to the stoichiometric ZrB2.