ZrB2-ZrC composite nanofibers fabricated by electrospinning and carbothermal reduction: Processing, phase evolution and tensile property
ZrB2-ZrC composite nanofibers fabricated by electrospinning and carbothermal reduction: Processing, phase evolution and tensile property
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静电纺丝和碳热还原制备ZrB2-ZrC复合纳米纤维：加工、相演化和拉伸性能
DOI：
10.1016/j.jallcom.2018.08.304
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发表时间：
2019-01
影响因子：
6.2
通讯作者：
Tang Yufei
中科院分区：
文献类型：
--
作者：
Li Fuping;Xu Zhuoli;Zhao Kang;Tang Yufei
采用静电纺丝和碳热还原法制备了ZrB2-ZrC复合纳米纤维。对其形貌、相组成和界面进行了表征。制备的ZrB2-ZrC复合纳米纤维均匀，直径约为100 nm。系统研究了热处理温度、n(B)/n（Zr）和n(C)/n（Zr）对复合纳米纤维微观结构和相组成的影响。结果表明，热处理温度对ZrB2-ZrC复合纳米纤维的相组成和晶粒尺寸有影响。ZrB2-ZrC复合纳米纤维中ZrC的含量可以通过前驱体中n(B)/n（Zr）的值来调节。当n(B)/n(Zr) = 3.5时，zrb2与ZrC的质量比约为48:52，这与ZrB2-ZrC复合材料的共晶组成非常接近。n(C)/n（Zr）值也影响复合纳米纤维的相组成。在反应热力学分析的基础上，研究了热处理的反应过程和相演化。在制备ZrB2-ZrC复合纳米纤维过程中，n(B)/n（Zr）值影响着相演化。拉伸力学性能测试表明，ZrC的加入能够提高ZrB2的塑性。
ZrB2-ZrC composite nanofibers were fabricated by electrospinning and carbothermal reduction. The morphology, phase composition and interface were characterized. The fabricated ZrB2-ZrC composite nanofibers are uniform and the diameter is about 100 nm. The effects of heat-treatment temperature, n(B)/n(Zr) and n(C)/n(Zr) on the microstructure and phase composition of composite nanofibers were systematically investigated. The results shows heat-treatment temperature has influence on the phase composition and grain size of the ZrB2-ZrC composite nanofibers. The content of ZrC in the ZrB2-ZrC composite nanofibers can be adjusted by the value of n(B)/n(Zr) in the precursors. As n(B)/n(Zr) equal to 3.5, the mass ratio between ZrB2and ZrC is about 48:52 which is very close to the eutectic composition of ZrB2-ZrC composites. The value of n(C)/n(Zr) also affects the phase composition of composite nanofibers. Reaction process and phase evolution during heat-treatment were studied based on analysis of reaction thermodynamics. The value of n(B)/n(Zr) influences the phase evolution during fabrication of ZrB2-ZrC composite nanofibers. The tensile mechanical properties were tested, indicating that the addition of ZrC has the ability to improve the plasticity of ZrB2.
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