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Control on nanostructured quaternary Ti–Al–O–B composite synthesized via electrospinning method, from nanoparticles to nanowhiskers
Journal of Sol-Gel Science and Technology ( IF 2.3 ) Pub Date : 2021-02-19 , DOI: 10.1007/s10971-021-05487-0
Zohreh Ghadimi , Hamid Esfahani , Yousef Mazaheri

The nanostructured powder of multicomponent oxides, borides, and borates is widely used due to its high hardness, corrosion resistance, high melting point, insulating, and abrasive. In the present work, the effect of boron content on the morphology of electrospun multicomponent oxide, boride, and borate nanostructures in a quaternary Ti–Al–O–B system was investigated. Different molar ratios of B/(Ti + Al) (0.8, 1.6, and 2.4) were employed and evaluated. Imaging with the field emission scanning electron microscope (FESEM) and the transmission electron microscope (TEM) revealed that after one hour of thermal treatment at 1100 °C, the hybrid electrospun nanofibers (NFs) in the fibrous platform transformed into nanoparticles (NPs), nano-needles, and nano-whiskers at B/(Ti + Al) molar ratios of 0.8, 1.6, and 2.4, respectively. The binding energies were investigated by X-ray photoelectron spectroscopy (XPS), whereas the phase study was conducted via the X-ray diffraction (XRD) technique. The results confirmed the formation of nanostructured ceramic powder platforms composed of multiple components, namely oxides (e.g., B-doped TiO2; Al2O3), borides (TiB, TiB2, Ti2B5, TiB12, and AlB2), and borates (TiBO3; Al18B4O33). Simultaneous thermal analysis (STA) of the Ti–Al–O–B mats indicated that the borides and borates formed consecutively at temperatures above 800 °C through reactions involving molten B2O3. We found that the obtained NPs were well arranged and sintered together throughout the fibers.



中文翻译:

通过电纺方法从纳米粒子到纳米晶须的纳米四元结构Ti-Al-O-B复合材料的控制

多组分氧化物,硼化物和硼酸盐的纳米结构粉末由于其高硬度,耐腐蚀性,高熔点,绝缘性和研磨性而被广泛使用。在当前的工作中,研究了硼含量对四元Ti-Al-O-B体系中电纺多组分氧化物,硼化物和硼酸盐纳米结构形态的影响。使用和评估不同的B /(Ti + Al)摩尔比(0.8、1.6和2.4)。使用场发射扫描电子显微镜(FESEM)和透射电子显微镜(TEM)进行成像后发现,在1100°C的温度下进行了1小时的热处理后,纤维平台中的混合电纺纳米纤维(NFs)转变为纳米颗粒(NPs), B /(Ti + Al)摩尔比分别为0.8、1.6和2.4的纳米针和纳米晶须。通过X射线光电子能谱(XPS)研究了结合能,而通过X射线衍射(XRD)技术进行了相研究。结果证实了由多种成分组成的纳米结构陶瓷粉末平台的形成,即氧化物(例如,B掺杂的TiO2 ; Al 2 O 3),硼化物(TiB,TiB 2,Ti 2 B 5,TiB 12和AlB 2)和硼酸盐(TiBO 3; Al 18 B 4 O 33)。Ti-Al-O-B垫的同时热分析(STA)表明,硼化物和硼酸盐在800°C以上的温度下通过涉及熔融B 2 O 3的反应连续形成。我们发现,所获得的NP排列整齐并在整个纤维中烧结在一起。

更新日期:2021-02-19
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