Yang, Le ; Feng, Yao ; Riedel, Ralf ; Yu, Zhaoju (2022):
Enhanced high‐temperature resistance and magnetic property of SiFeC nanocomposites containing a small amount of boron.
In: International Journal of Applied Ceramic Technology, 19 (2), pp. 784-793. Wiley, ISSN 1546-542X,
DOI: 10.1111/ijac.13897,
[Article]

Abstract

In this paper, the boron-modified polyferrocenylcarbosilanes (namely HBPFCS-Bs) with hyperbranched structure, as single-source-precursors, were successfully prepared by using 9-borabicyclo [3, 3, 1] nonane (9-BBN) and polyferrocenylcarbosilanes (HBPFCSs) as starting materials. The obtained HBPFCS-Bs were characterized using Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (NMR) and gel permeation chromatography (GPC), providing that the boron element can be introduced into the HBPFCS chains by the hydroboration (B-H/C = C) reaction. Then, the structural evolution of HBPFCS-Bs and the boron-containing SiFeC ceramics at different temperatures (1100-1500 degrees C) was further investigated by thermogravimetric analysis, X-ray diffraction, energy dispersive spectroscopy, scanning electron microscope, and transmission electron microscopy. The results show that the incorporation of a small amount of boron (1 wt%) into precursors significantly improves the properties of the final ceramics, including the significant increase of the ceramic yield, enhanced high-temperature resistance, as well as the higher ceramic densification. Finally, the saturation magnetization of the HBPFCS-Bs-derived ceramics was also enhanced by the introduction of boron.

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