@article{YU2020, 
author = {Zhaoju YU and Yujing YANG and Kangwei MAO and Yao FENG and Qingbo WEN and Ralf RIEDEL},
title = {Single-source-precursor synthesis and phase evolution of SiC-TaC-C ceramic nanocomposites containing core-shell structured TaC@C nanoparticles},
year = {2020},
journal = {Journal of Advanced Ceramics},
volume = {9},
number = {3},
pages = {320-328},
keywords = {polymer-derived ceramics, TaC, SiC, nanocomposites, core-shell structure},
url = {https://www.sciopen.com/article/10.1007/s40145-020-0371-z},
doi = {10.1007/s40145-020-0371-z},
abstract = {A novel single-source-precursor for SiC-TaC-C nanocomposites was successfully synthesized by the chemical reaction between a polycarbosilane (allylhydridopolycarbosilane, AHPCS) and tantalum(V) chloride (TaCl5), which was confirmed by Fourier transform infrared spectra (FTIR) measurement. After pyrolysis of the resultant single-source-precursors at 900 ℃, amorphous ceramic powders were obtained. The 900 ℃ ceramics were annealed at different temperatures in the range of 1200-1600 ℃ to gain SiC-TaC-C nanocomposites. The phase evolution of ceramic nanocomposites was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results indicate that the TaC starts to crystallize at lower temperature than the β-SiC. It is particularly worth pointing out that the unique core-shell structured TaC@C nanoparticles were in-situ formed and homogeneously distributed in the ceramic matrix after annealing at 1400 ℃. Even at a high temperature of 1600 ℃, the grain sizes of β-SiC and TaC are smaller than 30 nm, fulfilling the definition of nanocomposites. The present study related to SiC-TaC-C nanocomposites paves a new road for enriching ultra-high temperature ceramic family suitable for structural/functional applications in harsh environment.}
}