Guan Jiasuo, Wang Yaohui, Cheng Laifei, Xie Yupeng, Zhang Litong
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an 710072, China.
Inner Mongolia Synthetic Chemical Engineering Institute, Hohhot 010010, China.
Materials (Basel). 2018 Oct 17;11(10):2003. doi: 10.3390/ma11102003.
Short silicon nitride fibers were fabricated by direct nitridation of ferrosilicon in N₂ atmosphere, and their structure and possible growth mechanism were characterized and investigated. The rod-like fibers which were α-Si₃N₄ with a low degree of crystallization and a high aspect ratio had a diameter of about 4 μm and a length close to a few millimeters. Belt-like fibers with a width about 5 μm and a thickness about 1 μm were also found in the nitrides. Scanning electron microscope (SEM), transmission electron microscope (TEM), high resolution transmission electron microscope (HRTEM), and selected area electron diffraction (SAED) investigations indicated that the fibers were single-crystalline α-Si₃N₄ with few amorphous distributed in the edge region, and the fibers grew by vapor⁻liquid⁻solid (VLS) mechanism.
通过在氮气气氛中对硅铁进行直接氮化制备了短氮化硅纤维，并对其结构和可能的生长机制进行了表征和研究。棒状纤维为α-Si₃N₄，结晶度低且长径比高，直径约为4μm，长度接近几毫米。在氮化物中还发现了宽度约为5μm、厚度约为1μm的带状纤维。扫描电子显微镜（SEM）、透射电子显微镜（TEM）、高分辨率透射电子显微镜（HRTEM）和选区电子衍射（SAED）研究表明，这些纤维是单晶α-Si₃N₄，边缘区域有少量非晶分布，且纤维通过气-液-固（VLS）机制生长。
