Effects of firing process on the composition, structure, and properties of near stoichiometric SiC fiber
Year: 2024
Type: article
Abstract: Two kinds of near-stoichiometric SiC fibers were prepared through the pyrolysis of oxygen-free cured polycarbosilane fibers at 1,000 °C within a controlled hydrogen atmosphere, followed by sintering at 1,500 °C under a nitrogen atmosphere by one-step and two-step firing processes. The compositions, structures, and properties of the obtained SiC fibers were characterized using elemental analysis, mechanical performance testing, X-ray diffraction analysis, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. Silicon radicals were generated in the process of hydrogen firing which readily reacted with oxygen to form SiO 2 or SiC x O y phases on the fiber surface, resulting in the obtained fibers exhibited a gradient in compositional distribution across the radial direction, with higher oxygen content at their surfaces and higher carbon content at their cores. The strength of one-step-fired SiC fiber exceeded 1 GPa after treatment at 1,800℃ in argon and 1,500℃ in air for 1 h.
Source: Materials & Design
Authors: Wenxing Zhao, Yuanfeng Gan, Xiaozhou Wang
Institution: National University of Defense Technology
Language: English
Subfield: Ceramics and Composites
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,200
OpenAlex ID: W4404145039