Novel Synthesis and Characterization of High Quality Silicon Carbide Coatings on Carbon Fibers

作者：Xie, Wei; Mirza, Zakaria; Moebus, Guenter; Zhang, Shaowei^*

来源：Journal of the American Ceramic Society, 2012, 95(6): 1878-1882.

DOI：10.1111/j.1551-2916.2012.05153.x

• OXIDATION BEHAVIOR
• TEMPERATURE

Carbon fibers were coated with silicon carbide (SiC) by partially reacting with silicon (Si) powders in a NaCl-based salt for 4 h at 1200 degrees C-1250 degrees C in Ar, and characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and energy dispersive X-ray (EDX) analysis. At 1200 degrees C, almost no SiC was formed, whereas at 1250 degrees C Si completely reacted to form SiC coatings on carbon fibers. The molten salt medium is believed to facilitate the dissolution and diffusion of Si and thus the SiC coating formation. The SiC coating thickness could be readily tailored by simply adjusting the Si/C ratio. To illustrate this, two different Si/C weight ratios (1/10 and 1/5) were used, respectively, to prepare a thick (300-350 nm) coating and a thin (similar to 130 nm) coating. Both coatings were found to be continuous, homogeneous, and crack free.

• 出版日期2012-6
• 单位武汉科技大学