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

Abstract

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°C–1250°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°C, almost no SiC was formed, whereas at 1250°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” (~130 nm) coating. Both coatings were found to be continuous, homogeneous, and crack free.

Bioactive core–shell structure of TiC/TiO2/SrCO3 coating on carbon black particles for bone tissue formation: Fabrication, characterization, and biological functions

“…TiC‐coated carbon black particles were prepared via MSS 23–25 . Ti and carbon black reactants were mixed in a molar ratio of 1:8 using an agate mortar and then combined with KCl.…”

Carbonized electrospun cellulose composite nanofibres containing silicon carbide nanoparticles

“…Several methods have been demonstrated for the fabrication of CF/SiC composites; e.g. by coating SiC on the fibre's surface [6], and conventional chemical vapor infiltration methods [7]. The production of CF/SiC composites however has issues with weak interactions between the CF and the SiC nanoparticles and agglomeration of the latter [8,9].…”

In Situ Gas–Solid Reaction and Oxidation Resistance of Silicon Carbide Coating on Carbon Fibers

“…When the temperature is above 400°C, the carbon fibers react with oxygen, which initiates at the fiber–matrix interface. Therefore, modifying interfaces between the matrix and reinforcement can determine the mechanical and physical properties . Among all the methodologies, silicon carbide (SiC) coating has been considered most effective for its excellent oxidation resistance and effective suppression on the interdiffusion and possible chemical reactions between carbon fibers and matrices …”

“…Besides the above‐mentioned solid–solid carbothermal reduction, solid–liquid reaction [e.g., low‐temperature molten salt synthesis (MSS) technique], and gas–solid reaction methods have also been widely researched. The MSS technique can be used to prepare uniform SiC coating at a low temperature (1250°C), but not suitable for continuous carbon fiber fabric.…”