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Novel Synthesis and Characterization of High Quality Silicon Carbide Coatings on Carbon Fibers
Author(s) -
Xie Wei,
Mirza Zakaria,
Möbus Guenter,
Zhang Shaowei
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05153.x
Subject(s) - materials science , scanning electron microscope , silicon carbide , coating , dissolution , silicon , carbon fibers , chemical engineering , molten salt , carbide , salt (chemistry) , diffusion , composite material , analytical chemistry (journal) , metallurgy , chemistry , composite number , organic chemistry , physics , engineering , thermodynamics
Carbon fibers were coated with silicon carbide ( S i C ) by partially reacting with silicon ( S i) powders in a N a C l‐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 S i C was formed, whereas at 1250°C S i completely reacted to form S i C coatings on carbon fibers. The molten salt medium is believed to facilitate the dissolution and diffusion of S i and thus the S i C coating formation. The S i C coating thickness could be readily tailored by simply adjusting the S i/ C ratio. To illustrate this, two different S i/ 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.