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Molten Salt Synthesis and Characterization of Titanium Carbide‐Coated Graphite Flakes for Refractory Castable Applications
Author(s) -
Liu Xiaoguang,
Wang Zhoufu,
Zhang Shaowei
Publication year - 2010
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2010.02529.x
Subject(s) - materials science , eutectic system , molten salt , graphite , titanium carbide , titanium , coating , salt (chemistry) , chemical engineering , carbide , alkali metal , chloride , metallurgy , nuclear chemistry , composite material , alloy , organic chemistry , chemistry , engineering
Titanium carbide (TiC)‐coated graphite flakes were prepared using the low‐temperature molten salt synthesis technique. Titanium (Ti) particles were mixed with graphite in a mass ratio (Ti/C) between 1/5 and 3/5, and reacted in alkali chloride salts at 650–950°C for 4–8 h. The TiC formation reaction was complete in KCl or the KCl–LiCl eutectic salt after 8 h at 850°C, but not in LiCl or NaCl, indicating that the former were more effective than the latter in accelerating the TiC coating formation. Although various Ti/C ratios were used, the TiC formation reaction was complete in all samples heated for 4 h at 950°C, indicating that the amounts/thickness of TiC coatings could be readily tailored for future castable applications. TiC coatings prepared in KCl or the KCl–LiCl eutectic salt (after 4 h at 950°C or 8 h at 850°C) were of high quality: crack free, homogeneous, and comprising nanosized TiC particles. The coating synthesis process is believed to be dominated by the “template‐growth” mechanism.