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Hexagonal Plate‐like Ternary Carbide Particulates Synthesized by a Carbothermal Reduction Process: Processing Parameters and Synthesis Mechanism
Author(s) -
Lee JinSeok,
Lee SeaHoon,
Nishimura Toshiyuki,
Tanaka Hidehiko
Publication year - 2009
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.1551-2916.2009.03056.x
Subject(s) - carbothermic reaction , materials science , ternary operation , crystallinity , nucleation , carbide , chemical engineering , carbon fibers , hexagonal crystal system , ternary compound , metallurgy , mineralogy , composite material , crystallography , inorganic chemistry , chemistry , composite number , organic chemistry , computer science , engineering , programming language
Aluminum‐containing ternary carbide, Al 4 SiC 4 , was successfully synthesized using a mixture of Al(OH) 3 , SiO 2 , and phenolic resin by a carbothermal reduction process without any posttreatment. In addition, the processing parameters were optimized in this study. Unlike the JCPDS pattern of Al 4 SiC 4 , the powder has a highly aligned structure along the c ‐axis, indicating a hexagonal plate‐like morphology. The growth rate of particulates was higher than the nucleation rate as the carbon content decreased. The crystallinity (formation yield) of Al 4 SiC 4 was much more dependent on the ratio of carbon to oxides than on the ratio of SiO 2 to Al(OH) 3 . Possible reaction mechanisms responsible for the synthesis of ternary carbide are discussed by considering reactions at the initial and later stages during the carbothermal reduction process.