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Combustion synthesis of C/MgAl 2 O 4 composite powders using magnesium oxalate as carbon source
Author(s) -
Lv Lihua,
Xiao Guoqing,
Ding Donghai,
Ren Yun,
Yang Shoulei,
Yang Pan,
Hou Xing
Publication year - 2018
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/ijac.13134
Subject(s) - materials science , composite number , scanning electron microscope , combustion , carbon fibers , raman spectroscopy , chemical engineering , carbon black , microstructure , oxide , oxalate , nuclear chemistry , metallurgy , inorganic chemistry , composite material , organic chemistry , chemistry , physics , natural rubber , optics , engineering
In order to solve the bottleneck problems including uniform distribution, and oxidation resistance of nano carbons in oxide ceramics, C/MgAl 2 O 4 composite powders were prepared with MgC 2 O 4 ·2H 2 O, MgO 2 , Al 2 O 3 , and Al as raw materials via combustion method under argon atmosphere. The maximum adding amount of MgC 2 O 4 ·2H 2 O is 34.34 wt%. The phase compositions and microstructures of combustion products were characterized through X‐ray diffraction ( XRD ), scanning electron microscope ( SEM )/ EDX , and Raman spectroscopy. The results showed that the phases of products are mainly composed of MgAl 2 O 4 and carbon. The prepared MgAl 2 O 4 has granular and rod‐like morphologies, and the free carbon (1.172 wt%) exists between particles of MgAl 2 O 4 . Moreover, the addition of FeC 2 O 4 as catalyst in raw materials ratio would be beneficial for improving crystallization of in situ carbon generated in the products. The oxidation activation energy of the prepared C/MgAl 2 O 4 composite powders was calculated as 143.01 kJ/mol which was 22.17% higher than that of carbon black/MgAl 2 O 4 powders (117.06 kJ/mol), suggesting that the C/MgAl 2 O 4 composite powders prepared by combustion synthesis have excellent oxidation resistance.