Combustion synthesis of C/MgAl2O4 composite powders using magnesium oxalate as carbon source. Issue 3 (14th November 2018)

• Record Type: Journal Article
• Authors: Lv, Lihua; Xiao, Guoqing; Ding, Donghai; Ren, Yun; Yang, Shoulei; Yang, Pan; Hou, Xing
• Is Part Of: International journal of applied ceramic technology. Volume 16:Issue 3(2019)
• Page Start: 1253
• Page End: 1263
• Publication Date: 2018-11-14
• Subjects: C/MgAl2O4 composite powders -- combustion synthesis -- microstructure; Ceramics -- Periodicals; Ceramics -- Technological innovations -- Periodicals; 620.1405
• DOI: 10.1111/ijac.13134
• Languages: English
• ISSNs: 1546-542X

Abstract

Abstract: In order to solve the bottleneck problems including uniform distribution, and oxidation resistance of nano carbons in oxide ceramics, C/MgAl2 O4 composite powders were prepared with MgC2 O4 ·2H2 O, MgO2, Al2 O3, and Al as raw materials via combustion method under argon atmosphere. The maximum adding amount of MgC2 O4 ·2H2 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 MgAl2 O4 and carbon. The prepared MgAl2 O4 has granular and rod‐like morphologies, and the free carbon (1.172 wt%) exists between particles of MgAl2 O4 . Moreover, the addition of FeC2 O4 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/MgAl2 O4 composite powders was calculated as 143.01 kJ/mol which was 22.17% higher than that of carbon black/MgAl2 O4 powders (117.06 kJ/mol), suggesting that the C/MgAl2 O4 composite powders prepared by combustion synthesis have excellent oxidation resistance.