Premium
Processing of High‐Density Magnesia Spinel Electro‐Conducting Ceramic Composite and its Oxidation at 1400°C
Author(s) -
Zaki Zaki,
Mostafa Nasser,
Ahmed Yasser,
Ewais Emad,
Rashad Mohamed
Publication year - 2016
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.12537
Subject(s) - materials science , composite number , spinel , microstructure , ceramic , electrical resistivity and conductivity , porosity , composite material , combustion , metallurgy , chemistry , engineering , electrical engineering
Dense conductive ceramic composites of MgAl 2 O 4 and MoSi 2 were processed using combustion synthesis under‐load methodology. The starting reactants were blends of MoO 3 , SiO 2 , MgO , and A l powders. The study revealed that to obtain dense composite with homogeneous microstructure, 30 wt. % of MoSi 2 , 18.5 μm A l average particle size, and 175 MPa load are required. The produced dense composite was found to have a low apparent porosity (<1.0 vol. %), moderate density 4.61 g/cm 3 , and low electrical resistivity 0.3 Ωcm. The dense composite exhibited excellent thermodynamic stability between its phases at 1400°C in open atmosphere.