Processing of High‐Density Magnesia Spinel Electro‐Conducting Ceramic Composite and its Oxidation at 1400°C |
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| Authors: | Zaki Zaki Nasser Mostafa Yasser Ahmed Emad Ewais Mohamed Rashad |
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| Affiliation: | 1. Materials Science and Engineering Group, Chemistry Department, Faculty of Science, Taif University, Taif, Saudi Arabia;2. Advanced Materials Department, Central metallurgical R&D Institute (CMRDI), Cairo, Egypt;3. Chemistry Department, Faculty of Science, Suez Canal University, Ismailia, Egypt |
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| Abstract: | Dense conductive ceramic composites of MgAl2O4 and MoSi2 were processed using combustion synthesis under‐load methodology. The starting reactants were blends of MoO3, SiO2, MgO, and Al powders. The study revealed that to obtain dense composite with homogeneous microstructure, 30 wt. % of MoSi2, 18.5 μm Al 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/cm3, and low electrical resistivity 0.3 Ωcm. The dense composite exhibited excellent thermodynamic stability between its phases at 1400°C in open atmosphere. |
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| Keywords: | composites molybdenum silicide magnesia spinel combustion synthesis |
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