Processing of High‐Density Magnesia Spinel Electro‐Conducting Ceramic Composite and its Oxidation at 1400°C | Zendy

Zaki Zaki | Zendy; Mostafa Nasser | Zendy; Ahmed Yasser | Zendy; Ewais Emad | Zendy; Rashad Mohamed | Zendy

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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.

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