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

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.

Simultaneous synthesis and sintering of TiC/Al2O3 composite via self propagating synthesis with direct consolidation technique

“…Ceramic materials prepared by combustion synthesis (SHS) are reported to be purer and require less energy to be produced than by conventional methods [10]. As a result, it is recognized as one of the emerging approaches to synthesize refractory ceramic materials [11][12][13][14]. The principal of this technique is that initial reagents, when heated to suitable temperatures, spontaneously transform into product due to the exothermic heat of reaction.…”