Effect of V2O5 on Sintering Performance of Magnesium Aluminum Spinel Ceramic Materials
In order to explore the effect of additives on the sintering properties of magnesia alumina spinel ceramic materials and the mechanism of action,MgAl2O4 ceramic material was synthesized by solid phase sintering method with MgO and Al2O3 as main raw materials and V2O5 as additive.The mass ratio of Al2O3 and MgO was 2.55∶1,and the mass fractions of V2O5 introduced into the system were 1%,3%,5%and 7%,respectively.The phase composition,micromorphology,apparent porosity and mechanical strength of sintered samples were analyzed.The results show that the addition of V2O5 is less than 5%,V2O5 and MgAl2O4 crystals preferently replace Al3+,and then replace Mg2+when the addition of V2O5 is more than 5%.The defect reaction reduces the diffusion resistance and significantly enhances the interdiffusion rate of ions in the system.The reaction and crystal devel-opment of MgAl2O4 are promoted.When the addition of V2O5 is excessive,V5+has no time to enter the lattice,and is distributed at the grain boundary of MgAl2O4,which hinders the migration and diffusion of particles,and inhibits the sintering process,which is not conducive to the improvement of sintering performance.
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