Effect of Raw Material Composition on Microstructures and Properties of Microporous Periclase-Composite Spinel(Mg(Fe,Al)2O4)Ceramics
In the work,microporous periclase-composite spinel(Mg(Fe,Al)2O4)ceramics was successfully prepared using calcined MgO,Fe2O3 and Al(OH)3 as raw materials by in-situ decomposition synthesis.Meanwhile,the effects of raw material on its microstructures and properties were studied.The results show that when the periclase-composite spinel(Mg(Fe,Al)2O4)content is 0％(mass fraction,the same below),less neck connection form in the sample as well as the compressive strength is low.When the theoretical periclase-composite spinel(Mg(Fe,Al)2O4)content is 4％～16％,the content of the liquid increases and the mass transport accelerates.Then,lots of neck connections form and the compressive strength is high.When the theoretical periclase-composite spinel(Mg(Fe,Al)2O4)content is 24％,the expansion amounts caused by the formation of composite spinel increase so the inter-particle pore size increases and the neck connections decrease.Therefore,the compressive strength of the sample decreases.When the theoretical periclase-composite spinel(Mg(Fe,Al)2O4)content is 12％～16％,microporous periclase-composite spinel(Mg(Fe,Al)2O4)ceramics has excellent comprehensive properties,the apparent porosity of 22.3％～24.6％,the bulk density of 2.75～2.80 g/cm3,the compressive strength of 100.6～123.1 MPa.
microporous ceramicspericlase-composite spinel(Mg(Fe,Al)2O4)raw material compositionin-situ decomposition synthesis methodmicrostructurecompressive strength
国家科技期刊平台
NSTL
万方数据
