Research of High Temperature Crystalline Structure and Property Evolution of Magnesium Aluminate Spinel

Magnesium aluminate spinel (MgAl2O4) with high purity has been prepared by materials to discuss the change laws and characteristics of crystalline structure, microstructures and properties. X-ray diffraction (XRD) and scanning electron microscopy (SEM), together with relevant analysis software, were used to characterize the crystal phases and microstructures so as to get MgAl2O4. Results show that when increasing the holding time the amount of MgAl2O4 increases firstly and then keeps stable, but bulk density and bending strength increase firstly and then decrease.The best holding time is determined to be 3 h because at this time the corresponding MgAl2O4 content is up to 93%, bulk density 3.23 g.cm-3, apparent porosity 4.6% and bending strength 122.4 MPa.