Abstract：Magnesia alumina spinel was prepared from Al2O3, Mg(OH)2 and SrO, with mass fractions of SrO is
0, 0.25%, 0.5%, 0.75% and 1%, respectively. The sintered samples were analyzed by X-ray diffractometer, scan‐
ning electron microscope, apparent porosity and bulk density tester and image processing software. The results
show that after calcination at different sintering temperatures, with the increase of SrO content, the linear shrink‐
age and bulk density of the samples increase first and then decrease, and the apparent porosity decreases first and
then increases. When the addition of SrO is 0.5%, the linear change rate and bulk density are the largest and the
apparent porosity is the smallest. When the sample is sintered at 1 600 ℃ for 3 h, the linear change rate of mag‐
nesium aluminum spinel prepared without SrO after sintering is 4.9%, the apparent porosity is 50.1%, and the
bulk density is 1.64 g/cm3; The linear change rate of magnesia alumina spinel prepared by adding 0.5% SrO is
5.4%, the apparent porosity is 44.3%, and the bulk density is 1.89 g/cm3.
2022, Vol. 32 
