Abstract: Abstract：Tabular corundum particles and fused spinel particles as aggregates，tabular corundum
fine powder，sintered or fused spinel fine powder，and reactive α-Al2O3 micro powder as the
matrix, and high-purity calcium aluminate cement as the binder，are cast with vibration，and then
calcined to 1 550 ℃ to prepare corundum spinel samples. The effects of chemical composition，
phase composition and particle size distribution of sintered spinel fine powder and fused spinel
fine powder from different suppliers on the microstructure，permanent linear change rate after
sintering，apparent porosity，bulk density，flexural strengths at room temperature and high
temperature and compressive strength at normal temperature of corundum spinel castables are
studied.

Key words: Alumina-magnesia spinel, Corundum spinel castables, Thermal shock stability,
Flexural strength, Compressive strength