Abstract: Abstract：MgO-Al2O3-C slide plates are suitable for casting calcium-treated steel. The influences
of magnesia types on the performance of slide plates are compared in this paper. The results
show that fused magnesia and sintered magnesia have little difference in the effects on the bulk
density，porosity，compressive strength, linear expansion rate（at 1 500 ℃）, slag resistance
and hydration resistance of the samples. However，the samples with sintered magnesia have
lower flexural strength at both room temperature and high temperature，but better thermal shock
resistance；while those with fused magnesia have little linear change on reheating and good
oxidation resistance.

Key words: Magnesia type, MgO-Al2O3-C, Slide plate, Performance