Abstract: In order to further improve the performance of Al2O3-ZrO2-C materials，the effect of five different alumina micro-powders on the performance of Al2O3-ZrO2-C slide gate plates are studied with tabular corundum and zirconia-mullite as the main raw materials and phenolic resin as the binder. The results show that：1）With the particle size of alumina micro-powder decreasing gradually, the apparent porosity of the sample increases，the bulk density decreases，and the mechanical properties of the sample at room temperature decrease；2）CL-370 effectively fills the pores due to its bimodal particle size distribution, resulting in a higher bulk density after burning and flexural strength at room temperature of sample A4 than those of sample A3；3）As the particle size of alumina micro-powder gradually reduces，the high temperature flexural strength of the sample increases while the thermal shock resistance decreases.

Key words: Al2O3-ZrO2-C slide gate plate, Alumina micro-powder, Strength, Thermal shock resistance