The Al-MgAl2O4-Al2O3 specimens of the sliding gate are made from sintered corundum,white fused corundum,α-Al2O3 powder,magnesium aluminate spinel powder and aluminum powder.The MgAl2O4 micro powder contents of the Al-MgAl2O4-Al2O3 composite sliding gate are 3％,6％,9％,12％ and 15％ respectively.The specimens are treated with three different processes (200°C drying,nitriding and CO atmosphere).The results show that the specimens of nitriding and CO atmosphere all have good performance.Especially,the specimen,whose MgAl2O4 micro powder content is 9％ and is treated with CO atmosphere,has relative lower apparent porosity,higher cold crushing strength and hot modulus of rupture,which makes it posses the superior combination property.
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