Calcium aluminate cement(CAC)contents and heat treatment temperature were the main factors affecting strength and thermal shock resistance(TSR)of light-fired steel ladle.The influence of heat treatment temperature(110-1 600 ℃)and CAC contents(1 wt.％-9 wt.％)on microstructure,phase composition,cold modulus of rupture(CMOR),cold crushing strength(CCS),high-temperature modulus of rupture(HMOR)and TSR of corundum-spinel castable were comprehensively studied.The results show that the CMOR and CCS of samples fired at 110-1 000 ℃ increase with the increase in CAC contents,whereas the CMOR and CCS of samples fired at 1400℃ and 1600℃ increase and subsequently decrease.The obtained samples with 5 wt.％CAC content have the highest CMOR and CCS values.The HMOR of sample fired at 1 600 ℃increases firstly and then decreases with the increase in CAC contents(the HMOR is the best at 5 wt.％).The sample with 7 wt.％CAC contents obtains the optimal TSR performance.Therefore,the appropriate CAC addition of corundum-spinel light-fired ladle purging plugs is 5-7 wt.％.
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