The chrome-containing corundum castables specimens with different nano-CaCO3 additions （0-1.6 wt%） were prepared using tabular corundum,alumina powder,chrome oxide micropowder （average particle size 〈 5 μm）,calc...The chrome-containing corundum castables specimens with different nano-CaCO3 additions （0-1.6 wt%） were prepared using tabular corundum,alumina powder,chrome oxide micropowder （average particle size 〈 5 μm）,calcium aluminate cement （Secar71）,commercial nano-CaCO3 （average particle size 〈100 nm） as main starting materials and FS10 as water reducer. The specimens heat treated at 1 000 ℃ and 1 600 ℃ were characterized in terms of apparent porosity,bulk density,cold and hot strengths,and microstructure. The results show that,when the nano-CaCO3 addition is no more than 1.0 wt%,the apparent porosity of the castables increases with nano-CaCO3 addition increasing,both the cold and hot strengths are enhanced; however,when the nano-CaCO3 addition excesses 1.0 wt%,both the cold and hot strengths go down remarkably with nano-CaCO3 addition increasing; the thermal shock resistance is gradually improved with nano-CaCO3 addition increasing in chosen range.展开更多
文摘The chrome-containing corundum castables specimens with different nano-CaCO3 additions （0-1.6 wt%） were prepared using tabular corundum,alumina powder,chrome oxide micropowder （average particle size 〈 5 μm）,calcium aluminate cement （Secar71）,commercial nano-CaCO3 （average particle size 〈100 nm） as main starting materials and FS10 as water reducer. The specimens heat treated at 1 000 ℃ and 1 600 ℃ were characterized in terms of apparent porosity,bulk density,cold and hot strengths,and microstructure. The results show that,when the nano-CaCO3 addition is no more than 1.0 wt%,the apparent porosity of the castables increases with nano-CaCO3 addition increasing,both the cold and hot strengths are enhanced; however,when the nano-CaCO3 addition excesses 1.0 wt%,both the cold and hot strengths go down remarkably with nano-CaCO3 addition increasing; the thermal shock resistance is gradually improved with nano-CaCO3 addition increasing in chosen range.
