In order to improve the performance of Al_(2)O_(3)-SiC-C castables for iron trough,samples were prepared using brown corundum,dense corundum,activated alumina micropowder,ball pitch,and silicon as main raw materials,c...In order to improve the performance of Al_(2)O_(3)-SiC-C castables for iron trough,samples were prepared using brown corundum,dense corundum,activated alumina micropowder,ball pitch,and silicon as main raw materials,calcium aluminate cement as the binder.Several kinds of silica fumes(93SiO_(2),96SiO_(2),and 99SiO_(2))with different particle size distributions and chemical composition were added to research the effects on the properties of castables.The results show that the sample with 99SiO_(2) fume has high water requirement for molding,but the bulk density is the lowest,the apparent porosity is the highest,the oxidation resistance is the worst,and the permanent linear change on heating is low after firing at 1 450 ℃ for 3 h.The bulk density and the apparent porosity of the sample with 93SiO_(2) fume or 96SiO_(2) fume are equivalent,the hot modulus of rupture of the sample with 93SiO_(2) fume is the lowest,and the slag resistance of the sample with 96SiO_(2) fume is the best.The comprehensive performance of the sample with 96SiO_(2) fume is the best.展开更多
采用静态坩埚法进行了Sialon增强Al2O3 SiC C铁沟浇注料的抗渣实验。结果表明,该种铁沟料具有比传统铁沟料更优异的抗渣性能。通过X 射线衍射和SEM分析可知,其抗渣机理为:添加的Si3N4,Si与Al2O3发生原位反应生成Sialon,使材料内部结合...采用静态坩埚法进行了Sialon增强Al2O3 SiC C铁沟浇注料的抗渣实验。结果表明,该种铁沟料具有比传统铁沟料更优异的抗渣性能。通过X 射线衍射和SEM分析可知,其抗渣机理为:添加的Si3N4,Si与Al2O3发生原位反应生成Sialon,使材料内部结合更加紧密,并且生成的Sialon活性较高,氧化放出气体,阻止熔渣的渗入;其次,Sialon向熔渣中溶解,使熔渣成为含N的高硅玻璃,粘度增大;此外,Al2O3与熔渣的MgO反应生成MgAl2O4,形成一阻挡层,这也是Sialon增强Al2O3 SiC C浇注料具有优异的抗渣渗透及侵蚀性能的重要原因。展开更多
文摘In order to improve the performance of Al_(2)O_(3)-SiC-C castables for iron trough,samples were prepared using brown corundum,dense corundum,activated alumina micropowder,ball pitch,and silicon as main raw materials,calcium aluminate cement as the binder.Several kinds of silica fumes(93SiO_(2),96SiO_(2),and 99SiO_(2))with different particle size distributions and chemical composition were added to research the effects on the properties of castables.The results show that the sample with 99SiO_(2) fume has high water requirement for molding,but the bulk density is the lowest,the apparent porosity is the highest,the oxidation resistance is the worst,and the permanent linear change on heating is low after firing at 1 450 ℃ for 3 h.The bulk density and the apparent porosity of the sample with 93SiO_(2) fume or 96SiO_(2) fume are equivalent,the hot modulus of rupture of the sample with 93SiO_(2) fume is the lowest,and the slag resistance of the sample with 96SiO_(2) fume is the best.The comprehensive performance of the sample with 96SiO_(2) fume is the best.
文摘采用静态坩埚法进行了Sialon增强Al2O3 SiC C铁沟浇注料的抗渣实验。结果表明,该种铁沟料具有比传统铁沟料更优异的抗渣性能。通过X 射线衍射和SEM分析可知,其抗渣机理为:添加的Si3N4,Si与Al2O3发生原位反应生成Sialon,使材料内部结合更加紧密,并且生成的Sialon活性较高,氧化放出气体,阻止熔渣的渗入;其次,Sialon向熔渣中溶解,使熔渣成为含N的高硅玻璃,粘度增大;此外,Al2O3与熔渣的MgO反应生成MgAl2O4,形成一阻挡层,这也是Sialon增强Al2O3 SiC C浇注料具有优异的抗渣渗透及侵蚀性能的重要原因。