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
Effects of B4C additions （0,0.2%,0.4%,and 0.6%） on cold physical properties and hot modulus of rupture of Al2O3-SiC-Si3N4 castables for iron trough were investigated. The phase composition and microstructure were an...Effects of B4C additions （0,0.2%,0.4%,and 0.6%） on cold physical properties and hot modulus of rupture of Al2O3-SiC-Si3N4 castables for iron trough were investigated. The phase composition and microstructure were analyzed by XRD and SEM. The results show that bulk density,cold strength,and hot modulus of rupture of the castables first increase and then decrease while apparent porosity first drops and then increases with B4C addition increasing. The optimum addition of B4C is 0.4%. B4C mainly contributes to sintering and antioxidation. Compared with the specimens without B4C,the specimens with B4C have more fibrous O＇-SiAlON with larger length-diameter ratio. The growth mechanism of O＇-SiAlON crystals is deduced to gas-solid mechanism.展开更多
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。
基金supported by the Natural Science Foundation of Hebei Province(No:E2009000784)Educational Department of Hebei Province (2008453)
文摘Effects of B4C additions （0,0.2%,0.4%,and 0.6%） on cold physical properties and hot modulus of rupture of Al2O3-SiC-Si3N4 castables for iron trough were investigated. The phase composition and microstructure were analyzed by XRD and SEM. The results show that bulk density,cold strength,and hot modulus of rupture of the castables first increase and then decrease while apparent porosity first drops and then increases with B4C addition increasing. The optimum addition of B4C is 0.4%. B4C mainly contributes to sintering and antioxidation. Compared with the specimens without B4C,the specimens with B4C have more fibrous O＇-SiAlON with larger length-diameter ratio. The growth mechanism of O＇-SiAlON crystals is deduced to gas-solid mechanism.
