摘要
本文以蜡石和天然石墨为原料,通过碳热还原法合成了SiC-Al2O3复合粉体,考察了加热温度对SiC-Al2O3复合粉体合成的影响;并将SiC-Al2O3粉体作为添加剂加入到低碳镁碳砖中,考察了其对低碳镁碳砖抗氧化性和抗渣侵蚀和抗渣渗透性能的影响,并对其作用机理进行了探讨.研究结果表明,加热温度对于SiC-Al2O3复合粉体的合成具有重要的影响;通过在蜡石中添加适量的天然石墨,并将蜡石和石墨的混合物在惰性气氛下加热到1 650℃时,可以很容易地合成SiC-Al2O3复合粉体.在低碳镁碳砖中添加SiC-Al2O3复合粉末能明显提高其对氧化性炉渣的抗侵蚀和渗透性能,而对其抗氧化性能的影响不大.这是由于与炉渣接触时,SiC-Al2O3复合粉体易于进入渣中,使接触界面的炉渣部分的炉渣黏度大幅度增加,阻碍了炉渣向耐火材料的进一步侵蚀和渗透.
By using pyrophyllite and natural graphite as raw materials, SiC-Al2O3 composite was synthesized with carbotbermal reduction method. The effect of heating temperature on the synthesis was investigated. The effect of SiC- Al2O3 composite, which was added into low- carbon MgO- C refractory as additive, on the resistance to slag penetration and corrosion and the oxidation resistance of the MgO - C refractory was investigated, and its mechanism was studied as well. The results show that the heating temperature has a great influence on the synthesis of SiC-Al2O3 composite, and the composite could be easily synthesized with proper addition of natural graphite into pyrophyllite and heating the mixture to 1 650℃ in argon atmosphere. The resistance to slag penetration and corrosion of low - carbon MgO- C refractory was obviously improved by adding SiC-Al2O3 composite, while the oxidation resistance had little improvement. SiC-Al2O3 composite dissolved into the slag through the refractory - slag interface easily and made the viscosity of the slag near the interface rise. In consequence, the slag penetration and corrosion were inhibited effectively.
出处
《材料与冶金学报》
CAS
2008年第2期118-121,共4页
Journal of Materials and Metallurgy
