邓建新
,
艾兴
,
丁泽良
中国腐蚀与防护学报
采用热压烧结工艺制备了Al_2O_3/TiB_2/SiC_w陶瓷复合材料,研究了SiC晶须含量对其高温氧化行为的影响.用XRD、SEM、TEM/EDS分析了材料氧化后的相组成及显微结构,探讨了该材料的氧化机理。结果表明,不同SiC_w含量的Al_2O_3/TiB_2/SiC_w陶瓷材料在1400℃空气中氧化30h的氧化增重符合抛物线规律。随SiC晶须含量的增加,材料的氧化活化能降低。
关键词:
陶瓷材料
,
Oxidation resistance
,
SiC whisker
Beiyue Ma Qiang Zhu Yong Sun Jingkun Yu Ying Li
材料科学技术（英）
Al2O3-SiC composite was synthesized with pyrophyllite and natural graphite as raw materials by carbothermal reduction reaction under argon atmosphere. The effect of synthesis temperature on phase composition and microstructure was investigated. Low-carbon MgO-C refractories were prepared by using the synthesized Al2O3-SiC composite as additive. The effect of its addition on the slag penetration and corrosion resistance as well as oxidation resistance of the refractories was investigated, and the slag resistance and oxidation resistance mechanisms of the Al2O3-SiC composite were also discussed. The results show that the synthesis temperature has a great influence on preparation of Al2O3-SiC composite. The Al2O3-SiC composite can be synthesized at 1873-1973 K under argon atmosphere, with pyrophyllite and natural graphite as raw materials, and particle sizes of the composite synthesized at 1973 K are mainly distributed as 1-2 μm. The slag penetration and corrosion resistance of low-carbon MgO-C refractories can be remarkably improved by adding the synthesized Al2O3-SiC composite, and the oxidation resistance has an improvement to some extent. The increase of slag viscosity and the formation of MgAl2O4 can effectively inhibit the slag penetration and corrosion for the refractories.
关键词:
Oxide-nonoxide composite
,
碳热还原
,
渣渗透和侵蚀
,
抗氧化性
,
耐火材料
