刘新红
,
钟香崇
耐火材料
doi:10.3969/j.issn.1001-1935.2013.01.002
以板状刚玉、α-Al2O3微粉、石墨、Al粉、Si粉为原料,固定板状刚玉、α-Al2 O3微粉、石墨的加入质量分数分别为85％、5％、2％,加入8％(w)不同比例的Al粉和Si粉(Al、Si质量比分别为0∶8、5∶3、3∶5和8∶0),以酚醛树脂为结合剂,制备了低碳Al2O3-C滑板,并研究了该滑板材料于1 500℃保温3h埋石墨热处理后的热态抗折强度、应力-应变关系和抗热震性,同时分析了其物相组成和显微结构.结果表明,此低碳Al2O3-C滑板材料具有较高的高温强度和优良的抗热震性:当Al、Si质量比从0∶8变为8∶0时,材料在1 400℃的高温抗折强度从10.4 MPa增至32.4 MPa;在6.5 MPa载荷下1 400℃时的最大变形量从215 μm降至90 μm;1 100℃(≒)风冷热震3次后的抗折强度保持率从80％降至65％.这是由于Al、Si在使用的高温下与C、CO和N2反应生成了非氧化物Al4C3、AlN和SiC,这些非氧化物填充在刚玉骨架结构中起增强、增韧作用,有利于提高低碳Al2O3-C滑板材料的高温力学性能.
关键词:
低碳Al2O3-C滑板
,
高温力学性能
,
Al粉
,
Si粉
,
氧化物-非氧化物复合材料
钟香崇
耐火材料
doi:10.3969/j.issn.1001-1935.2008.01.001
综述了我们实验室与企业合作研究开发的冶金工业用氧化物-非氧化物复合高效耐火材料的一些进展:(1)用高温还原-氮化法研制了高炉用矾土基β-SiAlON结合刚玉复合材料,在配方基质中用矾土取代刚玉;(2)用矾土基β-SiAlON取代Al2O3-C砖中部分或全部石墨,开发了低碳Al2O3-SiAlON滑板材料,已成功用于生产高质量钢连铸;(3)研究开发了金属Al-Si复合Al2O3-C滑板材料,它具有较高的高温强度和优良的抗热震性,其特点是低碳含量、低温烧成和在高温使用时原位生成碳化物和氮化物,已成功用于优质钢连铸的钢包和中间包.
关键词:
研究开发
,
氧化物-非氧化物复合材料
,
冶金
Beiyue Ma Qiang Zhu Yong Sun Jingkun Yu Ying Li
材料科学技术（英文）
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
