一维或二维结合相对含碳耐火材料强度和韧性的影响

发布时间：2018-03-26 01:46

  本文选题：含碳耐火材料　切入点：结合相　出处：《耐火材料》2017年03期

【摘要】：含碳耐火材料在高温下会发生酚醛树脂结合剂炭化和氧化物的还原反应,从而生成含碳气相或亚稳态氧化物气相,通过高温原位催化技术,可有效实现这些气相成分沉积生长,促进一维或二维结合相的原位生成,从而显著改善含碳耐火材料特别是低碳材料的强度和韧性。研究发现:1)酚醛树脂在高温下可形成碳纳米管结构,其氧化峰值温度可从506℃提高到664.6℃;2)MgO-C耐火材料中可原位形成一维MgO晶须或MgAl_2O_4晶须,其常温抗折强度、常温耐压强度、断裂位移量和经1100℃■水冷热震循环2次后残余耐压强度分别提高66%、47%、13%和26%;3)Al_2O_3-C耐火材料中可原位形成二维片状β-SiAlON阵列结构,而二维阵列结合相的生成,可将材料强度提高60%以上,1100℃■水冷热震循环2次后残余耐压强度仅降低4.5MPa。可见,含碳耐火材料中一维或二维结合相的高温原位生成,可显著改善含碳耐火材料的综合物理性能,是耐火材料低碳化增强和增韧的发展方向。
[Abstract]:Carbonization of phenolic resin binders and reduction of oxides will take place in carbon-containing refractories at high temperature, thus forming carbon-containing gas phase or metastable oxide gas phase, which can be effectively deposited and grown by high-temperature in-situ catalytic technology. The in-situ formation of one-dimensional or two-dimensional bonding phase was promoted, which significantly improved the strength and toughness of carbon-containing refractories, especially low carbon materials. It was found that the phenolic resin can form carbon nanotube structure at high temperature. The oxidation peak temperature can be raised from 506 鈩，

本文编号：1665790