摘要
将二茂铁加入到含金属Al的MgO-C材料基质中,经高温处理后,研究了二茂铁对基质物相组成和显微结构的影响。结果表明,从1300℃开始,基质中原位生成大量的富镁尖晶石纤维,纤维的数量、长度和直径随处理温度的升高而增大。推测尖晶石纤维是在二茂铁热解产生的纳米铁粒子催化作用下,通过气-液-固(VLS)机制和气-固(VS)机制形成。同时二茂铁还可能起到催化MgO的碳热还原反应和Al4C3的分解反应的作用,使材料基质在较低温度下开始产生Mg、Al气相,促进纤维的生长。二茂铁的加入还使低碳MgO-C材料产品的物理性能得到提高。
The effects of ferrocene on microstructure of MgO-C refractory matrix are investigated by scanning electron microscopy（SEM）/energy-dispersive spectroscopy（EDS） techniques. Results show that the in-situ magnesia-rich spinel fiber starts to form from 1300℃ in the matrix The amount, length and diameter of the spinel fibers increase with the firing temperature rising. The vapor-liquid-solid（VLS） and vapor-solid（VS） mechanism is proposed to be the dominant mechanism of spinel fiber formation by the catalytic effect of ferrocene. The catalytic effect of ferrocene also plays a vital role in improving high temperature decomposition of Al4C3 and carbothermal reduction of MgO. The properties of low-carbon MgO-C refractories are improved by adding ferrocene.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2009年第10期115-118,共4页
Materials Reports
基金
河南省杰出人才创新基金资助项目(0621001400)
