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首页> 外文期刊>Metallurgical and Materials Transactions B >Reactions between MgAlON-BN Composites and CaO-SiO2-Al2O3-MgO-“FeO” Slag
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Reactions between MgAlON-BN Composites and CaO-SiO2-Al2O3-MgO-“FeO” Slag

机译：MgAlON-BN复合材料与CaO-SiO2 -Al2 O3 -MgO-“ FeO”渣的反应

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摘要

The reactions between MgAlON and MgAlON-BN composites and synthetic CaO-SiO2-Al2O3-MgO-“FeO” slag at different temperatures were investigated under stagnant condition using the ‘‘finger’’ experiment as well as X-ray sessile drop methods. The corrosion rate was denoted by the radius difference between the initial radius of the specimen rod and the unreacted core at definite time intervals. The experimental results showed that the radius difference is linear with the square root of time. This indicated that the diffusion of ions in the slag through the product layer is the rate-determining step. One product layer was observed between the unreacted core and slag. X-ray images showed that gas bubbles were generated during the slag penetration. The slag penetration process depends strongly on the temperature. The apparent activation energy was evaluated to be 376.4 kJ/mol. The FeO addition into slag increased the slag corrosion rate. This is most probably due to the decrease of the slag viscosity, because the Fe+2 generally behaves as a network breaker. Furthermore, MgAlON and boron nitride (BN) can be oxidized by FeO, which also increased the slag corrosion rate. The slag corrosion rate decreased with increasing BN content. This can be explained by the fact that the grain boundary interfacial energy decreases with the increase of BN content and nonwetting of BN by molten slag compared to pure MgAlON.
机译：利用“手指”研究了在停滞条件下，MgAlON和MgAlON-BN复合材料与合成CaO-SiO2 -Al2 O3 -MgO-“ FeO”渣在不同温度下的反应。实验以及X射线无滴法。腐蚀速率由标本杆的初始半径和未反应芯在一定时间间隔内的半径差表示。实验结果表明，半径差与时间的平方根成线性关系。这表明离子在炉渣中通过产品层的扩散是决定速率的步骤。在未反应的芯和炉渣之间观察到一层产物。 X射线图像显示在炉渣渗透过程中产生了气泡。炉渣渗透过程很大程度上取决于温度。表观活化能经评估为376.4 kJ / mol。炉渣中FeO的添加提高了炉渣的腐蚀速度。这很可能是由于炉渣粘度降低所致，因为Fe + 2 通常起着网状破碎剂的作用。此外，MgAlON和氮化硼（BN）可以被FeO氧化，这也提高了炉渣的腐蚀速度。渣的腐蚀速率随BN含量的增加而降低。这可以通过以下事实解释：与纯MgAlON相比，晶界界面能随BN含量的增加和熔融炉渣对BN的不润湿而降低。

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  • 来源
    《Metallurgical and Materials Transactions B》 |2007年第2期|231-241|共11页
  • 作者

    Z.T. Zhang; T. Matsushita; W.C. Li; S. Seetharaman;

  • 作者单位

    Department of Materials Science and Engineering Royal Institute of Technology SE-10044 Stockholm Sweden;

    Department of Materials Science and Engineering Royal Institute of Technology SE-10044 Stockholm Sweden;

    Department of Physical Chemistry University of Science and Technology Beijing People’s Republic of China;

    Department of Materials Science and Engineering Royal Institute of Technology SE-10044 Stockholm Sweden;

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