Effect of ZrO sub(2) Additive on the Properties of MgO-Cr sub(2) O sub(3) Refractory Used for RH Degasser

To improve the properties and RH degasser slag corrosion resistance of magnesia-chrome refractory, the effect of the addition of ZrO sub(2) was investigated. The results showed that the presence ZrO sub(2) additive can densify the magnesia-chrome samples due to promotion of grain boundary activities...

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Bibliographic Details
Published in:Key Engineering Materials 2016-02, Vol.680, p.331-334
Main Authors: Peng, Chao, Yang, Wei Bo
Format: Article
Language:English
Subjects:
Additives
Bonding
Corrosion resistance
Degassers
Densification
Magnesite refractories
Slags
Zirconium dioxide
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Summary:To improve the properties and RH degasser slag corrosion resistance of magnesia-chrome refractory, the effect of the addition of ZrO sub(2) was investigated. The results showed that the presence ZrO sub(2) additive can densify the magnesia-chrome samples due to promotion of grain boundary activities and ultimately direct bond formation, which improved the high temperature mechanical properties and corrosion resistance. The results also indicated that in the RH degasser slag system with a high ratio of calcia to silica, the slag resistance behavior of magnesia-chrome composite added ZrO sub(2) could be described as follows: the ZrO sub(2) reacts with CaO to form the calcium zirconate compound which is densification lay and simultaneously, could increase corrosion resistance performance by blinding pore and thickening slag viscosity. Therefore, it is expected to be the major reason for the ZrO sub(2) enhanced corrosion resistance behavior observed for magnesia-chrome refractory.
ISSN:1013-9826
1662-9795
DOI:10.4028/www.scientific.net/KEM.680.331