Effect of Y2O3 addition on CMS in CaO-MgO-SiO2 system.

In order to improve the high temperature performance of magnesia refractories, the effects of the Y₂O₃ addition on the formation and the transformation of (monticellite CMS) in CaO-MgO-SiO₂ system were researched using analytically pure chemical reagents MgO,CaO,SiO₂ and Y₂O₃ as main raw materials, and the refractoriness of the forming product Ca₄Y₆O(SiO₄)₆ was studied. The results show that: (1) the addition of Y₂O₃ can not only significantly reduce the production of low melting point phase CMS in the MgO-CaO-SiO₂ system, but also capture CaO and SiO₂ to convert CMS into high-melting point phases Ca₄Y₆O(SiO₄)₆, MgO and Y₂Si₂O₇, which is beneficial to improving the high temperature performance of magnesia materials; (2) and the refractoriness of Ca₄Y₆O(SiO₄)₆ is higher than 1 800 °C. [ABSTRACT FROM AUTHOR]