添加TiO2和Cr2O3对镍渣微晶玻璃析晶的影响

Effect of TiO_2 and Cr_2O_3 Addition on Crystallization of Nickel Slag Glass-Ceramics

利用X射线衍射、扫描电镜(SEM)和能谱分析研究添加TiO2和Cr2O3对镍渣微晶玻璃析晶的影响。结果表明,添加复合晶核剂TiO2+Cr2O3的镍渣微晶玻璃热处理后产生分相析晶,产生富钙相和富硅相。添加复合晶核剂TiO2+Cr2O3的镍渣微晶玻璃经过热处理后首先析出的晶相是尖晶石型晶体Mg2TiO4,并且有Ca(Mg,Al,Ti)(Si,Al)2O6普通辉石的晶体衍射峰出现。TiO2在镍渣微晶玻璃的晶化过程中不是直接形成晶核,而是促进了尖晶石型Mg2TiO4晶核的形成,从而有利于晶体生长。

The effect of TiO2 and Cr2O3 addition on crystallization of nickel slag glass-ceramics is studied by XRD,SEM and EDS methods.The result indicates that,when composite nucleating agent TiO2 ＋ Cr2O3 is added,nickel slag glass-ceramics will,after heat treatment,produce phase crystallization to form calcium-rich phase and silicon-rich phase,where spinel type crystal Mg2TiO4 is the first to precipitate,and the diffraction peak of common pyroxene crystal Ca（Mg,Al,Ti）2O6 also occurs.TiO2 does not directly form crystal nucleus but promotes the formation of the spinel type crystal Mg2TiO4,facilitating the crystal growth.