MgO-B_2O_3-SiO_2渣晶化动力学

CRYSTALLIZATION KINETICS OFMgOB_2O_3SiO_2 SLAG

应用差热分析（ＤＴＡ）技术研究了Ｃｒ２Ｏ３、Ｌａ２Ｏ３、ＣｅＯ２、Ｖ２Ｏ５、Ｓｉ３Ｎ４、ＳｉＣ、ＣａＦ２、ＭＯｘ对ＭｇＯＢ２Ｏ３ＳｉＯ２渣中含硼组分析晶活化能的影响。结果表明，Ｃｒ２Ｏ３、ＣｅＯ２、ＣａＦ２、ＳｉＣ、ＭＯｘ作为晶核剂加入后，可降低析晶活化能，有利于含硼组分以结晶相析出，是有效的晶核剂；Ｌａ２Ｏ３和Ｖ２Ｏ５对析晶活化能没有影响；Ｓｉ３Ｎ４则增强玻璃网络稳定性，提高析晶活化能。所以Ｌａ２Ｏ３、Ｖ２Ｏ５和Ｓｉ３Ｎ４作为晶核剂是无效的。

The crystallization kinetics of the boron component bearing MgOB_2O_3SiO_2 slag with Cr_2O_3, La_2O_3,CeO_2, V_2O_5, Si_3N_4, SiC, CaF_2, MO_x as nucleation agents were studied using differential thermal analysis(DTA). The results showed that Cr_2O_3, CeO_2, SiC, CaF_2, MO_x decrease the activation energy of crystallization, that make the crystalline phase precipitate easily.However,the activation energy of crystallization is increased by addition of Si_3N_4, the effect of La_2O_3 and V_2O_5 on the activation energy of crystallization is little.