复合晶核剂对黄磷炉渣微晶玻璃析晶的影响

以黄磷炉渣为主要原料,通过添加不同种类的复合晶核剂,采用熔融法制备了黄磷炉渣微晶玻璃。借助化学热力学软件Fact Sage 6.4模拟计算晶相类型,借助Kissinger方程分析析晶能力,利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)进行验证。结果表明:相比添加单一晶核剂TiO_2,复合晶核剂TiO_2+Ca F_2或复合晶核剂TiO_2+P_2O_5均能够降低黄磷炉渣基础玻璃的析晶活化能E,促进其析晶,复合晶核剂TiO_2+Cr_2O_3能够提高黄磷炉渣基础玻璃的析晶活化能E,抑制其析晶;无论添加单一晶核剂TiO_2,还是添加复合晶核剂TiO_2+Ca F_2、复合晶核剂TiO_2+P2O5或复合晶核剂TiO_2+Cr_2O_3,黄磷炉渣微晶玻璃晶相类型相同,主晶相为硅灰石(Ca Si O3),副晶相为铝透辉石(Ca(Mg,Al)(Si,Al)_2O6_)和氟磷灰石(Ca_5(PO_4)3_F),这与化学热力学软件Fact Sage 6.4模拟计算结果基本一致。

Effect of Composite Nucleation Agents on Crystallization of Glass-Ceramics Produced by Yellow Phosphorus Furnace Slag

A series of glass-ceramics were prepared by melting method using yellow phosphorus furnace slag as the main raw material and adding different kinds of composite nucleation agents. The crystal phase composition was calculated by FactSage 6.4;the crystallization ability was analyzed by Kissinger equation;the results of simulation and calculation were proved by means of X-ray diffraction and scanning electron microscopy.The results show that compared with adding TiO2, the adding of composite nucleation agents TiO2+CaF2 or TiO2+P2O5 can reduce the crystallization activation energy and promote the crystallization behavior.In the case of adding TiO2+Cr2O3, the effect is opposite.The major crystal phase is wollastonite and the minor crystal phases are aluminian diopside and fluorapatite when any one of TiO2, TiO2+CaF2, TiO2+P2O5 and TiO2+Cr2O3 are added as nucleating agent, which are consistent with the FactSage 6.4 calculation results.