摘要
采用高温熔融冷淬法制备了Al2O3-SiO2-P2O5(ASP)系统玻璃,用原位晶化法获得了磷酸盐微晶玻璃;用IR、DSC、XRD、SEM等测试方法表征了玻璃结构及析晶性能,讨论了稀土Y2O3掺杂对ASP玻璃结构和析晶性能的影响。结果表明:Y2O3处于ASP的玻璃结构空隙中,起网络修饰体的作用,并未改变玻璃的基本结构,但Y3+离子会加强玻璃中P-O-键的伸缩振动。当Y2O3的掺杂量少于1.5wt%时,随着Y2O3含量的增加,玻璃的稳定性增强,析晶活化能升高;引入量为1.5wt%时,玻璃的稳定性最好,析晶活化能最大,玻璃不易析晶;掺杂量多于1.5wt%时,稳定性开始下降,析晶活化能降低。少量Y2O3掺杂并未改变玻璃析出的晶相种类,析出的主晶相仍为AlPO4,次晶相为Mg3(PO4)2,但玻璃中加入适量的Y2O3会减少次晶相Mg3(PO4)2的析出量。
Al2O3-SiO2-P2O5 glasses were prepared by melting-quenching method and then reheated for in-situ crystallization. Structure and crystallizing behavior of the glasses were analysized by IR, DSC, XRD and SEM. Effects of Y2O3 doped on the structure and crystallization of the glasses were discussed. Results indicate that, Y2O3 act as network modifier, in the interspace of glass structure, does not change the basic glass structure, but when the Y^3＋ ion come into the glass structure the P-O^- bond stretching strengthen. With the addition of Y2O3, the stability of the glass enhances and the activation energy E for crystallization increases when Y2O3 content is less than 1.5wt%. The stability of the sample is the best and E is the largest at 1.5wt% Y2O3 doped, then both decrease when Y2O3 content is over 1 .Swt%. The crystal phases in Al2O3-SiO2-P2O5 glass-ceramics keep the same after Y2O3 doped, The primary crystal phase is AlPO4 and the subordinate is Mg3（PO4）2, but the content of Mg3（PO4）2 decreases with the addition of Y2O3.
出处
《中国陶瓷》
CAS
CSCD
北大核心
2008年第6期19-22,共4页
China Ceramics
