影响Li_2O-PbO-ZnO系统釉料虹彩现象因素的研究

A STUDY ON INFLUENCE FACTORS OF IRIDESCENT PHENOMENON OF GLAZE IN Li_2O-PbO-ZnO SYSTEM

本文对添加V_2O_5和TiO_2的锂-铅-锌系统基础釉组成中PbO/ZnO=1.2—4.42,SiO_2/Al_2O_3=15—11.36的一系列生料虹彩釉所出现的虹彩现象进行了研究。探讨了不同温度下釉的析晶和虹彩现象的关系。研究表明:作为主晶相析出的金红石晶体(110)面和(220)面发达,金红石晶体沿一维方向整齐排列,平行于釉面;金红石晶体之间填充有少量由Si、Pb、Zn、Ti组成的玻璃体,V分布于整个玻璃相中,TiO_2小部分溶解在玻璃相内;金红石晶体明显富集于釉表面并形成薄膜,薄膜很薄(<1μm),对光线产生干涉现象,造成了虹彩效应。实验结果证实了V离子在构成虹彩薄膜的金红石晶体中不固溶。采用X射线衍射、扫描电镜、电子衍射及能谱分析等方法对虹彩薄膜中的晶体形貌及成分进行了测定。

In this paper, the iridescent phenomenon of glaze In Li_2O-PbO-ZnO system (PbO/ZnO=1.2—4.42, SiO_2/Al_2O_2=15-11.36)with V_2O_6 and TiO_2 is studied, Relationship between tridescent phenomenon and precipitated crystals for different temperatures is also discussed.The results indicate that the rutile crystals are precipitated as main crystal phase in the glaze. (110) and (220) faces of rutile crystal have greater growth rate along the onedimensional direction aligned in good order and parallel to the surface of the glaze. Intervals of the rutile crystals are filled with a small amount of glasses which are composed of Si, Pb, Zn and Ti. Vanadium distributes in all glass phases.TiO_2 (rutile) crystals enrich near the glaze surface obviously, only a small amount solves in glass, and forms a very thin film(<1μm) which causes the iridescent phenomenon.The experimentai results confirm that V^(5+) ion does not form solid solution with rutile crystals which form the iridescent film. The shape and composition of crystals in the Aridescent film are examined by OM, SEM, XRD, ED and EDAX.