桃花片铜红釉的着色机理

COLOURING MECHANISM OF PEACH BLOOM COPPER RED GLAZE

研究了表征桃花片铜红釉的3个特征——红釉区、绿苔点和泛绿区的化学成份和显微结构。首次通过实验揭示了桃花片铜红釉的着色剂是小于2μm的细分散的金属铜粒子;初次给出了泛绿区和绿苔点的化学成份和它们的结构特征。阐明了泛绿区是由许多含有硫化铜的微粒所引起的,而肉眼所能分辨的绿苔点实际上是一个绿色环状小圈,是该处基质玻璃釉中局部富二价铜离子而形成的。讨论了桃花片铜红釉的特殊色泽和色带形成的主要原因。

Chemical composition and microstructure of red glaze region, green moss like fleck and red region suffused with green colour, which are three characteristics of peach bloom copper red glaze, have been studied. The experimental results reveal that the colouring agent of peach bloom is the fine dispersed copper particles, the size of which is less then two microns. Chemical compositions and structural characteristics of the green moss like fleck and the red region suffused with green colour are first presented. It has clarified that the red region suffused with green colour is caused by many small particles containing copper sulphide and that the green moss like fleck, whick can be identified by eye, in fact, is a small green spot with an exterior ring and is formed by the local Cu^(2+) ions rich in the base glaze. The chief factors of the formation of the special tone and colour regions in peach bloom copper red glaze are discussed.