微通道板热加工过程中芯皮玻璃界面的成分扩散

Compositional Diffusion of Core and Clad Glass Interface During Thermal Process of Micro-Channel Plate

通过扫描电子显微镜、质量能谱仪和原子力显微镜测试了微通道板单丝、复丝及坯板中芯皮玻璃界面的成分和结构彤貌，并分析了其变化趋势。采用压片法模拟了不同热加工条件下芯皮玻璃界面的状态，测试并分析了工艺参数变化对界面成分扩散能力和表面形貌的影响。结果表明：微通道板芯皮玻璃界面的Si4＋、Bi3＋、Pb2＋、Ba2＋、La3＋离子的界面扩散能力强，O2-、K＋离子在界面处的扩散能力弱。界面处的离子进行芯皮玻璃间的相互扩散，其中Bi3＋的扩散甚至可渗透微孔间最薄处的皮玻璃层，而扩散能力的差异致使微孔表面玻璃成分呈现不均匀分布。界面的扩散能力受到温度和压力的影响，并随温度的提高和压力的增加而增强。微通道板微孔内壁表面的粗糙度随芯皮玻璃界面的扩散增强而增大，酸蚀剥离芯玻璃后的皮玻璃表面出现岛状结构，这种岛状颗粒在光纤拉制时就已经在界面处形成，表明芯皮玻璃界面的扩散存在相互反应扩散。

The microstructure and composition of the interface of the micro-channel plate mono-fiber, multi-fiber and core-clad glass were determined by scanning electron microscopy, energy dispersive spectrometry and atomic force microscopy, respectively, and their changing behaviors were analyzed. The interface state of the core-clad glass under different thermal fusion conditions was simulated by a pressed disc method, and the interfacial diffusion ability and surface morphology were analyzed at different process parameters. The results show that the interface diffusion ability of Si4＋, Bi3＋, Pb2＋, Ba2＋ and La3＋ ions on the interface of micro-channel plate clad-core glass is intense, and the diffusion ability of O2- and K＋ ions at the interface is weak. The ion Bis＋ diffusion at the interface penetrates the thickness of the glass layer at the thinnest point between the micro-pores, and the glass composition of the micro-porous surface is unevenly distributed due to the different interfacial diffusion. The diffusion capacity of the interface is dependent upon temperature and pressure, and increases with increasing temperature and pressure. Also, the roughness of the wall surface of micro-channel plate increases with the increase of the diffusion ability. The island structure appears on the surface of clad glass after the core glass is etched. The island particles appear diffusion in the interface between core glass and clad glass. at the interface during fiber drawing, indicating the reaction