氧化铝晶片互锁结构材料及其形成机制研究

Inter-locked Alumina Structured Material and Its Forming Mechanism

采用叔丁醇基凝胶注模的方法,以AlF_3-SiO_2体系为基础,利用其高温气-固反应形成柱状氟黄玉石,通过控制Al/Si比、添加组分和热处理制度,促进氟黄玉石分解、Si组分挥发和氧化铝片晶形成,制备出在无液相出现的条件下,氧化铝晶片以镶嵌互锁形式结合的陶瓷材料。本文对生成氧化铝晶片互锁结构材料过程中的物相组成和组织形貌变化规律进行了分析研究,对晶片互锁界面的形成机理和结合形式进行了讨论,为高温弹性热密封材料的设计探索新技术途径。

On the basis of Al F_3-SiO_2 system, columnar fluorine rose aurora were formed through high temperature gas-solid reaction. By controlling the Al/Si ratio, adding composition and heat treatment system, the decomposition of fluorine rose aurora and evaporation rate of Si components were both promoted, and alumina platelets formed afterwads. In the absence of liquid phase appearance, a novel ceramic material with inter-locked corundum structure was prepared, using the TBA(tert butyl alcohol)-based gel-casting method. In this paper, the evolution process of phase composition and morphology organization was analyzed. Then, the forming mechanism and combination forms of the inter-locked corundum structure were discussed. This kind of structure will make a contribution to the exploration for a new approach of designing high temperature elastic sealing material.