金属和陶瓷界面的研究

Study of the Interface Between Metal And CeraMic

单晶体的金属(Nb)和陶瓷(α-Al_2O_3)根据一定的位向关系通过热压,将形成一个金属和陶瓷的界面。然后制备试样并置于分辩率为1.7A的高分辨率透射电子显微镜(HREM)下观察其界面结构。结果表明,界面二侧的原子配合良好。界面区的宽度约为4～6晶格距离。位于界面区的不同原子相交叉并出现台阶。同时,由于在界面区出现大量不同晶体凹凸啮合而形成内锁(Lock-in)状态,其界面强度提高。这个结果能够揭示由金属和陶瓷所构成的复合材料的结合机理和界面模式。同样也可以作为确定复合材料界面力学性能的基础。

Single crystale of metal (Nb) and ceramic (a-Al_2O_3) were bonded by using hot-press procedure according to their certain orientation. A metal (Nb)/ceramic (α-Al_2O_2) interface was formed. Then specimen was prepared for observing under High Resolution Electron Microscopy (HREM) with a demonstrated point resolution of 1.7A. The results show that the atomic lattice of two sides of materials at well bonded matched plenty well. The width of the interface is about 4-6 lattice distance. The differ- rent atoms locating in the interfacial region intersect each other and appear the steps. Thus, the maximum number of rows of atoms and valleys can form 'lock-in' configuration simultaneously. The interfacial strenth will be improved. The results show the bonding mechanism and the interfacial moder for the composite made up of metal and ceramic. The results can be the bases of determining the mechaincal propeties of the interface.