Co包覆纳米Al_2O_3/TiC复合材料的界面电子结构计算及材料制备  

Calculation of the Interface Valence Electron Structure Parameters and Fabrication of Cobalt-coated Al_2O_3/TiC Composites

作　　者：师瑞霞[1] 尹衍升 李嘉[1] 龚红宇[3] 

机构地区：[1]济南大学材料学院,济南250022 [2]中国海洋大学材料学院,青岛266003 [3]山东大学材料液态结构及其遗传性教育部重点实验室

出　　处：《人工晶体学报》2006年第2期388-394,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(No.50572034);济南大学博士启动基金(B0414)项目

摘　　要：采用热压烧结法制备了Co包覆纳米A l2O3/TiC复合材料。当热压烧结温度为1650℃时,复合材料的抗弯强度、断裂韧性和硬度分别为782MPa、7.81MPa.m1/2和HRA92.7。A l2O3和A l2O3/TiC的断口以沿晶断裂为主,Co包覆A l2O3/TiC复合材料的断口则为沿晶和穿晶混合断口。利用经验电子理论计算了Co、TiC与α-A l2O3三者的价电子结构及其部分晶面的电子密度,并对三相的晶体学取向进行了预测。Cobalt-coated Al2O3/TiC composites were fabricated by hot pressing sintering. The flexture strength, fracture toughness and hardness are 782MPa, 7.81MPa·m^1/2 and HRA92, 7 respeclively. The fracture modes of Al2O3 and Al2O3/TiC are intergranular and one of cobalt-coated Al2O3/TiC composites is intergranular and transgranular. Valence electron structure parameters and crystal plane electron density of Co, TiC and α-Al2O3 were calculated by the empirical electron theory of solids and molecules （EET） on the basis of above work. The potential crystal plane orientations among the three phases were forecasted.

关 键 词：界面 Co包覆 Al2O3/TiC复合材料 电子密度 增韧 

分 类 号：O473[理学—半导体物理]