Microstructural characterization of commercial hot-pressed boron carbide ceramics
Microstructural characterization of commercial hot-pressed boron carbide ceramics
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DOI：
10.1111/j.1551-2916.2005.00346.x
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发表时间：
2005-07-01
影响因子：
3.9
通讯作者：
Hemker, KJ
中科院分区：
文献类型：
--
作者：
Chen, MW;McCauley, JW;Hemker, KJ
用透射电镜对两种工业热压碳化硼陶瓷进行了研究。原子尺度的观察表明，这两种材料的晶界是免费的晶界膜。发现了两个三重结相，其特征在于是菱方晶系的Fe 2B 103和正交晶系的Ti 3B 4。此外，晶内析出物，AlN，Mo-2（C，B）和石墨，被确定，并发现具有相干的关系与碳化硼基体。还观察到了鳞片状夹杂物，其中大部分被确定为石墨。讨论了第二相的形成机理及其对力学性能的影响。
Two commercial hot-pressed boron carbide ceramics were investigated by transmission electron microscopy. Atomic-scale observations suggest that the grain boundaries of the two materials are free of grain-boundary films. Two triple-junction phases were found and characterized to be rhombohedral Fe2B103 and orthorhombic Ti3B4. In addition, intra-granular precipitates, AIN, Mo-2(C, B) and graphite, were identified and found to have coherent relationships with the boron carbide matrix. Micron-scale inclusions were also observed and most of them were determined to be graphite. The formation mechanisms of the secondary phases and their possible influence on mechanical properties are also discussed.