β-SiC晶须的形貌和微观结构  

MORPHOLOGY AND MICROSTRUCTURE OF β-SIC WHISKER

作　　者：耿林[1] 吴昆[1] 刘庆[1] 姚忠凯[1] 

机构地区：[1]哈尔滨工业大学

出　　处：《硅酸盐学报》1991年第6期543-548,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金;国家"863"高技术基金

摘　　要：利用透射电子显微镜研究了β-SiC晶须的形貌和微观结构及其相互关系。结果表明,β-SiC晶须的横截面有三角形和六角形两种。研究发现三角形晶须是具有面心立方结构的单晶体,其横截面是(111)面,生长方向(晶须轴向)为[111]方向。侧面平行于{112}晶面族。在六角形晶须的电子衍射花样中发现同时存在面心立方和密排六方两种斑点,但高分辨电镜观察结果表明,在这种晶须中没有发现密排六方结构,其密排六方衍射斑点是晶须中高密度孪晶面所致。因此六角形晶须也是面心立方结构,其横截面,轴向和侧面的晶体取向与三角形晶须相同,所不同的是在六角形晶须中存在大量孪晶面与晶须轴向垂直的微孪晶。The morphology and microstructure of β-SiC whisker and their interrelationship were studied by means of TEM. The results show that there are two kinds of whiskers, the cross-section of which are hexagonal and trigonal in shape. It is found that the trigonal whisker is a single crystal which has fcc structure, of which the cross section is(111)plane, the grown direction (axis of whisker) is the [111] direction, and the side surfaces are parallel to [112] planes. It is found also that there are both FCC and HCP spots in the diffraction patterns of the hexagonal SiC whisker. HREM observation results showed that there is no hcp structure in this kind of whisker, and the hcp spots are resulted from the high density twin planes in the whisker. Therefore, the hexagonal whisker is also of fcc structure, and its cross section, axis and side surfaces are the same as those of the trigonal whisker. The difference between the two kinds of whisker is that, in the hexagonal whisker, there are lots of microtwins, of which the twin planes are parallel to the axis of the whisker.

关 键 词：碳化硅 晶须 晶体 微观结构 

分 类 号：O766[理学—晶体学]