| 摘要 |
PURPOSE:To increase the effect of addition of SiC whiskers by using SiC whiskers with scarce lamination defect in the crystal structure, having a specified aspect ratio and by composing it with ceramic material. CONSTITUTION:The silicon carbide whiskers having 2-100 aspect ratio and <=0.2h1/h2, where h1 and h2 are peak intensities of 2H type (100) and 3C type (200) of crystalline structure in curve of X-ray diffraction, respectively, are mixed and dispersed in the ceramic powder. After molding, the molded body is sintered to obtain fiber-reinforced composite sintered compact. In this case, the smaller peak intensity ratio h1/h2 results in more scarce lamination defect and the whiskers having >0.2 aspect ratio does not show the sufficient effect of addition of the whiskers. When the whiskers have <2 aspect ratio, they have a smaller effect of crack deflection and drawing in the composite body. On the other hand, when the aspect ratio is more than 100, the whiskers are difficulty dispersed in the matrix and that causes the lowering of strength of the composite body. |
