Defect control of SiC polycrystalline fiber synthesized from poly-aluminocarbosilane
Defect control of SiC polycrystalline fiber synthesized from poly-aluminocarbosilane
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DOI：
10.1016/j.jeurceramsoc.2016.02.022
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发表时间：
2016-11-01
影响因子：
5.7
通讯作者：
Oda, Hiroshi
中科院分区：
文献类型：
--
作者：
Ishikawa, Toshihiro;Oda, Hiroshi
SiC-多晶纤维（Tyranno SA）显示出高达2000摄氏度的优异耐热性。为了扩大未来的应用，迫切需要提高纤维的机械强度。Tyranno SA是通过大量的热处理程序生产的。这种生产过程非常类似于碳纤维在惰性气体气氛中高温下的分解和致密化过程。由于这些生产过程伴随着气体副产物，很容易在每根长丝中留下孔隙沿着其他一些缺陷。这些孔隙也将成为“缺陷”，以及残留的碳和异常晶体生长成为显著的缺陷。在本研究中，首先，获得了SiC多晶纤维的缺陷尺寸与抗拉强度之间的关系。从该结果可知，缺陷尺寸越小，强度越高。通过工艺控制，获得了表面较光滑的SiC多晶纤维。(C)2016爱思唯尔有限公司版权所有。
SiC-polycrystalline fiber (Tyranno SA) shows excellent heat-resistance up to 2000 degrees C. Aiming to enlargement of the future application, increase in the mechanical strength of the fiber is eagerly required. Tyranno SA was produced via lots of heat-treatment procedure. This production process is very similar to that of carbon fiber containing decomposition and densification processes at high temperatures in inert gas atmosphere. As these production processes are accompanied by the gaseous by-products, it's easy to remain pores in each filament along with some other defects. These pores would also become "defect" as well as both residual carbon and abnormal crystalline growth become remarkable defects. In this study, first, the relationship between the defect size and the tensile strength of SiC-polycrystalline fiber was obtained. From this result, it was clarified that the smaller the defect size became, the higher the strength became. By controlling the processes, smoother surface of SiC-polycrystalline fiber was obtained. (C) 2016 Elsevier Ltd. All rights reserved.