Effect of irradiation on the microstructure of Nicalon fibers
Effect of irradiation on the microstructure of Nicalon fibers
复制标题
辐照对尼卡龙纤维微观结构的影响
DOI：
10.1016/0022-3115(96)00387-x
复制
发表时间：
1996
影响因子：
3.1
通讯作者：
R. Jones
中科院分区：
文献类型：
--
作者：
A. Hasegawa;G. Youngblood;R. Jones
在标称 1040°C 的中子辐照至相对较高剂量 (43 dpa) 后，通过 TEM 对两种类型的 Nicalon 纤维（CG 和 Hi）进行微观结构分析。为了进行比较，还对未经辐照的纤维进行了微观结构分析，这些纤维在 1010°C 下热退火，退火时间相当于辐照暴露时间。对于任一类型的未辐照但热退火的尼卡龙纤维，均未观察到晶粒生长。然而，观察到在辐照的 Nicalon-CG 纤维中发生了显着的晶粒生长，这可能是辐照引起的。相反，在经过辐照的 Hi-Nicalon 纤维中没有观察到明显的晶粒生长。在任一光纤中均未观察到空隙和其他辐照缺陷结构。对于这种极端的辐照条件（1040°C 下 43 dpa），Hi-Nicalon 纤维表现出比 Nicalon-CG 纤维高得多的微观结构稳定性。用 Hi-Nicalon 制成的复合 SiC/SiC 有望表现出改进的辐照性能。
Microstructural analyses were performed by TEM on two types of Nicalon fibers (CG and Hi) after neutron irradiation at nominally 1040°C to a relatively high dose (43 dpa). For comparison, microstructural analyses also were performed on unirradiated fibers that were thermally annealed at 1010°C for a time equivalent to the irradiation exposure time. No grain growth was observed for either type of unirradiated, but thermally annealed Nicalon fibers. However, significant grain growth was observed to have taken place in the irradiated Nicalon-CG fiber, presumably irradiation induced. In contrast, no significant amount of grain growth was observed in the irradiated Hi-Nicalon fibers. Void and other irradiation defect structures were not observed in either fiber. For such extreme irradiation conditions (43 dpa at 1040°C), the Hi-Nicalon fiber exhibits a much higher degree of microstructural stability than Nicalon-CG fiber. Composite SiC/SiC made with Hi-Nicalon promises to also exhibit improved irradiation performance.