SiC-based ceramic fibers are derived from polycarbosilane or polymetallocarbosilane precursors and are classified into three groups according to their chemical composition, oxygen content, and C/Si atomic ratio. The first-generation fibers are Si-C-O (Nicalon) fibers and Si-Ti-C-O (Tyranno Lox M) fibers. Both fibers contain more than 10-wt% oxygen owing to oxidation during curing and lead to degradation in strength at temperatures exceeding 1,300°C. The maximum use temperature is 1,100°C. The second-generation fibers are SiC (Hi-Nicalon) fibers and Si-Zr-C-O (Tyranno ZMI) fibers. The oxygen content of these fibers is reduced to less than 1 wt% by electron beam irradiation curing in He. The thermal stability of these fibers is improved (they are stable up to 1,500°C), but their creep resistance is limited to a maximum of 1,150°C because their C/Si atomic ratio results in excess carbon. The third-generation fibers are stoichiometric SiC fibers, i.e., Hi-Nicalon Type S (hereafter Type S), Tyranno SA, and Syl...

中文翻译：

---

聚合物衍生陶瓷纤维

SiC 基陶瓷纤维来源于聚碳硅烷或多金属碳硅烷前驱体，根据其化学成分、氧含量和 C/Si 原子比分为三组。第一代纤维是Si-CO（Nicalon）纤维和Si-Ti-CO（Tyranno Lox M）纤维。由于固化过程中的氧化，两种纤维都含有超过 10 重量％的氧，并在超过 1,300°C 的温度下导致强度下降。最高使用温度为 1,100°C。第二代纤维是SiC（Hi-Nicalon）纤维和Si-Zr-CO（Tyranno ZMI）纤维。通过在 He 中进行电子束辐照固化，这些纤维的氧含量降低到小于 1 wt%。这些纤维的热稳定性得到改善（它们在高达 1,500°C 的温度下仍保持稳定），但它们的抗蠕变性限制为最大 1，150°C，因为它们的 C/Si 原子比导致碳过量。第三代纤维为化学计量碳化硅纤维，即Hi-Nicalon Type S（以下简称Type S）、Tyranno SA和Syl...