Chapter 36. Fabrication and Mechanical Properties of Si-M-C-(O) Tyranno Fibers

Summary

A new SiC-based continuous fiber containing a small amount of sol-gel-derived Zircon (5–20%) has been developed. This new inorganic continuous fiber, called Tyranno ZX, has a better oxidation resistance in dry and wet air at high temperatures than those of the current SiC-based continuous fibers. The precursor polymer of Tyranno ZX, was prepared by polymerizing the precursor polymer of Tyranno ZM and the additives of the sol-gel-derived Zircon alcoholic solution. The production process of Tyranno ZX from its precursor polymer was almost the same as that of current Tyranno Fiber (ZMI). Although the plloductivity is open to improvement, fiber diameter, tensile strength and tensile modulus of Tyranno ZX were 11microns, 3.0 GPa and 180–195 GPa, respectively. The oxidation resistance of Tyranno ZX at 1000 — 1500°C in wet air was excellent in comparison to the current polymerderived SiC based fiber (Tyranno ZMI, Hi-Nicalon). Finally, Tyranno ZX is slightly less resistant to bend stress relaxation than ZMI and Hi-Nicalon fibers.