Fiber bundles inorganic fibers , and composite materials for the inorganic fiber bundles composed of the fiber bundles for the inorganic fibers and ceramic matrix composite material reinforced with the fiber bundles .

摘要

PROBLEM TO BE SOLVED: To provide an inorganic fiber for fiber bundle which forms an interface layer on the whole surface of the fiber at an interface between matrix and the fiber and suppresses the decrease of fiber strength due to the damage of the fiber in the manufacturing process of an inorganic fiber bundle for composite material and avoids the contact between the fibers in the fiber bundle in the manufacturing process of a composite material in order to obtain a ceramic-based composite material having sufficient strength and destruction energy and showing excellent durability when it is subjected to the stress under high temperature and oxidative atmosphere.SOLUTION: An inorganic fiber for fiber bundle is an inorganic fiber for fiber bundle which composes an inorganic fiber bundle for composite material in which the diameter of the fiber varies in a longitudinal direction. Preferably, it is a silicon carbide-based fiber having a specific difference between a maximum diameter and a minimum diameter of 2 to 6 μm and having a pitch of variation of 10 to 200 mm.