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 a fiber bundle, that suppresses decrease in the strength of the fiber due to the damage of the fiber during manufacturing the inorganic fiber bundle for a composite material and avoids the contact among the fibers in the fiber bundle under manufacturing the composite material to permit to form an interfacial layer with matrix throughout the surface of the fiber, in order to provide a ceramic-based composite material exhibiting enough strength and destruction energy, and excellent durability when stress is received under a high-temperature and oxidative atmosphere.SOLUTION: The inorganic fiber for a fiber bundle according to the present invention is the inorganic fiber for a fiber bundle composing the inorganic fiber bundle for a composite material and the fiber winds in the longitudinal direction thereof and the diameter of the fiber changes along with the longitudinal direction. Preferably, the fiber has a specific winding pitch and winding width, and is a fiber based on silicon carbide having a specific difference between the maximum diameter and minimum diameter. the winding pitch is between 3 to 40 mm, the winding width is between 0.1 to 5 mm, the difference between the maximum diameter and the minimum diameter is between 2 to 6 μm and the change in the pitch is between 10 to 200 mm.