PURPOSE: To reduce unevenness of a composite material in reinforcing inorganic fibers of silicon nitride, to control a volume ratio and to eliminate anisotropy of strength by a simple method.
CONSTITUTION: Inorganic fibers for reinforcing composite material wherein short fibers, whiskers or powder is stuck to continuous inorganic ceramics fibers comprise silicon and nitrogen as essential components and at least one selected from oxygen, carbon and metals (one or more are selected from a metal element group of the group IIa and the group III to group V of the periodic table and the metal elements include boron and phosphorus) as an arbitrary component and have atomic ratios of each element of 0.04-3.0N/S, ≤15 O/Si, ≤17 C/S and ≤9 M/Si (M is the above metal element).
FUNAYAMA TORU
TASHIRO YUJI
TAKATSU RIKA
ISODA TAKESHI
