초록 ▼

A composite material comprises silicon carbide and a boride of at least one element of Groups IVa to VIa of the Periodic Table, at least a portion of the boride being in the form of fiber having an aspect ratio of 3 or above. The composite material has high toughness owing to the fibrous boride. The

A composite material comprises silicon carbide and a boride of at least one element of Groups IVa to VIa of the Periodic Table, at least a portion of the boride being in the form of fiber having an aspect ratio of 3 or above. The composite material has high toughness owing to the fibrous boride. The composite material is produced by molding a raw material mixture composed of silicon carbide, a substance containing at least one element of Groups IVa to VIa of the Periodic Table, at least a portion thereof being in the form of fiber having an aspect ratio of 3 or above, and a substance containing boron, and sintering the molded body.

대표청구항 ▼

A composite material of silicon carbide and boride of formula MxBy, wherein M denotes at least one element of Groups IVa to VIa of the Periodic Table and x and y are integers, dispersed in said silicon carbide, at least 10% of said boride being in fiber form having an aspect ratio of 3 or above, and

A composite material of silicon carbide and boride of formula MxBy, wherein M denotes at least one element of Groups IVa to VIa of the Periodic Table and x and y are integers, dispersed in said silicon carbide, at least 10% of said boride being in fiber form having an aspect ratio of 3 or above, and said composite material being produced by a process which comprises preparing a mixture of silicon carbide, a substance containing at least one element of Groups IVa to VIa of the Period Table except any boride thereof, at least 10% thereof (in terms of said at least one element) being in the form of fiber having an aspect ratio of 3 or above, and a substance containing boron except any boride of at least one element of Groups IVa to VIa of the Periodic Table at the following mixing ratio wherein the boride of at least one element of Groups IVa to VIa of the Periodic Table to be produced is MxBy: said silicon carbide=100 parts by weight; said substance containing at least one element of Groups IVa to VIa of the Periodic Table=1.64xㆍdBㆍMm/MB to 31.2xㆍdBㆍMm/MB [1.64xㆍdBㆍMm/MB to 31ㆍ2xㆍdbㆍMm/MB]parts by weight in terms of said at least one element, MB denotes the molecular weight of the boride, dB denotes the density of the boride, and Mm denotes the atomic weight of M; and said substance containing boron=more than the stoichiometrically required amount for the formation of a boride of at least one element of Groups IVa to VIa of the Periodic Table, molding the resulting mixture, and sintering the molding in a vacuum or a non-oxidizing atmosphere, thereby reacting said substance containing at least one element of Groups IVa to VIa of the Periodic Table and said substance containing boron to form said boride of at least one element of Groups IVa to VIa of the Periodic Table in which at least 10% of said boride is in fiber form having an aspect ratio of 3 or above.