Method of manufacturing fiber-reinforced composites having a gra

Details Method of manufacturing fiber-reinforced composites having a gra Method of manufacturing fiber-reinforced composites having a gra

1992-06-10

1994-10-11

Withers, James D.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 628, 156245, 264 58, 264 60, 264113, 264258, 4272481, 427249, C03B 2900, C04B 3334, F27B 914, C23C 1600

Patent

active

053543980

ABSTRACT:
Fiber-reinforced composites having a gradient function and made according to the present method have an excellent mechanical strength characteristic, good oxidation-resistance and good fracture toughness even at high temperatures not lower than 1500.degree. C. The fiber-reinforced composite made according to the present invention includes: a base formed of carbon-fiber reinforced composite sheets having a good mechanical strength characteristic and good fracture toughness and laminated together; and a surface portion laminated to and covering the base and formed of ceramic-fiber reinforced composites having good oxidation-resistance. The carbon content percentage of the base decreases almost successively from a central portion of the base to an interface portion of the base at the surface portion. This results in the fiber-reinforced composite which has good oxidation-resistance, a good mechanical strength characteristic and good fracture toughness even at high temperatures not lower than 1500.degree. C. and in which an abrupt change in respective thermal expansion coefficients of the base and the surface portion at the interface therebetween is reduced by its gradient composition.

REFERENCES:
patent: 4391873 (1983-07-01), Brassell et al.
patent: 4909872 (1990-03-01), Jarmon
patent: 4992318 (1991-02-01), Gadkaree
patent: 5108678 (1992-04-01), Hirasaka et al.
patent: 5221645 (1993-06-01), Drouot et al.

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