초록 ▼

A method for manufacturing a discontinuous fiber reinforced glass matrix composites by injection molding using an injection nozzle that separates substantially all of a multifilament yarn into individual fibers resulting in a composite having greater crack resistance. The method comprises impregnati

A method for manufacturing a discontinuous fiber reinforced glass matrix composites by injection molding using an injection nozzle that separates substantially all of a multifilament yarn into individual fibers resulting in a composite having greater crack resistance. The method comprises impregnating continuous filament yarn with glass matrix powders comprising glass, glass-ceramic powders or a mixture thereof. The impregnated multifilament yarn is chopped into discontinuous lengths and exposed to a temperature sufficient so that the matrix material softens. Pressure is applied to the heated impregnated multifilament yarn sufficient to displace the yarn into a mold through an injection nozzle contoured such that sufficient die-wall shear forces are generated to separate substantially all of the multifilament yarn into individual filaments. A mold pressure is maintained sufficient to prevent relaxation of the composite until the strain point of the glass is reached.

대표청구항 ▼

A method for manufacturing a discontinuous fiber reinforced glass matrix composite comprising: (a) impregnating continuous multifilament silicon carbide, alumina, silicon nitride or carbon fiber yarn with a slurry comprising glass, glass-ceramic powder or a mixture thereof and a carrier liquid, foll

A method for manufacturing a discontinuous fiber reinforced glass matrix composite comprising: (a) impregnating continuous multifilament silicon carbide, alumina, silicon nitride or carbon fiber yarn with a slurry comprising glass, glass-ceramic powder or a mixture thereof and a carrier liquid, followed by drying to remove the carrier liquid; (b) chopping said impregnated multifilament yarn into discontinuous lengths; (c) exposing said chopped impregnated multifilament yarn to a temperature sufficient so that said matrix softens; (d) applying a pressure to said heated chopped impregnated multifilament yarn sufficient to displace said heated chopped impregnated multifilament yarn into a mold through an injection nozzle contoured such that sufficient die-wall shear forces are generated to separate substantially all of said multifilament yarn into individual filaments; (e) said injection nozzle having a diameter less than the length of said yarn and said injection nozzle having a length greater than said length of said yarn; and (f) maintaining a mold pressure sufficient to prevent relaxation of the composite until the strain point of the glass is reached; resulting in a composite having greater crack resistance.