초록 ▼

Discontinuous silicon carbide fiber reinforced ceramic composites are disclosed having high strength, fracture toughness, and oxidative stability, even in high temperature oxidative environments. Disclosed composites include silicon carbide fiber reinforced aluminosilicate, lithium aluminosilicate,

Discontinuous silicon carbide fiber reinforced ceramic composites are disclosed having high strength, fracture toughness, and oxidative stability, even in high temperature oxidative environments. Disclosed composites include silicon carbide fiber reinforced aluminosilicate, lithium aluminosilicate, barium aluminosilicate, magnesium aluminosilicate, and combinations thereof. Flexural strengths in excess of 20,000 psi (138 MPa) at temperatures in excess of 1000°C. are attainable with such composites. The composite is formed by starting with the ceramic matrix material in the glassy state and converting it from the glassy state to the ceramic state after densification of the composite.

대표청구항 ▼

A silicon carbide fiber reinforced ceramic composite consisting essentially of about 15% to about 50% by volume high strength and high modulus of elasticity discontinuous silicon carbide fibers laid up in substantially in-plane random orientation in a substantially titanium-free glass-ceramic matrix

A silicon carbide fiber reinforced ceramic composite consisting essentially of about 15% to about 50% by volume high strength and high modulus of elasticity discontinuous silicon carbide fibers laid up in substantially in-plane random orientation in a substantially titanium-free glass-ceramic matrix selected from the group consisting of lithium aluminosilicate, magnesium aluminosilicate, barium aluminosilicate, aluminosilicate, and combinations thereof, so as to produce strength and fracture toughness properties greater than that of the matrix at temperatures in excess of 800°C. in an oxidizing environment.