Prevention of Carbon Fiber/Carbon Composite Oxidation by Frit Type Antioxidant

Abstract

Frit type antioxidants, whose major components were boron dioxide and boron dioxide plus silicon carbide, were coated on a fine grained graphite and two types of C/C composite as substrates. Oxidation weight loss of the substrates was measured. The antioxidants contacted well with the substrates after treated up to 1000°C and more. The boron dioxide type antioxidants protected oxidation effectively up to 1000°C, but not so effectively more than 1000°C. The boron dioxide added silicon carbide type antioxidant, however, was effective up to 1400°C.