Patent ID: 7829479
Filing Date: 2010-11-09
Classification: C04B,Y10T

Abstract:
1. A fiber-reinforced heat-resistant sound-absorbing material comprising: (a) a fiber preform made of silicon carbide short fibers having heat resistance of 1000° C. or greater; and (b) a heat resistant compound having heat resistance of 1000° C. or greater and applied onto the surface of the fibers, wherein the fiber-reinforced heat-resistant sound-absorbing material has a porosity of 95% or greater, wherein the silicon carbide fibers contain a metal element which is selected from the class consisting of Group II, III and IV metal atoms of the periodic table and in which a temperature at which a free energy change in the carbon reduction reaction of the oxide of the metal element becomes a negative value is higher than a temperature at which a free energy change in the carbon reduction reaction of silicon oxide becomes a negative value, and wherein the silicon carbide fibers have an oxygen content falling within a range of from 2 to 13 wt.%.