| abstract |
PROBLEM TO BE SOLVED: To provide a fiber-reinforced heat-resistant sound-absorbing material that has a broadband sound-absorbing performance that is not damaged for a long time even when exposed to a high-temperature and high-speed exhaust gas such as a jet engine, and is light in weight, and is lightweight for reducing jet noise. A manufacturing method thereof is provided. SOLUTION: A molded body forming step for forming a fiber molded body from short fibers of silicon carbide based fibers having a heat resistance of 1000 ° C. or higher, and a sol-gel solution containing a heat resistant compound having a heat resistance of 1000 ° C. or higher is prepared. A sol-gel solution preparation step, an impregnation / drying / calcination step of impregnating, drying, and calcining the fiber molded body with a sol-gel solution; and a crystallization step of crystallizing the impregnated, dried, and calcined fiber molded body. Become. [Selection] Figure 1 |