| abstract |
Molded articles of high-purity alumina fibers, which are porous materials in which heat resistance is high, and in particular, deformation and linear shrinkage in heat cycles at a temperature more than 1700°C are small, can be obtained by a method comprising the steps of spinning a spinning solution containing an alumina fiber precursor as the main component to obtain precursor fibers, prefiring these precursor fibers at 400 to 1000°C to form prefired fibers, and then molding and calcining these prefired fibers. n Sintering between the fibers can be achieved at a relatively low temperature, and in particular, even when no inorganic binder component is added, the molded articles of high-purity alumina fibers can be obtained by a simple process. |