Analysis of Properties and Application Prospects of Alumina Fibers

[China Aluminum Industry Network] Alumina fiber (polycrystalline mullite fiber) Compared with non-oxide fibers such as carbon fiber and silicon carbide fiber, alumina fiber not only has excellent properties such as high strength, high modulus, and high temperature resistance. And there are good high temperature oxidation resistance, corrosion resistance and electrical insulation. Alumina fibers (polycrystalline mullite fiber) can be composited with resins, metals or ceramics to produce high-performance composite materials, which are widely used in aviation, aerospace, military and high-tech fields.
The production process of alumina fiber (polycrystalline mullite fiber) is relatively simple, and the requirements for production equipment and production conditions are not high. Compared with carbon fiber, the cost of alumina fiber (polycrystalline mullite fiber) is much lower. This makes it possible to use a large number of alumina fibers. At present, many foreign companies have produced various types of high-performance alumina fibers.
US ICI company uses Bu Nei Men method to produce alumina staple fiber under the trade name of Saffil. Its use temperature can reach 1200-1600°C, and it has been applied to the lining of industrial sintering furnace.
American 3M Company produces Nexte1 series alumina fiber (polycrystalline mullite fiber) by the sol process, and the most representative species is Nexte1312.
Japan's Sumitomo Chemical Co., Ltd. uses pre-polymerization to produce Altex alumina fibers, whose components are Al2O3, SiO2, and B2O3.
DuPont Co., Ltd. uses the silt method to produce EP alumina fibers with an alumina content of 99.9%.
Japan's Mitsui Mining also produced continuous alumina fibers with alumina content above 95% through a slurry process.
In China, the success of the earlier pilot test was achieved by Zhejiang Ou Shi Man Crystal Fiber Co., Ltd.. After winning the tender for the national economic and trade season, the company built a continuous alumina fiber production line in China. It is currently a representative domestic production company. Has built a domestic scale of polycrystalline mullite fiber production base.
Alumina fiber (polycrystalline mullite fiber) is mainly used for high-temperature insulation materials (short fibers) and reinforced composite fire-resistant (long fibers), and can be woven into various shapes of fiber products such as non-woven fabrics, braids, and ropes.
Industrial energy saving effect in the field of high temperature furnaces Alumina short fiber has outstanding high temperature performance, mainly used as adiabatic refractory material, in the metallurgical furnace, ceramic sintering furnace or other high temperature furnace in the body lining insulation material. Because of its low density. The good heat insulation and small heat capacity not only can reduce the quality of the furnace, but also improve the temperature control accuracy and the energy saving effect is remarkable. Alumina fiber (polycrystalline mullite fiber) has better energy-saving effect in high-temperature furnaces than ordinary firebricks or high-temperature paints, and the energy-saving amount is far greater than the heat loss. The reason is not only that the heat loss is reduced, but more importantly. The convective heat transfer of the furnace gas to the furnace wall is strengthened so that the furnace wall can be given more heat, and then passed through the national emblem to the material, thereby increasing the heating speed and production capacity of the material.

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