Application of Refractory Fiber
The refractory fiber can be used as the lining of the flame at high temperature, but not with the high speed air, molten metal and slag. As a high temperature insulation material, it can also be used as a seal, sound absorption, filter material, and high temperature composite material. The highest service temperature varies with the material. The glass refractory fiber is 1000~1300 degrees, the polycrystalline mullite fiber and the polycrystalline alumina fiber are 1250~1500 degrees, and the zirconia fiber is 1600 degrees.
Refractory fibers are non - compact materials. Metal melts and slag can infiltrate into the fiber and cause the damage of the lining. Therefore, refractory fiber is not generally used for direct contact with molten matter. The strength of refractory fiber products is lower than that of dense refractory materials. Special protection measures should be applied to those parts often subjected to mechanical extrusion, impact and friction. Refractory fiber products are not resistant to scour. When fire-resistant fiber materials are used as lining, the air velocity in the furnace should be less than 10m/s. The atmosphere of furnaces is closely related to the service life of refractory fibers. The highest usage temperature in reducing atmosphere and vacuum should be lower than that in oxidizing atmosphere. Generally, it is lower than 100~150 degrees in reducing atmosphere and 250~300 degrees below vacuum.