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Amorphous refractory fiber

Aluminum silicate fiber with Al2O3 content of 45~60%. It is prepared by quenching the high-temperature molten liquid in the process of fibrosis, and it is in an amorphous glassy structure. The fiber made from natural raw materials (such as kaolin or refractory clay) is called ordinary aluminum silicate refractory fiber (see figure); The fiber made from pure alumina and silicon oxide is called high-purity aluminum silicate refractory fiber; Aluminum silicate fiber containing chromium is added with about 5% chromium oxide; The Al2O3 content of about 60% is called high-alumina fiber.

There are two methods for manufacturing amorphous refractory fibers, namely, blowing method and spinning method, which are collectively called melting method. The injection method is to melt the raw material in the electric arc furnace or resistance furnace at more than 2000 ℃, and then use compressed air or superheated steam to spray the molten liquid stream to produce fibers. The wire throwing method is to drop the molten liquid stream onto the multi-stage rotary rotor and turn it into fiber by centrifugal force.