The manufacturing process of polycrystalline mullite refractory fibers is different in chemical composition from A80 and A95 polycrystalline alumina fibers. It is obtained by chemical proportioning based on the technical standard of forming the most stable phase or forming a single crystal in the Al2O3 • SiO2 binary phase diagram. The production of polycrystalline mullite refractory fibers also adopts the colloid method, with a chemical composition of 72% -75% Al2O3 and 25% -28% SiO2. The manufacturing principle involves mixing soluble metal aluminum powder, hydrochloric acid, and industrial soft water into a transparent colloidal solution with a certain viscosity, which is then spun or sprayed into a filamentous body through a spinning wheel, and subjected to low-temperature drying and high-temperature heat treatment for pre crystallization.
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