The manufacturing process of polycrystalline mullite refractory fiber, s0, binary phase diagram, and A95 polycrystalline alumina fiber, it is based on the formation of the most stable phase or the formation of a single crystal as the technical standard, chemical: ratio to Matching chemistry into gains. The production of polycrystalline mullite refractory fiber also adopts the colloidal method, and the oil principle will be soluble in AlO, which is 72% -75%, and SiO, which is 25% -28%. Its manufacturing metal aluminum powder, hydrochloric acid and industrial soft water are mixed into a transparent colloidal solution with a certain viscosity, and after spinning or spraying the green body into filaments through a turntable, it is dried at low temperature and pre-crystallized by high temperature heat treatment.
Preparation of sols. The colloidal process at room temperature is used to convert the aluminum salt and aluminum containing aluminum into corresponding oxides according to the crystal type, and then add colloidal additives to make a colloidal solution with high viscosity and fiber formation. According to this principle, industrial-grade crystalline aluminum chloride can be selected to prepare an aqueous solution, and metal aluminum powder is dissolved in the solution according to a certain ratio of AVCI. This solution undergoes severe chemical reactions such as hydrolysis and polymerization to form transparent and stable oxygen. Aluminum chloride inorganic colloid - a mother liquor. Since the raw material used, that is, aluminum chloride aqueous solution, is highly corrosive, metal cannot be used in the whole set of equipment and devices. In particular, the material of the container for heating the aluminum chloride aqueous solution to boiling is critical.
According to the chemical composition of the mullite crystal phase, it is necessary to add silica sol to the mother liquor to prepare a colloid. When preparing the colloidal solution, in order to avoid the phenomenon of gelation and precipitation of the colloid, and also to prevent the fiber body from forming a crystal phase during pre-crystallization heating, SiO: enriches at the grain boundary, thereby creating conditions for the production of cristobalite. Some organic acids can be added. After the prepared colloid is heated and concentrated, part of the solvent (mainly physical water) must be removed to make the colloid polymerization viscosity reach the index required for fiber formation. In order to control the rheological properties of the colloid, a certain amount of high molecular polymer should be added to the glue. Due to the large amount of colloidal solution concentration process, long time, strict temperature control, uniformity and high viscosity control requirements, a series of measures should be taken to increase the evaporation area and improve the environment of the colloidal liquid surface, and design a set of high-efficiency concentration system.