Manufacture of opaque quartz glass composite material, used as starting material of permanent shaping-die manufacture of solar silicon melting, involves forming composite slip by mixing quartz glass granules and homogenous base slip

摘要

The silica particles having specific particle size are obtained by grain refining non-crystal silica granules in a liquid. The composite slip having density of at least 1.85 g/cm3 is obtained by mixing quartz glass granules with the prepared homogenous base slip. The composite slip is introduced into a shaping die and formation of porous substrate is performed, to obtain an opaque quartz glass composite material. The silica particles having particle size (D50) of 15 micron or less and D90 of 50 micron or less are obtained by performing grain refining of non-crystal silica granules in a liquid. The homogenous base slip having solid content of at least 75% is manufactured by homogenizing the slip by pH reduction. A composite slip having density of at least 1.85 g/cm3 is obtained by mixing the quartz glass granules with the homogenous base slip. The composite slip is introduced into a shaping die, then a porous substrate is formed by drying and sintering the substrate, to obtain an opaque quartz glass composite material. The slip contains silica particles of size less than 100 micron and quartz glass granules of size greater than 100 micron. Independent claims are included for; (1) A composite material; and (2) Use of the above composite material as starting material of permanent shaping-die manufacture of solar silicon melting.