METHOD OF MANUFACTURE OF LARGE-SIZE CRUCIBLES OUT OF QUARTZ CERAMICS Russian patent published in 2005 - IPC

FIELD: refractory industry; production of large-size crucibles out of quartz ceramics.

SUBSTANCE: the invention is pertaining to the field of refractory industry, in particular, to production of large-size crucibles out of quartz ceramics. The invention offers the method of manufacture of the based on a quartz glass large-size square crucibles used in production of the "solar" silicon. On the basis of the quartz glass (SiO₂ > 99.5 %) using its wet milling produce the highly-concentrated suspensions with density of 1.88-1.92 g/cm₃, expose them to stabilizations, introduce a grainy filler (50-400 microns) in amount ensuring its contents in the molding system within the limits of 25-35 %. Molding of the crucibles castings is exercised in the porous molds. At that filling-up of the molds is conducted at their positions "the bottom up" and the molds disassembling and removal of the castings - at the position of the mold "bottom down". Hardening is achieved by sintering at the temperature of 1100-1200°C or by a hydrothermal treatment at the temperatures of 150-200°C with a soaking time of 4-12 hours. The technical result of the invention is obtaining a high density with uniform properties state of a material at the stage of molding with porosity below 13 %.

EFFECT: the invention ensures obtaining of a high density with uniform properties state of a material at the stage of molding with porosity below 13 %.

6 cl, 5 dwg, 4 ex