Castable cordierite-mullite refractory material and production technique thereof

Abstract

The invention relates to a castable cordierite-mullite refractory material which is prepared from 20-40% of 1.2-0.5mm molochite, 10-25% of 0.5-0.088mm molochite, 0-15% of 0.5-0.088mm synthetic cordierite, 10-35% of <0.088mm synthetic cordierite, 0-20% of <0.088mm synthetic mullite, 1-3% of magnesia micropowder, 2-8% of alumina micropowder, 3-10% of silica fume, 0-15% of calcined kaolin micropowder, 0.01-0.1% of additional third-generation water reducing agent and 4-8% of additional water. The production technique comprises the following steps: proportionally weighing the raw materials, mixing, and forming to obtain a green body; and standing for 12-24 hours to demold, curing at normal temperature for 1-3 days, drying at 40-60 DEG C for 1-2 days, and firing at 1150-1350 DEG C. The invention uses <10 mu m magnesia micropowder instead of common magnesia fine powder, adopts high-purity raw materials to improve the high-temperature properties, adopts abundant synthetic raw materials to reduce the firing shrinkage, and adds proper micropowder to widen the sintering temperature range, thereby solving the contradictions between low magnesia amount and high setting rate, between special shapes and dimensions and low manufacturing cost and between the difficulty in sintering and high performance. The invention develops a novel easy-forming easy-sintering technique, and prepares a refractory material product which has the advantages of special shapes and dimensions, high purity, high strength, high temperature resistance and good thermal shock resistance.

Description

technical field [0001] The invention relates to a cast cordierite-mullite fire-resistant refractory material and its production process, which has the advantages of easy forming, easy maintenance and easy sintering, and the manufactured product has high purity, high strength, high temperature resistance and thermal shock resistance Good characteristics, suitable for manufacturing large and special-shaped refractory products. Background technique [0002] Modern ceramic kilns widely use high-speed burners, air flow agitation, and rapid air cooling to speed up the heat exchange between gas and solid in the kiln; a structure consisting of pillars-beams-shelf boards is used to support the blanks so that the kiln gas and the blanks are in direct contact. ; Kiln furniture materials with low heat storage, high strength, high thermal conductivity and high thermal shock resistance are used to reduce the weight and heat storage of kiln furniture; ultra-light, low heat storage kiln car...

AI Technical Summary

Problems solved by technology

If the hydration activity is improved, the hydration speed can be accelerated, and the low magnesium oxide content can be solved, and the performance of rapid coagulation and high demoulding strength can be obtained, so as to solve the problem of slow hardening speed, and develop a casting molding with practical value. Cordierite-mullite refractory material and its production process

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