Lightweight corundum-mullite castable and preparation method thereof
A technology of mullite and castables, which is applied in the field of lightweight castables, can solve the problems of inability to prepare structural refractory materials, low chemical purity of refractory materials, and inability to cast on-site molding, and achieve controllable apparent porosity and pore size, Strong resistance to medium erosion and convenient construction
Inactive Publication Date: 2013-08-14
WUHAN UNIV OF SCI & TECH
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The invention relates to a lightweight corundum-mullite castable and a preparation method thereof. The the technical scheme is that the preparation method comprises the following raw materials of 40-70wt% of porous corundum-mullite ceramic particles, 10-25wt% of porous corundum-mullite ceramic fine powder, 10-20wt% of corundum fine powder, 1-3wt% of silicon oxide micro powder, 2-4wt% of active alpha aluminum oxide micro powder, 1-5wt% of calcium aluminate cement and 1-5wt% of rho aluminum oxide fine powder; water and a water reducing agent are taken as additives, wherein the weight of the water is 8-20wt% of that of the raw materials, and the weight of the water reducing agent is 0.02-1wt% of that of the raw materials; and the method comprises the steps of: evenly stirring, casting for molding, naturally drying a molded green body for 24h, and finally, drying the product for 8-48h at the temperature of 110 DEG C. The prepared product not only has the performances of high apparent porosity, high strength, low heat conductivity, high medium erosion resistance and the like, but also has the advantages of being convenient to construct, environment-friendly, controllable in apparent porosity and pore size, small in volume change after being burnt, and the like, thus being suitable for a working layer or a permanent layer of a high-temperature kiln or container with the working temperature lower than 1600 DEG C.
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Property | Measurement | Unit |
Particle size | <= 88.0 | µm |
Bulk density | 1.93 ~ 2.25 | g/cm³ |
Flexural strength | 3.0 ~ 8.0 | MPa |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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