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Riser material and production method thereof

A technology of aggregate and content, applied in the field of riser material and its production, can solve the problems of reducing the yield of the casting process, declining mechanical properties, wasting molten steel energy consumption, etc. quality effect

Active Publication Date: 2013-06-05
CHINA ERZHONG GRP DEYANG HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Riser feeding has little effect on shrinkage porosity, and due to the formation of contact heat joints and physical heat joints, shrinkage defects, serious carburization, and out-of-tolerance components appear at the root of the riser, which reduces the casting process yield and wastes energy consumption of molten steel; moreover In severe cases, the central part of large castings will have loose structures, coarse grains, and reduced mechanical properties.

Method used

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  • Riser material and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 Production of riser material of the present invention

[0044] Take kyanite, industrial alumina, and kaolin micropowder according to 30 parts, 5 parts, and 5 parts by weight; the chemical composition after material mixing: 45.5% of silicon dioxide, 46.5% of aluminum oxide, and no more than 1%, the content of potassium, sodium, calcium, and magnesium oxides is not more than 1.5%; the amorphous phase in the aggregate accounts for 65%; the kyanite has a particle size of less than 30 μm, the kyanite content > 95%, and the total iron content < 1.5% micronized powder. The aluminum oxide content of industrial alumina micropowder is ≥98%, Fe2O3<0.5%; the particle size is ≥320 mesh. Put the above materials in a mixing tank equipped with a stirrer and stir them well for 10 minutes, then add 2.0 parts of ethyl silicate, 0.5 parts of polystyrene hollow spheres, 0.01 parts of ammonium chloride, and 1.5 parts of aluminum hexafluorosilicate, fully Stir, then add water w...

Embodiment 2

[0046] Embodiment 2 Production of riser material of the present invention

[0047] Kyanite, SiO2 micropowder, and kaolin micropowder are taken in parts by weight of 55, 10, and 5; the chemical composition of the materials after mixing is: containing 49.1% of silicon dioxide, 46% of aluminum oxide, and no more than 1% of ferric oxide , the content of potassium, sodium, calcium, and magnesium oxides is not more than 1.5%; the amorphous phase in the aggregate accounts for 65%; the kyanite has a particle size of less than 30 μm, the content of kyanite is more than 95%, and the content of total iron is less than 1.5%. micronized powder. The silicon oxide content of SiO2 micropowder is ≥98%, Fe2O3<0.5%; the particle size is ≥320 mesh. Put the above materials in a mixing tank equipped with a stirrer and stir them well, then add 1.5 parts of ethyl silicate, 2.5 parts of polystyrene hollow spheres, 0.1 parts of ammonium chloride, and 1 part of aluminum hexafluorosilicate, and stir wel...

Embodiment 3

[0049] Embodiment 3 Production of riser material of the present invention

[0050] According to the method in above-mentioned embodiment 2, riser material of the present invention is produced, and the proportioning of its component is shown in Table 1.

[0051] Table 1 The component distribution ratio (parts by weight) of the riser material of the present invention

[0052]

[0053]

[0054]

[0055] The properties of the riser materials produced in the above examples were measured, and the results were: thermal conductivity not greater than 0.15w / m.k (800°C), refractoriness ≥ 1850°C, service temperature up to 1600°C, reburning line change rate (1000°C) not more than 0.13. The porosity is greater than 65%, and the bulk density is 0.45-0.50 g / cm 3 .

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Abstract

The invention relates to a riser material and a production method thereof, belongs to the technical field of riser materials and aims to provide a riser material applicable to a large casting. The riser material is prepared from the following components in parts by weight: 30-95 parts of aggregate, 0.5-2 parts of binding agent, 5-25 parts of foaming agent and 0.01-1.5 parts of assistant, wherein the aggregate is at least one of kyanite, aluminum oxide micropowder, kaolin and SiO2 micropowder; the binding agent is at least one of ethyl silicate, carboxymethyl cellulose, lignin calcium sulfonate, dextrin, polyvinyl alcohol and phenolic resin; the foaming agent is at least one of sawdust, polystyrene hollow spheres, carbon powder, rice hulls and ammonium chloride; and the assistant is at least one of aluminum trifluoride and aluminum fluosilicate.

Description

technical field [0001] The invention relates to a riser material and a production method thereof, belonging to the technical field of riser materials. Background technique [0002] The role of risers on castings has been highly valued in the casting field for a long time. The quality of its thermal insulation and feeding performance is not only related to the sequential solidification of castings, but also related to the quality of castings, the yield of casting technology, and the utilization rate of molten steel for feeding. Wait. But there are various problems in the riser of large castings, especially extra large steel castings such as large rolling mill archways, which cannot meet the requirements of process technology. Due to the high heat load of super-large steel castings, when these risers are in contact with molten steel, they will be burned, deformed, and fail to achieve the purpose of heat preservation and feeding. There are many types of riser materials, mainl...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 白敏唐贤其
Owner CHINA ERZHONG GRP DEYANG HEAVY IND
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