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Corundum-mullite crucible

A technology of mullite and corundum is applied in the field of crucibles for calcining high-temperature powders, which can solve the problems of reducing the service life of the crucibles, and achieve the effects of improving product quality, good molding effect and high thermal stability.

Inactive Publication Date: 2010-12-22
中山市华山特种陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The crucible is a special equipment used in high-temperature smelting industries such as steelmaking and powder calcination. The use of the crucible is an intermittent operation process. The crucible is in a high-temperature state when carrying high-temperature materials, and the crucible is in a relative The low temperature state of the crucible, so recycled, makes the crucible in the state of rapid cooling and rapid heating for a long time. Since the crucible is a kind of fragile equipment, the severe temperature change of rapid cooling and rapid heating will cause cracks in the crucible and reduce the service life of the crucible. It is also a test for the corrosion resistance of the crucible to be washed again and again

Method used

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  • Corundum-mullite crucible

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 56kg of corundum, 15kg of mullite, 10kg of andalusite, 10kg of cement, 10kg of calcined alumina, an appropriate amount of silicon micropowder and an appropriate amount of fiber, mix and stir, add water to make a slurry, inject the slurry into a mold, and vibrate for molding at the same time. The shaped green body is air-dried and further dried, and finally the green body is calcined at high temperature to obtain the corundum mullite crucible of the present invention.

Embodiment 2

[0016] Take 65kg of corundum, 10kg of mullite, 8kg of andalusite, 8kg of cement, 8kg of calcined alumina, an appropriate amount of silicon micropowder and an appropriate amount of fiber, mix and stir, add water to make a slurry, inject the slurry into a mold, and vibrate for molding at the same time. The shaped green body is air-dried and further dried, and finally the green body is calcined at high temperature to obtain the corundum mullite crucible of the present invention.

Embodiment 3

[0018] Take 75kg of corundum, 5kg of mullite, 5kg of andalusite, 5kg of cement, 5kg of calcined alumina, an appropriate amount of silicon micropowder and an appropriate amount of fiber, mix and stir, add water to make a slurry, inject the slurry into a mold, and vibrate for molding at the same time. The shaped green body is air-dried and further dried, and finally the green body is calcined at high temperature to obtain the corundum mullite crucible of the present invention.

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Abstract

The invention discloses a corundum-mullite crucible. The crucible is characterized by comprising the following raw materials in percentage by weight: 56 to 75 percent of corundum, 5 to 15 percent of mullite, 5 to 15 percent of andalusite, 1 to 10 percent of cement, 5 to 15 percent of calcined alumina, proper silicon micropowder and proper fiber; and the crucible is prepared by the following steps: mixing and stirring the raw materials; preparing slurry by adding water into the raw materials; injecting the slurry into a die for molding, and shaking the die simultaneously; naturally airing the formed blank, and baking the blank for further drying; and finally sintering the blank to obtain the corundum-mullite crucible. The corundum-mullite crucible has the advantages of excellent high-temperature strength, excellent thermal shock and corrosion resistance, small thermal expansion coefficient, high thermal stability, oxidation resistance, certain thermal shock fatigue resistance, outstanding slag resistance, high use temperature (1,750 DEG C), long service life and excellent chemical stability, and has excellent industrial prospect.

Description

technical field [0001] The invention relates to a crucible, in particular to a crucible used in the steelmaking industry for calcining high-temperature powder. Background technique [0002] The crucible is a special equipment used in high-temperature smelting industries such as steelmaking and powder calcination. The use of the crucible is an intermittent operation process. The crucible is in a high-temperature state when carrying high-temperature materials, and the crucible is in a relatively The low-temperature state of the crucible, so recycled, makes the crucible in the state of rapid cooling and rapid heating for a long time. Since the crucible is a kind of fragile equipment, the severe temperature change of rapid cooling and rapid heating will cause cracks in the crucible and reduce the service life of the crucible. Flushing again and again is also a test for the corrosion resistance of the crucible. In order to meet the needs of the above-mentioned industries, the ap...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 潘起雄
Owner 中山市华山特种陶瓷有限公司
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