SiC whisker reinforced corundum breathable refractory material and preparation method thereof

A technology of refractory materials and corundum, which is applied in the field of corundum breathable refractory materials, can solve the problems of uneven distribution of pores, large bubbles, and low eutectic point, and achieve the effects of ensuring uniformity of ventilation, increasing contact area, and uniform distribution of pores

Active Publication Date: 2021-05-14
冷水江市博晟新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, there are still some problems in the existing breathable refractory materials: (1) It is difficult to form a neck connection between the particles, and the strength is low, resulting in a short service life ; (2) The dense aggregate is not breathable, the pores are unevenly distributed, the size is large, and the bubbles blown out are large, which is not conducive to the adsorption of small-sized inclusions in molten steel; (3) The composition is complex, the eutectic point is low, and a liquid phase is generated at high temperature, which affects service performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] Step 1, preparation of spherical porous corundum particles

[0048] Step 1.1, using 93-98.5wt% aluminum hydroxide fine powder, 0.5-3wt% magnesia fine powder and 1-4wt% sawdust fine powder as raw materials, place the raw materials in a mixer and mix for 1 ~3 hours; then add 4~12wt% of the binder of the raw materials into the mixer, and stir for 10~20 minutes to obtain a mixture.

[0049] Step 1.2, preparation of three spherical green bodies

[0050] Put the mixture in a granulator, add 2 to 8 wt% of water from the mixture, and spray it under the condition that the rotation speed of the granulator is 4 rpm to obtain spherical particles with a particle size of 4.5±0.3mm. Body I;

[0051] Put the mixed material in a granulator, add 2 to 8 wt% of the mixed material water, and spray it under the condition that the rotational speed of the granulator is 12 rpm to obtain spherical particles with a particle size of 1.8 ± 0.3mm Body II;

[0052] Put the mixed material in a gra...

Embodiment 1

[0081] A SiC whisker-reinforced corundum gas-permeable refractory material and a preparation method thereof. The preparation method described in this embodiment is:

[0082] Step 1, preparation of spherical porous corundum particles

[0083] Step 1.1, with 93wt% aluminum hydroxide fine powder, 3wt% magnesia fine powder and 4wt% sawdust fine powder as raw materials, the raw materials are placed in a mixer and mixed for 1.0 hour; Add 4wt% binder of the raw material into the feeder, and stir for 20 minutes to obtain a mixture.

[0084] Step 1.2, preparation of three spherical green bodies

[0085] Put the mixture in a granulator, add 8wt% water of the mixture, and spray it under the condition that the speed of the granulator is 4 revolutions per minute to obtain a spherical green body with a particle size of 4.5 ± 0.3mm I;

[0086] Put the mixed material in a granulator, add 8wt% water of the mixed material, and spray it under the condition that the rotational speed of the gr...

Embodiment 2

[0108] A SiC whisker-reinforced corundum gas-permeable refractory material and a preparation method thereof. The preparation method described in this embodiment is:

[0109] Step 1, preparation of spherical porous corundum particles

[0110] Step 1.1, with 94.5wt% aluminum hydroxide fine powder, 2.3wt% magnesia fine powder and 3.2wt% sawdust fine powder as raw material, said raw material is placed in the mixer, mixes 2.5 hours; Add 6wt% binder of the raw material into the mixer, and stir for 17 minutes to obtain a mixture.

[0111] Step 1.2, preparation of three spherical green bodies

[0112] Put the mixture in a granulator, add 6wt% water of the mixture, and spray it under the condition that the speed of the granulator is 4 revolutions per minute, to obtain a spherical green body with a particle size of 4.5 ± 0.3mm I;

[0113] Put the mixture in a granulator, add 6wt% water of the mixture, and spray it under the condition that the speed of the granulator is 12 revolution...

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Abstract

The invention relates to a SiC whisker reinforced corundum breathable refractory material and a preparation method thereof. According to the technical scheme, 15-20 wt% of modified spherical porous corundum particles I, 31-39 wt% of modified spherical porous corundum particles II and 17-25 wt% of modified spherical porous corundum particles III are used as aggregates, and 2-4 wt% of magnesia fine powder, 10-22 wt% of corundum fine powder, 3-6 wt% of [alpha]-Al2O3 fine powder and 2-5 wt% of monatomic silicon powder are used as matrixes; the preparation method comprises the following steps: uniformly mixing the aggregate in a stirrer, adding sulfurous acid paper pulp waste liquid accounting for 3-7wt% of the sum of the aggregate and the matrix, uniformly mixing, adding the matrix, stirring, forming, drying, heating to 1300-1500 DEG C under a carbon burying condition, preserving heat, and cooling to obtain the SiC whisker reinforced corundum breathable refractory material. The prepared product is uniform in ventilation, high in strength, long in service life, excellent in thermal shock resistance and high in molten steel inclusion removal efficiency.

Description

technical field [0001] The invention belongs to the technical field of corundum breathable refractory materials. In particular, it relates to a SiC whisker-reinforced corundum gas-permeable refractory material and a preparation method thereof. Background technique [0002] Inclusions are an important factor limiting the quality improvement of high-quality steel and special steel. Blowing inert gases such as argon into molten steel through breathable refractory materials is an important process for homogenizing the temperature and composition of molten steel and removing inclusions during the refining process, which has an important impact on improving steel quality. [0003] At present, research on breathable refractories has been reported. Such as literature technology (Jia Gaoyang et al. Effect of particle size on the performance of dispersed corundum breathable brick materials. Refractories, 2020, 54(1): 32-36), using fused white corundum particles, Guangxi white mud an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/103C04B35/81C04B35/622C04B35/626C04B38/08
CPCC04B35/103C04B35/622C04B35/62695C04B35/62645C04B38/08C04B2235/5276C04B2235/3826C04B2235/3206C04B2235/428C04B2235/5436C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96Y02P10/20
Inventor 鄢文陈茜琳吴晗陈俊峰魏耀武韩兵强
Owner 冷水江市博晟新材料有限公司
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