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A kind of corundum gas permeable material and preparation method thereof

A breathable material and corundum-based technology, which is applied in the field of corundum-based breathable materials and their preparation, can solve the problems of poor corrosion resistance, uneven distribution of micropowder, reduced work efficiency, etc. Strength, effect of stabilizing breathability

Active Publication Date: 2022-01-04
成都府天高温材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual use process, there are mainly problems such as unstable air permeability, poor corrosion resistance and low high temperature strength of breathable materials.
The existence of the above problems affects the normal rhythm of the iron and steel smelting process and reduces work efficiency
[0003] In the existing preparation technology of breathable materials, although the introduction of additives can promote the sintering of breathable materials and improve the bonding strength, the formed low melting point liquid phase reduces the mechanical strength of breathable materials; although the introduction of fine powder can enhance the densification of the tissue structure and Improve corrosion resistance, but it will affect the gas permeability of the product, and the uneven distribution of fine powder will reduce the stability of product structure and performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A corundum breathable material and a preparation method thereof. The preparation method described in this embodiment is:

[0041] In the first step, 40-50wt% corundum fine powder, 10-15wt% α-Al 2 o 3 Micropowder, 15-20wt% aluminum hydroxide, 5-10wt% aluminum fluoride, 1-5wt% additive, 1-5wt% foaming agent, 1-5wt% foam stabilizer, 0.1-1wt% Mix the water reducer with 1-5wt% calcium aluminate cement to obtain a mixture; then add 15-20wt% water to the mixture, stir evenly, pour into molding, and cure for 10-15 hours to obtain a cured green body .

[0042]The second step is to dry the cured green body at 100-120°C for 12-16 hours, and then heat-treat at 1500-1600°C for 5-7 hours to obtain pre-fired material; The material is crushed and sieved to obtain granular material A with a particle size of less than 0.25 mm and granular material B with a particle size of 0.25 to 1 mm.

[0043] The third step, the α-Al of 20~30wt% 2 o 3 The fine powder, 5-10wt% of the aluminum fl...

Embodiment 2

[0055] A corundum breathable material and a preparation method thereof. The preparation method described in this embodiment is:

[0056] The first step, 50-60wt% corundum fine powder, 15-20wt% α-Al 2 o 3 Micropowder, 10-15wt% aluminum hydroxide, 5-10wt% aluminum fluoride, 1-5wt% additive, 1-5wt% foaming agent, 1-5wt% foam stabilizer, 0.1-1wt% The water reducing agent is mixed with 1-5wt% calcium aluminate cement to obtain a mixture; then 10-15wt% of water is added to the mixture, stirred evenly, poured and molded, and cured for 10-15 hours to obtain a cured green body .

[0057] The second step is to dry the cured body at 90-110°C for 19-24 hours, and then heat-treat it at 1550-1650°C for 5-7 hours to obtain pre-sintered material; and The material is crushed and sieved to obtain granular material A with a particle size of less than 0.25 mm and granular material B with a particle size of 0.25 to 1 mm.

[0058] The third step, the α-Al of 30~40wt% 2 o 3 The fine powder, 1...

Embodiment 3

[0070] A corundum breathable material and a preparation method thereof. The preparation method described in this embodiment is:

[0071] The first step, 50-60wt% corundum fine powder, 10-15wt% α-Al 2 o 3 Micropowder, 10-15wt% aluminum hydroxide, 1-5wt% aluminum fluoride, 1-5wt% additive, 1-5wt% foaming agent, 1-5wt% foam stabilizer, 0.1-1wt% Mix the water reducing agent with 1-5wt% calcium aluminate cement to obtain a mixture; then add 15-20wt% water to the mixture, stir evenly, pour into molding, and cure for 15-20 hours to obtain a cured green body .

[0072] The second step is to dry the cured green body at 100-120°C for 15-18 hours, and then heat-treat at 1600-1700°C for 5-7 hours to obtain pre-fired material; The material is crushed and sieved to obtain granular material A with a particle size of less than 0.25 mm and granular material B with a particle size of 0.25 to 1 mm.

[0073] The third step, the α-Al of 20~30wt% 2 o 3 The fine powder, 5-10wt% of the aluminu...

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Abstract

The invention relates to a corundum breathable material and a preparation method thereof. Its technical scheme is: corundum fine powder, α‑Al 2 o 3 Micropowder, aluminum hydroxide, aluminum fluoride, additives, foaming agent, foam stabilizer, water reducing agent and calcium aluminate cement are mixed, water is added, stirred, poured, cured, dried, and heat treated at 1500-1700°C for 5-7 hour, crushing, and sieving to obtain granular material A with a particle size of less than 0.25 mm and granular material B with a particle size of 0.25 to 1 mm. α‑Al 2 o 3 The fine powder, aluminum fluoride, thickener and water are mixed and stirred to obtain slurry. Then corundum granules, granule material A, granule material B, water reducer, calcium aluminate cement and slurry are mixed, cast, solidified, dried, and heat treated at 1400-1600°C for 5-7 hours to obtain a corundum-based breathable material. The invention has low production cost, and the prepared corundum air-permeable material has the characteristics of high high-temperature flexural strength, stable air permeability, excellent erosion resistance and long service life.

Description

technical field [0001] The invention belongs to the technical field of breathable materials. In particular, it relates to a corundum breathable material and a preparation method thereof. Background technique [0002] Refining technology outside the furnace is an important part of the refining process in the steelmaking process, which can adjust the composition of steel and the temperature of molten steel. The permeable brick is an important functional element for the smooth implementation of this process, and plays a vital role in the reliability and completeness of the refining outside the furnace. The materials of the corresponding air-permeable materials include clay, corundum, spinel, etc. The types of air-permeable materials mainly include diffuse type, through-hole type and slit type. In the actual use process, the main problems of air permeable materials are unstable air permeability, poor corrosion resistance and low high temperature strength. The existence of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/101C04B35/622C04B38/10
CPCC04B35/101C04B35/622C04B38/10C04B2235/3222C04B2235/3208C04B2235/3232C04B2235/77C04B2235/96C04B2235/445C04B2235/5427C04B2235/5436C04B38/0067C04B38/0074
Inventor 陈奇龙钱学义熊伟
Owner 成都府天高温材料科技有限公司
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