Porous corundum-magnesium aluminum spinel ceramics with nanopore diameter and preparation method thereof

A magnesia-aluminum spinel and pore size technology, which is applied in ceramic products, other household utensils, household utensils, etc., can solve the problems of poor thermal insulation effect, high air permeability, high volume density, etc., and achieve strong resistance to medium erosion and heat conduction The effect of low coefficient and small bulk density

Active Publication Date: 2020-01-24
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there have been some research works on porous corundum-magnesium aluminum spinel ceramics, such as the patented technology of "porous corundum aggregate with core-shell structure and its preparation method" (CN201410584015.7). Corundum-spinel aggregate of porous corundum balls with shell structure, but large pore size, low apparent porosity, high bulk density and poor thermal insulation effect; another example is "a porous spinel ceramic and its preparation method" (CN200610019551 .8) Patented technology based on magnesite and Al(OH) 3 As a raw material, porous spinel ceramics are prepared by in-situ decomposition and synthesis technology, but the products produced have low strength, large pore size, high air permeability and poor resistance to medium erosion and penetration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A porous corundum-magnesium aluminum spinel ceramic with a nanometer aperture and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0025] Step 1. Put aluminum hydroxide fine powder in a high-temperature furnace, first raise the temperature to 280-450°C at a rate of 0.3-1.2°C / min, keep it warm for 1-2 hours, and then raise the temperature at a rate of 1.5-2.3°C / min to 800~1000℃, keep warm for 1~3 hours, and cool to get alumina powder with high porosity.

[0026] Step 2, according to the high-porosity alumina powder is 60 ~ 70wt%, magnesium chloride solution is 20 ~ 25wt% and magnesite powder is 10 ~ 15wt% ingredients, the high porosity alumina powder Place in a vacuum mixer, vacuumize to below 2.0kPa, then add the magnesium chloride solution and the magnesite fine powder into the vacuum mixer, stir for 10-15 minutes, close the vacuum system to obtain a mixture.

[0027] Step 3: heat the mixture at 110-220°C for 2-3 h...

Embodiment 2

[0031] A porous corundum-magnesium aluminum spinel ceramic with a nanometer aperture and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0032] Step 1. Put aluminum hydroxide fine powder in a high-temperature furnace, first raise the temperature to 280-450°C at a rate of 0.3-1.2°C / min, keep it warm for 2-3 hours, and then raise the temperature at a rate of 1.5-2.3°C / min to 1000~1200℃, keep warm for 3~5 hours, and cool to get alumina powder with high porosity.

[0033] Step 2, according to the high-porosity alumina powder is 65 ~ 75wt%, magnesium chloride solution is 10 ~ 17wt% and magnesite micropowder is 15 ~ 19wt% batching, the alumina powder of described high porosity Place in a vacuum mixer, vacuumize to below 1.5kPa, then add the magnesium chloride solution and the magnesite fine powder into the vacuum mixer, stir for 10-15 minutes, close the vacuum system to obtain a mixture.

[0034] Step 3, heat the mixture at 110...

Embodiment 3

[0038] A porous corundum-magnesium aluminum spinel ceramic with a nanometer aperture and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0039] Step 1. Put aluminum hydroxide fine powder in a high-temperature furnace, first raise the temperature to 280-450°C at a rate of 0.3-1.2°C / min, keep it warm for 2-4 hours, and then raise the temperature at a rate of 1.5-2.3°C / min to 800~1000℃, keep warm for 1~3 hours, and cool to get alumina powder with high porosity.

[0040]Step 2, according to the high-porosity alumina powder is 70 ~ 82wt%, magnesium chloride solution is 15 ~ 20wt% and magnesite powder is 2 ~ 11wt% ingredients, the high porosity alumina powder Place in a vacuum mixer, vacuumize to below 0.5kPa, then add the magnesium chloride solution and the magnesite fine powder into the vacuum mixer, stir for 10-15 minutes, close the vacuum system to obtain a mixture.

[0041] Step 3: heat the mixture at 110-220°C for 2-4 hou...

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Abstract

The invention relates to nano-pore-diameter porous corundum-magnesia-alumina spinel ceramic and a preparation method of same. In a technical scheme, the method includes the steps of: a) successively heating aluminum hydroxide fine powder to 280-450 DED C and 800-1200 DEG C, and respectively maintaining the temperatures to prepare high-porosity aluminum oxide powder; b) preparing materials including, by weight, 60-89% of the high-porosity aluminum oxide powder, 10-25% of a MgCl2 solution and 0.1-19% of micropowder of magnesite, placing the high-porosity aluminum oxide powder in a vacuum stirrer, vacuumizing the vacuum stirrer to lower than 2.0 kPa, adding the MgCl2 solution and micropowder of magnesite, and stirring the components to obtain a mixture; c) performing temperature maintaining to the mixture at 110-220 DEG C, cooling the mixture, performing machine-press shaping, and drying the shaped mixture; and d) successively heating the mixture to 800-1200 DEG C and 1400-1600 DEG C, and respectively maintaining the temperatures to prepare the nano-pore-diameter porous corundum-magnesia-alumina spinel ceramic. The ceramic is nano-scale in diameters of pores and has low volume density, low heat conductivity, high strength, low air permeability and strong anti-medium-invasion capability.

Description

technical field [0001] The invention belongs to the technical field of porous corundum-magnesium aluminum spinel ceramics. In particular, it relates to a porous corundum-magnesium aluminum spinel ceramic with a nanometer aperture and a preparation method thereof. Background technique [0002] Industrial kilns are key equipment for heating in high-temperature industries such as iron and steel, nonferrous metallurgy and building materials, and are also major energy consumers. Heat-insulating refractories are important basic materials for reducing heat loss in industrial kilns, and the development of lightweight and efficient heat-insulating refractories has practical significance for energy conservation and emission reduction in high-temperature industries. Corundum-magnesium-aluminum spinel ceramics have excellent high-temperature mechanical properties and high-temperature chemical stability. Porous materials prepared from corundum-magnesia-alumina spinel composite materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/08C04B35/10C04B35/622
CPCC04B35/10C04B35/622C04B38/085C04B2235/3222C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B38/0074C04B38/0067C04B38/0054
Inventor 鄢文齐江涛陈哲李楠李亚伟
Owner WUHAN UNIV OF SCI & TECH
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