Method for preparing hollow magnesium aluminate spinel ceramic fiber by using reed fibers

A technology for hollow magnesia-aluminum spinel and reed fibers, which is applied in the field of preparing hollow magnesia-aluminum spinel ceramic fibers, can solve the problems of high requirement of reaction conditions, unfavorable thermal insulation performance, large energy consumption of solid-phase method, etc. Good appearance, strong alkali corrosion resistance, and the effect of shortening the immersion time

Active Publication Date: 2019-05-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the solid-phase method consumes a lot of energy, has low efficiency, is easy to mix impurities, and the purity of the product is low.
The reaction conditions and reaction equipment requirements of the vapor deposition method are very high, which makes the production cost too high
And the magnesia-aluminum spinel fiber that above-mentioned method makes is all solid shape, is unfavorable for the promotion of its thermal insulation performance (Cui Hongliang, Liu Heyi, Qiao Jian etc. Sol-gel method prepares continuous MgAl 2 o 4 Fiber[J]. Journal of Synthetic Crystals, 2014,43(12):3191-3196)

Method used

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  • Method for preparing hollow magnesium aluminate spinel ceramic fiber by using reed fibers
  • Method for preparing hollow magnesium aluminate spinel ceramic fiber by using reed fibers
  • Method for preparing hollow magnesium aluminate spinel ceramic fiber by using reed fibers

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Experimental program
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Effect test

Embodiment 1

[0040] Get 2.943g of aluminum chloride hexahydrate and dissolve in 20ml of alcohol with a volume fraction of 50%, add 1.238g of magnesium chloride hexahydrate, prepare a concentration of 10% impregnating solution, and now the mol ratio of aluminum to magnesium is 2: 1. Immerse the reed fiber in the above solution, soak for 15 minutes, take it out and dry it; raise the temperature of the dried reed fiber to 1100°C in the air, keep it warm for 1h, and the heating curve is: room temperature ~ 300°C, 2°C / min; 300~ 1100°C, 10°C / min, heat preservation at 1100°C for 60 minutes, and finally cooling with the furnace to prepare hollow magnesium-aluminum spinel fibers. From figure 1 The X-ray diffraction pattern in the figure shows that the material has a molecular formula of Al 2 o 3 · MgO. figure 2 The high magnification image of the scanning electron microscope of the prepared magnesium aluminum spinel fiber shows that the surface of the fiber is relatively smooth, the degree of ...

Embodiment 2

[0042] Take 4.43g of aluminum chloride hexahydrate and dissolve it in 20ml of alcohol with a volume fraction of 50%, add 2.79g of magnesium chloride hexahydrate, and prepare an impregnation solution with a mass fraction of 15%. At this time, the molar ratio of aluminum to magnesium is 133 :100. Immerse the reed fiber in the above solution, soak for 15 minutes, take it out and dry it; raise the temperature of the dried reed fiber to 1100°C in the air, keep it warm for 1h, and the heating curve is: room temperature ~ 300°C, 2°C / min; 300~ 1100°C, 10°C / min, heat preservation at 1100°C for 60 minutes, and finally cooling with the furnace to prepare hollow magnesium-aluminum spinel fibers. Figure 4 Shown is the high magnification image of the prepared magnesium aluminum spinel fiber scanning electron microscope, it can be seen that the hollowness of the fiber is relatively high, and the wall thickness of the fiber is relatively uniform. Figure 5 Shown is a low magnification image...

Embodiment 3

[0044] Get 1.593g of aluminum chloride hexahydrate and dissolve in 20ml of alcohol with a volume fraction of 50%, add 0.224g of magnesium chloride hexahydrate, and prepare a concentration of 5% impregnating solution. At this time, the mol ratio of aluminum element to magnesium element is 600: 100. Immerse the reed fiber in the above solution, soak for 15 minutes, take it out and dry it; raise the temperature of the dried reed fiber to 1100°C in the air, keep it warm for 1h, and the heating curve is: room temperature ~ 300°C, 2°C / min; 300~ 1300°C, 10°C / min, heat preservation at 1300°C for 60 minutes, and finally cooling with the furnace to prepare hollow magnesium-aluminum spinel fibers. Figure 6 Shown is a low magnification image of a magnesium aluminum spinel fiber scanning electron microscope, showing that the fiber length is long and continuous.

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Abstract

The invention discloses a method for preparing a hollow magnesium aluminate spinel ceramic fiber by using reed fibers. According to the method, natural reed is used as a template and an ethanol watersolution is used as a dipping solvent, the natural reed is dipped in a mixed ethanol water solution of aluminum salt and magnesium salt, drying is carried out, and then sintering is carried out in anoxygen atmosphere at a high temperature. In the sintering process, aluminum chloride and magnesium chloride react to generate aluminum oxide and magnesium oxide; reed fibers are decomposed; finally the reed which serves as a template is disappeared; the generated aluminum oxide and magnesium oxide form a stable magnesium-aluminum spinel structure; and the hollow structure of the reed template is retained. The prepared magnesium-aluminum spinel fiber is of a hollow tubular structure, has good toughness and high hollowness and bulkiness, and has good thermal shock stability, chemical erosion resistance and wear resistance. Solid phases are separated from each other by gas existing in the hollow fibers, so that the heat transfer rate is reduced, heat conductivity of the ceramic material is reduced, and the heat insulation property of the ceramic material is good.

Description

technical field [0001] The invention belongs to the field of fire-resistant and heat-insulating materials, and in particular relates to a method for preparing hollow magnesium-aluminum spinel ceramic fibers by using natural reed fibers. Background technique [0002] The chemical formula of magnesium aluminum spinel is MgO Al 2 o 3 , has the characteristics of high melting point (2135°C), small thermal expansion coefficient, low thermal conductivity, good thermal shock stability, and strong alkali corrosion resistance. It is widely used in pigment industry, refractory materials, fine ceramics, wear-resistant materials and other fields. At present, the magnesia-aluminum spinel used in refractory materials is synthesized by artificial synthesis. Because Al-O and Mg-O are strong ionic bonds with equal strength, magnesium aluminum spinel has a firm structure. Magnesium-aluminum spinel has good thermal shock stability, chemical corrosion resistance and wear resistance, and can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/443D01F9/08C04B35/66C04B35/622
Inventor 王天驰奚畅戴生伢黄雪君马可夫王轶飞
Owner NANJING UNIV OF SCI & TECH
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