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A kind of preparation method of continuous magnesium aluminum spinel fiber

A magnesia-aluminum spinel and fiber technology, which is applied in the field of inorganic refractory materials, can solve the problems of difficulty in large-scale equipment, large fiber diameter, short fiber length, etc., and achieves the effects of simple equipment, low environmental requirements, and high density

Active Publication Date: 2016-03-02
南京理工宇龙新材料科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method has the disadvantages of short fiber length, large fiber diameter, and high brittleness, and the required electric furnace must be designed with a special atmosphere when the structure is designed, so it is difficult to enlarge the equipment.

Method used

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  • A kind of preparation method of continuous magnesium aluminum spinel fiber
  • A kind of preparation method of continuous magnesium aluminum spinel fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 15g of anhydrous AlCl 3 Dissolve in 200ml of water, add 15g of aluminum powder to the solution after hydrolysis is complete, place the mixed solution in a reflux condensing device, heat to a slight boil under normal pressure, control the reflux time for 1.5h, filter out the insoluble matter to obtain polychlorinated Aluminum sol. Get 32.6g basic magnesium carbonate and 120g citric acid and dissolve in 400ml water, stir at room temperature until the solution is transparent and clear to obtain a magnesium citrate solution. Mix the above-prepared polyaluminum chloride sol with the magnesium citrate sol, stir at room temperature until the mixed solution is clear, and add 20ml of acetic acid as a stabilizer to the solution. The solution was pressure-distilled at 80°C to remove excess water until MgAl with a viscosity of 50 Pa·s was obtained. 2 o 4 Sol spinning solution. The spinning solution is injected into the ultra-high-speed centrifugal spinning device, and unde...

Embodiment 2

[0029] Take 15g of anhydrous AlCl 3 Dissolve in 200ml of water, add 15g of aluminum powder to the solution after hydrolysis is complete, place the mixed solution in a reflux condensing device, heat to a slight boil under normal pressure, control the reflux time for 2 hours, filter out the insoluble matter to obtain polyaluminum chloride Sol. Get 32.6g basic magnesium carbonate and 140g citric acid and dissolve in 400ml water, stir at room temperature until the solution is transparent and clear to obtain a magnesium citrate solution. Mix the above-prepared polyaluminum chloride sol with the magnesium citrate sol, stir at room temperature until the mixed solution is clear, and add 25ml of acetic acid as a stabilizer to the solution. The solution was distilled under pressure at 75°C to remove excess water until MgAl with a viscosity of 50 Pa·s was obtained. 2 o 4 Sol spinning solution. The spinning solution is injected into the ultra-high-speed centrifugal spinning device, an...

Embodiment 3

[0031] Take 30g of anhydrous AlCl 3 Dissolve in 400ml of water, add 30g of aluminum powder to the solution after complete hydrolysis, place the mixed solution in a reflux condensing device, heat to a slight boil under normal pressure, control the reflux time for 2 hours, filter out the insoluble matter to obtain polyaluminum chloride Sol. Get 65.2g basic magnesium carbonate and 250g citric acid and dissolve in 800ml water, stir at room temperature until the solution is transparent and clear to obtain a magnesium citrate solution. Mix the above-prepared polyaluminum chloride sol with the magnesium citrate sol, stir at room temperature until the mixed solution is clear, and add 50ml of acetic acid as a stabilizer to the solution. The solution was pressure-distilled at 80°C to remove excess water until MgAl with a viscosity of 50 Pa·s was obtained. 2 o 4 Sol spinning solution. The spinning solution is injected into the ultra-high-speed centrifugal spinning device, and at a hi...

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Abstract

The invention discloses a preparing method for continuous magnesium aluminate spinel fibers. Taking (MgCO3)4 Mg(OH)2 5H2O, acetic acid, water anhydrous AlCl3, aluminum powder and citric acid as raw materials, a MgAl2O4 sol spinning solution is prepared through a sol-gel method, high-speed centrifugation fiber swinging and high-speed hot gas jetting drafting are carried out to obtain MgAl2O4 precursor fibers, and the MgAl2O4 precursor fibers are treated in a thermal mode and sintered to obtain the continuous MgAl2O4 fibers. The preparing method has the advantages of being simple in technology, low in sintering temperature, free of pollution and suitable for mass industrial production, and the raw materials are easy to obtain and low in cost; the prepared MgAl2O4 fibers are continuous, even, soft in texture, high in compactness, and large in aspect ratio, and have good physical and chemical properties.

Description

technical field [0001] The invention belongs to the field of inorganic refractories, in particular to a continuous MgAl 2 o 4 Methods of making fibers. Background technique [0002] Magnesium aluminum spinel (MgAl 2 o 4 ) belongs to the equiaxed crystal system, in which oxygen is the most closely packed, and cations fill the tetrahedral and octahedral gaps, and 8 / 64 tetrahedral gaps and 16 / 32 octahedral gaps are filled in each unit cell. Magnesium aluminum spinel is an oxide ceramic material with high melting point (2135°C), small thermal expansion coefficient, low thermal conductivity, good thermal shock resistance and strong corrosion resistance. Spinel is not corroded by concentrated inorganic acid, hydrofluoric acid, phosphoric acid and caustic alkali at room temperature, and is resistant to slag, molten metal, salt and carbon at high temperature, and has high refractoriness and high temperature strength. At the same time, spinel has the optical properties of sapphi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08C01F7/16C04B35/443
Inventor 刘和义崔宏亮黄振进朱玉龙乔健
Owner 南京理工宇龙新材料科技股份有限公司
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