High-purity alumina fiber and preparation method thereof

A technology of alumina fiber and oxide, applied in the field of heat insulation of refractory materials, can solve the problem of low temperature of fiberboard, achieve high Young's modulus, improve mechanical properties, and improve thermal insulation performance

Inactive Publication Date: 2014-10-08
南京理工宇龙新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the use temperature of fiberboard is not high (≤1200℃)

Method used

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  • High-purity alumina fiber and preparation method thereof
  • High-purity alumina fiber and preparation method thereof
  • High-purity alumina fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take 40g of anhydrous aluminum chloride, dissolve it in 500ml of water, pour the aluminum chloride solution and 38.0g of aluminum powder into a reaction kettle with heating and reflux, heat at 90-100°C for 2-2.5h, cool and filter to obtain polychloride Aluminum mother liquor (Al 2 o 3 The mass fraction of 14.8%). Then add 20ml of lactic acid as a colloidal stabilizer and spinning aid, vacuum concentrate at 65-70°C for 1.5-2 hours, and make a colloid with a viscosity of 20-35Pa.s.

[0038] The self-made centrifugal spinning machine is used for centrifugal spinning, and the sol forms white and soft gel fibers under the centrifugal force and the secondary traction of hot air flow, and is collected by a drum to form a fiber cover. Such as figure 1 As shown, the diameter of the fiber is 15-20um, the length is 30-80cm, and the surface is smooth, and the cross-section of the fiber is circular. Among them, the diameter of the spinning head is 45mm, the height is 35mm, and 1...

Embodiment 2

[0041] Take 350g of alumina fibers obtained in Example 1, add 600g of polyaluminum chloride solution, 10g of polyacrylamide, and 40g of spinel micropowder, fully stir and make pulp, and shorten the stirring time as much as possible. A wet billet is produced in a corresponding mold by manual pressing, and dried at 90°C for 50 hours to remove moisture and internal binder gel to obtain a dry billet.

[0042] The dry compact was sintered at 1600°C for 2 hours, and the main crystal phase was α-Al 2 o 3 fiberboard blanks. Cut according to the required size, and after surface treatment, the final alumina fiber board is obtained. The density of the product is 0.54 / cm 3 ; Refractoriness is 1600~1700℃; Reburning permanent line change: 1400℃×2h≤0.3%; Cold compressive strength: ≥2.4Mpa; Thermal conductivity 1000℃: <0.24W / (m·K).

Embodiment 3

[0044] Take 40g of anhydrous aluminum chloride, dissolve it in 500ml of water, put the aluminum chloride solution and 35.6g of aluminum powder in a certain ratio (n(Al):(Cl)=1.8) into a trident flask with heating and reflux, at 90°C Heating for 2 to 3 hours, cooling and filtering to obtain polyaluminum chloride solution (Al 2 o 3 The mass fraction of 14.2%).

[0045] Get the polyaluminum chloride solution prepared above, according to Al 2 o 3 Be the chemical composition of 98:1 with MgO mass ratio, measure the basic magnesium carbonate of 2.0g (chemical formula 4Mg(OH) 2 · MgCO 3 ) was dissolved in 10 g of glacial acetic acid to form a transparent solution. After mixing, 30 ml of glacial acetic acid was added as spinning aid and stabilizer. After vacuum concentration at 67°C for 2 hours, a colloid with a viscosity of 30P.s was obtained. Spin on a self-made centrifugal spinning machine to obtain gel fibers with a length of 30-50 cm and a diameter of 15-20 um. Wherein, t...

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Abstract

The invention discloses a preparation method of a high-purity alumina fiber. The alumina fiber takes anhydrous aluminium chloride and aluminium micro powder as raw materials and acetic acid or lactic acid as a stabilizer and a spinning auxiliary and is added with an oxide second phase (MgO, SiO2, Y2O3, ZrO2 and the like) with mass fraction of 0-2%, so that mechanical properties of the alumina fiber at room temperature and high temperature are improved. An alumina fibreboard is composed of alumina fibers, an inorganic binder, an organic binder and an additive in a mass ratio of (30-40) to (55-65) to (0-1) to (4-5). A preparation method of the alumina fibreboard is characterized by comprising the following steps: preparing colloid, carrying out centrifugal spinning, preparing alumina fibers, preparing a wet blank, carrying out high temperature treatment, and machining, so that the alumina fibreboard finished product is obtained. The high-purity alumina fiber product has excellent thermal insulation properties and mechanical properties, and an operating temperature is increased, so that an operating temperature range of a similar product is expanded.

Description

technical field [0001] The invention belongs to the technical field of heat insulation of refractory materials, and in particular relates to a preparation method of high-purity alumina fiber and a product thereof. Background technique [0002] Alumina fiber is a high-performance inorganic fiber whose main component is α-Al 2 o 3 , with long fiber, short fiber, whisker and other forms. Compared with carbon fiber and metal fiber, it has excellent properties such as high strength, high modulus, high temperature resistance, and good high temperature oxidation resistance and electrical insulation. Alumina fiber has good surface activity and is easy to compound with metals, ceramics and other matrix materials; it also has the advantages of low thermal conductivity, low thermal expansion coefficient, and good thermal shock resistance; in addition, the raw material cost of alumina fiber is low and the production process is simple. , with high cost performance. [0003] At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 刘和义乔健黄振进朱玉龙崔宏亮
Owner 南京理工宇龙新材料科技股份有限公司
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