Spinnable alumina sol, its preparation method and alumina continuous fiber

A technology of continuous fiber and aluminum sol, which is applied in the field of continuous alumina fiber, can solve problems affecting the mechanical properties of fibers, achieve good stability, good linear structure, and improve performance

Active Publication Date: 2022-05-20
苏州柔陶新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the spinning aid added in the above preparation process is actually a kind of impurity compared to the fiber. When sintered at high temperature, this type of spinning aid will be carbonized and escape, forming holes and cracks, which will affect the mechanical properties of the fiber.

Method used

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  • Spinnable alumina sol, its preparation method and alumina continuous fiber
  • Spinnable alumina sol, its preparation method and alumina continuous fiber

Examples

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Embodiment 1

[0033] This embodiment relates to the preparation of a continuous alumina fiber. Firstly, spinnable aluminum sol is prepared, followed by concentration and defoaming, then dry spinning, and finally continuous collection.

[0034] The specific operation process is as follows:

[0035] First, mix pseudo-boehmite and deionized water in a ratio of 2:8 by weight, then add nitric acid in a certain proportion, adjust the pH to 4, stir evenly at room temperature, and then place it in a hydrothermal reaction kettle at a temperature of 100°C , the reaction time is 1h under the condition of pressure 0.5MPa, and the spinnable aluminum sol is prepared. The viscosity of the prepared spinnable aluminum sol is 5mpa·s, the average particle size of the colloid is 35nm, and the particle size distribution is as follows: figure 1 shown;

[0036] Next, the prepared spinnable aluminum sol was concentrated and defoamed, the solid content was controlled at 50%, and the viscosity reached 95pa·s at thi...

Embodiment 2

[0040] Compared with Example 1, only the hydrothermal reaction temperature was changed in the preparation process of the spinnable aluminum sol, and the hydrothermal reaction temperature was controlled to be 120°C. 52nm;

[0041] Then concentrate and defoam the spinnable aluminum sol, control the solid content to 50%, and the viscosity at this time is 132pa·s;

[0042] Finally, dry spinning, control spinning temperature 60°C, spinning pressure 0.5MPa, tunnel temperature 40°C, spinning speed 200m / min, spinneret hole used in dry spinning is 500 holes, hole diameter 0.03mm ; The obtained alumina continuous fiber has a diameter of 22 μm and a continuous spinning length of 1300 m.

Embodiment 3

[0044] Compared with Example 1, only the hydrothermal reaction pressure was changed in the preparation process of the spinnable aluminum sol, and the hydrothermal reaction pressure was controlled at 0.9MPa. 43nm;

[0045] Then concentrate and defoam the spinnable aluminum sol, control the solid content to 50%, and the viscosity at this time is 116pa·s;

[0046] Finally, dry spinning, control spinning temperature 60°C, spinning pressure 0.5MPa, tunnel temperature 40°C, spinning speed 200m / min, spinneret hole used in dry spinning is 500 holes, hole diameter 0.03mm The obtained alumina continuous fiber has a diameter of 20 μm and a continuous spinning length of 1700 m.

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Abstract

The invention discloses a spinnable aluminum sol, its preparation method and alumina continuous fiber, belonging to the technical field of ceramic fiber preparation. The preparation method of the spinnable aluminum sol comprises the following steps: using an inorganic hydroxide-containing compound of aluminum, adding deionized water, and then adding an acid in a certain proportion to adjust the pH so that the pH is controlled at 1-6, stirring evenly at room temperature, and finally Put it in a hydrothermal reaction kettle for hydrothermal reaction to obtain spinnable aluminum sol. The spinnable aluminum sol in the invention has good spinning performance, and avoids the problem of the addition of spinning aids and the resulting holes and cracks in the high-temperature sintering process.

Description

technical field [0001] The invention relates to a technology in the field of ceramic fiber preparation, in particular to a spinnable aluminum sol, a preparation method thereof and continuous alumina fibers. Background technique [0002] As a good high temperature resistant ceramic fiber, alumina fiber has good temperature resistance, high strength, high modulus, good chemical stability, etc. It has been applied in many fields, such as automotive three-way catalytic converter gaskets, aerospace heat-resistant gaskets, aluminum-based composite materials for automotive pistons, overhead wires, combustion chamber throat linings, fairings, tail nozzles, etc. [0003] Alumina sol is the precursor of alumina fiber, and its quality determines the performance of alumina fiber. Especially continuous alumina fiber has strict requirements on the spinnability of alumina sol. [0004] At present, the mainstream methods for preparing alumina fibers are: Bu Neimen method, guided mold meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622B01J13/00D01F9/08
CPCC04B35/10C04B35/62236B01J13/0008D01F9/08
Inventor 杨赛赛吴永龙
Owner 苏州柔陶新材料有限公司
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