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Flexible alumina ceramic fiber and preparation method thereof

A technology of alumina ceramics and ceramic fibers, which is applied in the field of fiber materials and can solve problems such as low strength

Active Publication Date: 2011-08-31
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Electrospinning technology was initially used to prepare polymer nanofibers (see: Compos.Sci.Technol.2003, 63, 2223), and gradually developed into nanostructured fibers such as ceramics / metal oxides, which have received increasing attention. For the preparation of α-Al 2 o 3 Nanostructured fibers have been reported (see: Appl.Surf.Sci.2008, 254, 4925), but these α-Al 2 o 3 Fibers are rigid, porous, and low in strength, while flexible α-Al 2 o 3 Ceramic fiber has not been reported yet

Method used

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  • Flexible alumina ceramic fiber and preparation method thereof
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  • Flexible alumina ceramic fiber and preparation method thereof

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Embodiment Construction

[0008] A flexible α-Al 2 o 3 Ceramic fiber, characterized in that the basic structural unit of the fiber is α-Al of 10-40nm 2 o 3 Nanoparticles and 20-30nm thick α-Al 2 o 3 Nano sheet, the fiber diameter is 350-800nm.

[0009] The molar ratio of aluminum to silicon in the fiber is 1:0.004˜1:0.031.

[0010] A flexible α-Al 2 o 3 The preparation method of ceramic fiber comprises steps as follows:

[0011] (1) Add aluminum chloride to the dissolved amount of deionized water, stir until completely dissolved, add tetraethyl orthosilicate (TEOS), stir for 10-15 minutes, then add aluminum isopropoxide and absolute ethanol, and finally Add glacial acetic acid and hydrochloric acid to adjust the pH value to 1.8-2.5, stir until the solution is clear, add polyvinylpyrrolidone (PVP), and stir until the PVP is completely dissolved to obtain a sol spinning solution. in,

[0012] The molar ratio of aluminum chloride to aluminum isopropoxide is 1:3 to 1:5, the molar ratio of the tot...

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Abstract

The invention relates to a flexible alumina ceramic fiber and a preparation method thereof. Basic structural units of the alumina ceramic fiber are alpha-Al2O3 nano particles of which the particle diameter is 10-40nm and alpha-Al2O3 nano plates which are 20-30nm thick, and the diameter of the fiber is 350-800nm. The preparation method comprises the following steps: preparing a spinning fluid by asol-gel method; preparing a gel fiber by an electrostatic spinning technology; and carrying out two-stage calcination to obtain the alpha-Al2O3 ceramic fiber. The fiber is uniform and continuous, is difficult to break, has favorable flexibility, good thermal stability and excellent mechanical property, can be used as a high-temperature catalyst carrier and high-temperature insulating material, and can also be used as an infrared radiation material and sealing material. Besides, the process provided by the invention has the advantages of simple equipment and high operability, thereby being applicable to large-scale production.

Description

technical field [0001] The invention relates to the preparation of flexible inorganic oxide ceramic fibers, in particular to a method for preparing flexible alumina ceramic fibers, and belongs to the technical field of fiber materials. Background technique [0002] Alumina (Al 2 o 3 ) Ceramic fibers have high modulus, high chemical stability, low thermal conductivity and high temperature resistance, and can be used as high temperature insulation materials, high temperature catalyst carriers, reinforcing components of ceramics, metals and plastics, etc., in industry and There are important applications in aviation and aerospace fields (see: Weapon Materials Science and Engineering 2001, 24, 70). Developed countries attach great importance to the research and development of alumina fibers, and have developed a variety of preparation processes and technologies including sol-gel method, slurry method, buinmen method, impregnation method and melt spinning method (see: new chemi...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 陈代荣贾玉娜焦秀玲
Owner SHANDONG UNIV
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