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Preparation method for alumina-zirconia ceramic fiber

A technology of zirconia ceramics and alumina is applied in the field of preparation of alumina-zirconia ceramic fibers, which can solve the problems of high energy consumption and poor compactness of ceramic fibers, and achieves low thermal conductivity, good flexibility, and simple and easy-to-adjust process. Effect

Active Publication Date: 2013-11-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the addition of polymer additives in this method is beneficial to fiber formation, in the heat treatment process, too much organic matter will decompose to form larger pores, making the prepared ceramic fibers poor in density.
[0005] On the other hand, the current preparation method of alumina-zirconia ceramic fiber is to prepare the spinnable sol precursor by reflux at 80-110°C, which consumes relatively high energy in industrial production.

Method used

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  • Preparation method for alumina-zirconia ceramic fiber
  • Preparation method for alumina-zirconia ceramic fiber
  • Preparation method for alumina-zirconia ceramic fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Preparation of sol: add 90mL of formic acid to 480mL of water to make a solution, then add 136g of aluminum isopropoxide and stir to hydrolyze until transparent, then add 75g of zirconium acetate solution, mix well and age in a water bath at 60°C until the viscosity of the sol is 30Pa·s .

[0044] (2) Centrifugal fiber formation: the sol obtained in step (1) is formed into fibers by a centrifugal spinning machine to obtain alumina-zirconia gel fibers. The fiber-forming process conditions are: the diameter of the spinning hole is 0.30mm, the rotation speed of spinning is 3500r / min, and the spinning temperature is 30°C.

[0045] (3) Gel fiber ceramicization: raise the temperature from room temperature to 500°C at a rate of 2°C / min, keep at this temperature for 2 hours, and then increase from 600°C to 950°C at a rate of 5°C / min C, keep warm at this temperature for 2h.

[0046] The resulting fiber is γ-Al 2 o 3 -Tetragonal ZrO 2 Composite ceramic fiber, fiber diame...

Embodiment 2

[0048] (1) Sol preparation: Add 80mL formic acid to 450mL water to make a solution, then add 136g aluminum isopropoxide and stir until transparent, then add 103g zirconium acetate solution, mix well and age in a water bath at 50°C to a sol with a viscosity of 40Pa s .

[0049] (2) Centrifugal fiber formation: the sol obtained in step (1) is formed into fibers by a centrifugal spinning machine to obtain alumina-zirconia gel fibers. The fiber-forming process conditions are: the diameter of the spinning hole is 0.30mm, the rotation speed of spinning is 5000r / min, and the spinning temperature is 35°C.

[0050] (3) Gel fiber ceramicization: raise the temperature from room temperature to 600°C at a heating rate of 1°C / min, and keep at this temperature for 2 hours, and then rise from 600°C to 950°C at a heating rate of 10°C / min C, keep warm at this temperature for 2h.

[0051] The XRD spectrogram of gained ceramic fiber is as figure 1 as shown, image 3 is the SEM photo of the ob...

Embodiment 3

[0053] (1) Preparation of sol: add 70mL of formic acid to 450mL of water to make a solution, then add 136g of aluminum isopropoxide and stir until transparent, then add 154g of zirconium acetate solution, mix well and age in a water bath at 50°C to a sol with a viscosity of 50Pa·s .

[0054] (2) Centrifugal fiber formation: the sol obtained in step (1) is formed into fibers by a centrifugal spinning machine to obtain alumina-zirconia gel fibers. Centrifugal fiber forming, the process conditions are: the diameter of the spinning hole is 0.30mm, the rotation speed of spinning is 5000r / min, and the spinning temperature is 35°C.

[0055] (3) Gel fiber ceramicization: raise the temperature from room temperature to 600°C at a heating rate of 1°C / min, and keep at this temperature for 2 hours, and then rise from 600°C to 950°C at a heating rate of 10°C / min C, keep warm at this temperature for 3h.

[0056] The resulting fiber is γ-Al 2 o 3 -Tetragonal ZrO 2 Composite ceramic fiber...

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Abstract

The invention relates to a preparation method for alumina-zirconia ceramic fiber. The method comprises the following steps: utilizing aluminium isopropoxide, formic acid, zirconium acetate and / or additive to prepare spinnable colloidal sol precursor, adopting a centrifugal fiber forming technology to prepare gel fibre, and then calcining to obtain the alumina-zirconia ceramic fiber with the diameter of 1 to 8 micrometers. The colloidal sol prepared by the invention is stable in framework, cheap in used raw materials, mild in fiber forming condition and simple in preparation process. The calcined ceramic fiber is good in flexibility and low in heat conductivity coefficient, and can be used for high temperature thermal insulation material.

Description

technical field [0001] The invention relates to a preparation method of alumina-zirconia ceramic fiber, which belongs to the field of inorganic non-metallic materials. Background technique [0002] In recent years, with the rapid development of aerospace technology and the need for energy saving and emission reduction, the requirements for thermal insulation materials are getting higher and higher. Among the various existing heat insulation materials, ceramic fiber has become the first choice of heat insulation materials due to its outstanding light weight and high temperature resistance. It has both the high temperature resistance of inorganic materials and the low thermal conductivity and low density of fiber materials. , high heat capacity and various product forms, as a high-temperature insulation material, it has been widely used in various heat protection projects. [0003] Alumina ceramic fibers and zirconia ceramic fibers are the first choice for high temperature in...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/48C04B35/622
Inventor 贾玉娜陈代荣柴鲁宁焦秀玲贾乃涛
Owner SHANDONG UNIV
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