Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of hollow alumina fiber

An alumina fiber and hollow technology, which is applied in the preparation of hollow alumina fibers and the field of preparing hollow alumina heat insulation fibers by using kapok fibers, can solve the problems of hindering heat conduction, affecting the heat insulation performance of fibers, adverse heat insulation performance, etc. , to achieve the effect of low thermal conductivity and improved thermal insulation performance

Active Publication Date: 2019-01-11
NANJING UNIV OF SCI & TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the currently used alumina fibers are solid fibers, such as the alumina fibers prepared by the solution spraying method. Performance Research, Functional Materials [M] 2014(13))
The alumina prepared by Li Meng et al. using the sol-gel method is also a solid fiber. After the fibers are piled up, it will indeed have relatively good thermal insulation performance, but relatively speaking, the solid structure is not conducive to the improvement of thermal insulation performance (Li Meng et al. , Research on alumina fiber prepared by sol-gel method[J]. Rare Metal Materials and Engineering, 2012(s3))

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of hollow alumina fiber
  • A kind of preparation method of hollow alumina fiber
  • A kind of preparation method of hollow alumina fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 0.922g of aluminum chloride hexahydrate into 50mL of deionized water to prepare an aluminum chloride impregnation solution. Immerse the kapok fiber in the above solution, put it in a vacuum box and use a vacuum pump to evacuate to -0.1MPa, soak for 6 hours, take it out and dry it. The dried kapok fibers were raised to 600°C in air at a rate of 1°C / min to prepare hollow alumina fibers.

[0026] From figure 1 The X-ray diffraction pattern shows that the prepared hollow alumina fiber is γ-Al 2 o 3 . figure 2 The high-magnification photo of the hollow alumina fiber obtained by scanning electron microscopy shows that the fiber is hollow. image 3 It is a low-magnification photo of the alumina fiber scanning electron microscope, and it can be seen that the fiber has a certain continuity.

Embodiment 2

[0028] Dissolve 4.98 g of aluminum chloride hexahydrate into 50 mL of deionized water, add 0.41 g of zirconium oxychloride as a toughening agent, and prepare an aluminum chloride impregnation solution. Immerse the kapok fiber in the above solution, put it in a vacuum box and use a vacuum pump to evacuate to -0.1MPa, soak for 1 hour, take it out and dry it. The dried kapok fibers were raised to 1000°C in the air at a rate of 3°C / min, and kept warm for 1 hour to prepare hollow alumina fibers.

[0029] From Figure 4 The X-ray diffraction pattern shows that the hollow alumina fiber is γ-Al 2 o 3 and t-ZrO 2 . Figure 5 Shown is a high-magnification photo of the prepared hollow alumina fiber with a scanning electron microscope, and it can be seen that the fiber is hollow. Figure 6 Shown is a low-magnification scanning electron microscope photo of hollow alumina fibers, and it can be seen that the fiber continuity is good.

Embodiment 3

[0031] Dissolve 18.66g of aluminum chloride into 50mL of deionized water to prepare an aluminum chloride solution. Immerse the kapok fiber in the above solution, put it in a vacuum box and use a vacuum pump to evacuate to -0.1MPa, soak for 6 hours, take it out and dry it. The dried kapok fibers were raised to 1800°C in the air at a rate of 10°C / min, and kept warm for 10 hours to prepare hollow alumina fibers.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
diameteraaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method for a hollow aluminum oxide fiber. A hollow kapok fiber is used as a carrier, the kapok fiber is soaked into a water-soluble aluminum salt solution or zirconium oxychloride-containing water-soluble aluminum salt solution, and the kapok fiber is taken out and then is sintered in oxygen atmosphere, so that the hollow aluminum oxide fiber is obtained. The aluminum oxide fiber prepared according to the method disclosed by the invention is hollow and has the characteristics of low density, high hollow degree, excellent heat-insulating performance, and the like. After the hollow aluminum oxide fibers are stacked together, air can be divided into smaller spaces; and in a heat transfer process, air flow in the hollow fiber is more difficult than in a solid fiber, so that the heat-insulating performance of the material can be greatly increased, and thus the hollow aluminum oxide fiber can be applied to the field of fire-proof materials.

Description

technical field [0001] The invention belongs to the field of fire-resistant and heat-insulating materials, and relates to a method for preparing hollow alumina fibers, in particular to a method for preparing hollow alumina heat-insulating fibers by using kapok fibers. Background technique [0002] In addition to the advantages of high strength, high modulus, low thermal conductivity, low thermal expansion coefficient, chemical corrosion resistance, extraordinary heat resistance, and high temperature oxidation resistance of ordinary ceramic fibers, alumina fibers also have low raw material costs. , simple production process, etc., have high cost performance and commercial value, and are widely used in the fields of industrial, military, and civilian composite materials. By controlling the different processes of alumina fiber production, high-performance fiber products with different properties and suitable for different applications can be obtained. [0003] Since zirconia w...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08C04B35/10C04B35/622
CPCC04B35/62236C04B2235/3244D01F9/08
Inventor 王天驰余沁堃李金金孔见
Owner NANJING UNIV OF SCI & TECH