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A kind of preparation method of hollow zirconia fiber

A zirconia fiber and hollow technology, applied in the direction of inorganic raw material artificial filaments, etc., can solve the problems of unfavorable locking air heat insulation performance and large diameter of solid structure, and achieve the effect of improved heat insulation performance and low thermal conductivity

Active Publication Date: 2019-01-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Most of the zirconia fibers prepared by the current method are solid. Although these fibers have good thermal insulation performance when stacked together, their solid structure is not conducive to locking air and obtaining better thermal insulation performance (Chinese patent 200410024264.7)
Although some fibers are hollow fibers, their diameters are relatively large, making it difficult to use them in the field of thermal insulation materials (ZhenS, et al. Fabrication and evaluation of NiO / Y 2 o 3 -stabilized-ZrO 2 hollow fibers for anode-supported micro-tubular solid oxide fuel cells[J].CeramicsInternational,2016,42(7):8559-8564.)

Method used

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  • A kind of preparation method of hollow zirconia fiber
  • A kind of preparation method of hollow zirconia fiber
  • A kind of preparation method of hollow zirconia fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 4.97 g of zirconium oxychloride into 50 ml of deionized water, add 0.47 g of yttrium nitrate stabilizer, and prepare a zirconium oxychloride 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 1000°C in the air at a rate of 3°C / min, and kept warm for 1 hour to prepare hollow zirconia fibers.

[0024] from figure 1 The X-ray diffraction pattern in the figure shows that the hollow zirconia fiber is zirconia mixed with tetragonal phase and cubic phase. figure 2 Shown is a high-magnification photo of the prepared zirconia fiber scanning electron microscope, it can be seen that the fiber is hollow. image 3 Shown is a low-magnification photo of the zirconia fiber scanning electron microscope, and it can be seen that the fiber continuity is good.

Embodiment 2

[0026] Dissolve 0.92 g of zirconium oxychloride into 50 ml of deionized water, and add 0.087 g of yttrium nitrate stabilizer to prepare a zirconium oxychloride 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 the air at a rate of 1°C / min, and kept warm for 1 hour to prepare hollow zirconia fibers.

Embodiment 3

[0028] Dissolve 18.6 g of zirconium oxychloride into 50 ml of deionized water, and add 1.77 g of yttrium nitrate stabilizer to prepare a zirconium oxychloride 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 1800°C in the air at a rate of 10°C / min, and kept warm for 10 hours to prepare hollow zirconia fibers.

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Abstract

The invention discloses a method for preparing hollow zirconium oxide fibers. The method comprises the steps of using hollow kapok fibers as a carrier, proportionally mixing a zirconium salt and a yttrium stabilizer, which serve as raw materials, then, dissolving the mixture in water so as to prepare a solution, submerging the kapok fibers in the solution, carrying out soaking in a vacuum environment, taking out the kapok fibers, baking the kapok fibers, and then, carrying out sintering in an oxygen atmosphere, thereby obtaining the hollow zirconium oxide fibers. The zirconium oxide fibers prepared by the method are of hollow tubular structures; when the fibers are pressed into fiber sheets and are stacked together, air can be divided into smaller spaces, and the flow of the air is more difficult than that in solid fibers during heat transfer, so that the heat-insulating property of the material can be greatly improved. The zirconium oxide fibers are applied to the field of refractory 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 zirconia fibers, in particular to a method for preparing hollow zirconia heat-insulating fibers by using kapok fibers. Background technique [0002] Zirconia (ZrO 2 ) has good chemical stability and thermal stability, excellent high-temperature electrical conductivity, high high-temperature strength and toughness, good corrosion resistance and stability, and is an important raw material for special ceramics that are currently developing rapidly, and can be used to produce high-temperature Structural ceramics, bioceramics and electronic ceramics, etc. Zirconium dioxide also has the characteristics of martensitic phase transformation, which can be used to improve the toughness of ceramic materials and thermal shock stability of refractory materials (Yin Yansheng et al. Zirconia ceramics and their composite materials [M]. Beiji...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08C04B35/48C04B35/622
CPCC04B35/6225C04B2235/3225D01F9/08
Inventor 王天驰余沁堃李金金孔见
Owner NANJING UNIV OF SCI & TECH