Method for obtaining hollow zirconia fiber by microwave sintering of Metaplexis japonica (Thunb.) Makino. fiber

A zirconia fiber, microwave sintering technology, applied in the chemical characteristics of fibers, textiles and papermaking, inorganic raw material rayon, etc., can solve the problems of low sintering efficiency, difficult to prepare hollow fibers, etc., to improve the thermal insulation performance and speed up the reaction process. , good continuity

Inactive Publication Date: 2018-09-11
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems that the hollow fiber is difficult to prepare and the sintering efficiency is low, the present invention provides a method for obtaining hollow zirconia fiber by using microwave sintering dill fiber

Method used

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  • Method for obtaining hollow zirconia fiber by microwave sintering of Metaplexis japonica (Thunb.) Makino. fiber
  • Method for obtaining hollow zirconia fiber by microwave sintering of Metaplexis japonica (Thunb.) Makino. fiber
  • Method for obtaining hollow zirconia fiber by microwave sintering of Metaplexis japonica (Thunb.) Makino. fiber

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Embodiment 1

[0034] Get 4.41g of zirconium oxychloride octahydrate and dissolve it in 20ml of 50% ethanol aqueous solution by volume fraction, add 0.42g of yttrium nitrate hexahydrate stabilizer and 1g of zinc bromide microwave sintering aid, and prepare a 10% oxygen Zirconium chloride precursor solution. Immerse the radish fiber in the above solution for 10 minutes, then take it out and dry it; place the dried precursor fiber in a microwave oven with a microwave frequency of 2.45 GHz, and heat it with a power of 700 W for 10 minutes to prepare a hollow zirconia fiber. From figure 1 The X-ray diffraction pattern in the material shows that the cubic phase of the material is zirconia. 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, and there are tubular micropores inside the fiber, and its porosity is greatly improved compared with the solid fiber. image 3 Shown is a low-magnification photo...

Embodiment 2

[0036] Dissolve 1.99g of zirconium oxychloride octahydrate into 20ml of 50% ethanol aqueous solution by volume fraction, add 0.22g of calcium chloride dihydrate stabilizer and 0.5g of zinc bromide microwave sintering aid, and prepare a mass fraction of 5% zirconium oxychloride precursor solution. Immerse the radish fiber in the above solution for 10 minutes, then take it out and dry it; put the dried precursor fiber in a microwave oven with a microwave frequency of 2.45 GHz, and heat it with a power of 700 W for 5 minutes to prepare a hollow zirconia fiber. Figure 4 Shown is a high-magnification photo of the prepared zirconia fiber scanning electron microscope, it can be seen that the fiber is hollow, and there are tubular micropores inside the fiber, and its porosity is greatly improved compared with the solid fiber. Figure 5 Shown is a low-magnification photo of the zirconia fiber scanning electron microscope. It can be seen that the fibers are interlaced and have good con...

Embodiment 3

[0038] Get 7.44g of zirconium oxychloride octahydrate and dissolve it in 20ml of 50% ethanol aqueous solution by volume fraction, add 1.5g of cerium nitrate hexahydrate stabilizer and 1.5g of zinc bromide microwave sintering aid, and prepare 15% of Zirconium oxychloride precursor solution. Immerse the radish fiber in the above solution for 10 minutes, then take it out and dry it; place the dried precursor fiber in a microwave oven with a microwave frequency of 2.45 GHz, and heat it with a power of 700 W for 20 minutes to prepare a hollow zirconia fiber. Figure 6 Shown is a high-magnification photo of the prepared zirconia fiber scanning electron microscope, it can be seen that the fiber is hollow, and there are tubular micropores inside the fiber, and its porosity is greatly improved compared with the solid fiber. Figure 7 Shown is a low-magnification photo of the zirconia fiber scanning electron microscope. It can be seen that the fibers are interlaced and have good continu...

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Abstract

The invention discloses a method for obtaining hollow zirconia fiber by microwave sintering of Metaplexis japonica (Thunb.) Makino. fiber, comprising the following steps: mixing zircon salt, a stabilizing agent and a microwave sintering aid in proportion and dissolving the mixture in a 50% (by volume) of an ethanol aqueous solution, immersing Metaplexis japonica (Thunb.) Makino. fiber in the solution for a certain period of time and taking the Metaplexis japonica (Thunb.) Makino. fiber out and drying; and placing the dried Metaplexis japonica (Thunb.) Makino. fiber into a microwave oven and carrying out aerobic sintering so as to obtain the hollow zirconia fiber. The prepared zirconia fiber is in a hollow tube shape. The structure can help limit transfer of a hot fluid in a fiber product,and heat insulation performance can be greatly raised. The zirconia fiber prepared from Metaplexis japonica (Thunb.) Makino. template has good toughness. There is a certain gap between fibers, and thefiber has high degree of hollowness. In comparison with a traditional microwave sintering mode, the invention has the following advantages: heating rate of microwave sintering of zirconia is raised by the addition of the microwave sintering aid, the microwave sintering apparatus is simplified, the disadvantage that zirconia has poor wave absorbing capacity at low temperature and heating is slow is overcome, sintering time is shortened and energy consumption is lowered, and efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of fire-resistant and heat-insulating materials, and in particular relates to a method for obtaining hollow zirconia fibers by sintering radish fibers with microwaves. Background technique [0002] With the development of industry, people's demand for high-performance high-temperature-resistant heat insulation materials is increasing, and the requirements for heat insulation and stability of heat insulation materials are increasing day by day. Common high-temperature insulation materials are mainly metal oxides, among which zirconia (ZrO 2 ) Ceramics have the advantages of high strength, good stability, low thermal conductivity, and chemical corrosion resistance, and their fiber products are widely used in high-temperature fields (Liu Shuxin, Wang Haibin, Research Progress in Zirconia and Doped Zirconia, Refractory Materials, 2011, 45 (3), 209-213). The stabilized zirconia ceramic fiber has good toughness. There are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/10D01F9/08
CPCD01F9/08D01F9/10
Inventor 王天驰张梓豪戴生伢戴长昊李琪李宜聪
Owner NANJING UNIV OF SCI & TECH
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