Preparation method of high-entropy oxide ceramic fiber material

A technology of oxide ceramics and fiber materials, applied in the field of ceramic fiber materials, to achieve the effects of simple method, reduced energy consumption, and easy stoichiometric ratio

Pending Publication Date: 2021-12-07
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of high-entropy oxide ceramic fiber materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: get cerium nitrate, zirconium nitrate, hafnium nitrate, tin nitrate and titanium nitrate of equimolar mass and place in deionized water, stir and make it dissolve completely, obtain metal nitrate mixed solution, the mole of metal nitrate mixed solution The concentration was 2 mol / L; the viscose fiber was vacuum dipped in the prepared mixed solution, the dipping time was 12 h, and the dipping temperature was 40 °C; 3 times; then put it into a drying oven for drying, the drying temperature is 60 °C, and the drying time is 8 h; after drying, it is placed in a high-temperature electric furnace for heat treatment to obtain high-entropy oxide ceramic fibers. The heat treatment temperature is 1500 °C, and the heat preservation The time is 4h. prepared (Ce 0.2 Zr 0.2 hf 0.2 Sn 0.2 Ti 0.2 )O 2 The high-entropy oxide ceramic fiber material has a uniform morphology, a single-phase fluorite structure, and low thermal conductivity.

Embodiment 2

[0020] Embodiment 2: get zirconium nitrate, hafnium nitrate, cerium nitrate and yttrium nitrate of equimolar mass and place in deionized water, stir and make it dissolve completely, obtain metal nitrate mixed solution, and the molar concentration of metal nitrate mixed solution is 1mol / L; the viscose fiber was vacuum dipped in the prepared mixed solution, the dipping time was 12h, and the dipping temperature was 40°C; after dipping, it was washed with deionized water and centrifuged for 3 times; Then put it into a drying oven for drying, the drying temperature is 60 °C, and the drying time is 8 h; after drying, it is placed in a high-temperature electric furnace for heat treatment to obtain high-entropy oxide ceramic fibers. The heat treatment temperature is 1500 ° C, and the holding time is 2h. . The prepared (Hf 0.25 Zr 0.25 Ce 0.25 Y 0.25 )O 2-δ The morphology of the high-entropy oxide ceramic fiber material is uniform, and the phase structure is a single-phase fluori...

Embodiment 3

[0021] Embodiment 3: get zirconium nitrate, cerium nitrate, tin nitrate and titanium nitrate of equimolar mass and place in deionized water, stir and make it dissolve completely, obtain metal nitrate mixed solution, and the molar concentration of metal nitrate mixed solution is 1mol / L; the viscose fiber was vacuum dipped in the prepared mixed solution, the dipping time was 12h, and the dipping temperature was 40°C; after dipping, it was washed with deionized water and centrifuged for 3 times; Then put it into a drying oven for drying, the drying temperature is 60 °C, and the drying time is 8 h; after drying, it is placed in a high-temperature electric furnace for heat treatment to obtain high-entropy oxide ceramic fibers. The heat treatment temperature is 1500 ° C, and the holding time is 4h. . prepared (Ce 0.25 Zr 0.25 Sn 0.25 Ti 0.25 )O 2 The morphology of the high-entropy oxide ceramic fiber material is uniform, and the phase structure is a single-phase fluorite struc...

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PUM

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Abstract

The invention belongs to the technical field of ceramic fiber materials, and discloses a preparation method of a high-entropy oxide ceramic fiber material. The preparation method comprises the steps: preparing high-entropy oxide ceramic fibers through a template impregnation method, taking viscose as a template, and subjecting the viscose to vacuum impregnation in a metal nitrate mixed solution, wherein metal nitrate in the metal nitrate mixed solution is formed by mixing at least four of cerous nitrate, zirconium nitrate, yttrium nitrate, hafnium nitrate, titanium nitrate and lanthanum nitrate in equal molar mass; and after the impregnation,performing washing, centrifuging, drying and heat treatment to obtain the high-entropy oxide ceramic fiber. According to the preparation method, liquid-phase burdening is adopted, the method can guarantee that multiple metal elements are mixed uniformly, the prepared high-entropy oxide ceramic fiber material is uniform in morphology, the phase structure is of a fluorite type, and the proportion of elements contained in the fiber material is close to equal moles.

Description

technical field [0001] The invention belongs to the technical field of ceramic fiber materials, in particular to a preparation method of a high-entropy oxide ceramic fiber material. Background technique [0002] High-entropy oxides are oxides with a single structure obtained from five or more metal or non-metal oxides in an equimolar or near-molar ratio by mutual solid solution. High-entropy oxides have multiple principal elements and chaotic arrangement between principal elements, have higher entropy value and larger lattice distortion, and are easy to form solid solutions such as rock salt type, fluorite type, spinel type and perovskite type. Therefore, it exhibits excellent properties, such as unique mechanical, electrical and optical properties, and has very broad application prospects in the fields of aerospace, solar cells, photocatalytic materials and nuclear reactors. In recent years, high-entropy oxides have received extensive attention from researchers at home and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49C04B35/50C04B35/622D01F9/08
CPCC04B35/62231C04B35/49C04B35/50D01F9/08C04B2235/443C04B2235/6562C04B2235/6567
Inventor 闫森旺孙小飞王刚张雷李虹屿李红霞
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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