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Porous pyrochlore ceramic composite material and preparation method thereof

A ceramic composite material and composite material technology, applied in the field of porous pyrochlore ceramic composite material and its preparation, can solve the problems of inability to meet large-scale promotion, high energy and equipment requirements, uneven microstructure, etc., and achieve shortened sintering The effect of time, solving high requirements for personnel and equipment, and reducing process complexity

Active Publication Date: 2019-04-26
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is relatively complicated, the high temperature sintering temperature is high, the time is long, and the requirements for energy and equipment are high.
The as-prepared composites are free of porosity and have an inhomogeneous microstructure with a large number of defects
[0006] In the prior art, the paper Applied Surface Science 459 (2018) 468-476 discloses a preparation method of a porous pyrochlore ceramic composite material, which mainly adopts a chemical co-precipitation method followed by high-temperature sintering at 1350°C, which includes The process of ball milling, spray drying, sintering and plasma treatment, etc., the overall preparation method is complex, and there are quite high requirements for raw materials, instruments, and experimenters, and the sintering temperature is high (1350 ° C), and the output is low, which cannot meet large-scale promotion requirements

Method used

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  • Porous pyrochlore ceramic composite material and preparation method thereof
  • Porous pyrochlore ceramic composite material and preparation method thereof
  • Porous pyrochlore ceramic composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The first step is to prepare amorphous alloy thin strips

[0032] Select high-purity Y, Ti, Co and Al metals as raw materials, the mass purity of the four elements is 99.99wt%, and then according to the target composition Y 28 Ti 28 co 20 al 24 Weigh each component element and prepare a total of 6g of raw materials. The numbers in the marked components are atomic percentages; place the configured 6g of metal raw materials in a vacuum electric arc furnace, and evacuate until the air pressure is 3.0×10 -3 Pa, filled with argon (volume purity of 99.99%), the pressure of argon is 3 × 10 -2 Start arc melting under the condition of MPa, the melting current is 100A, repeat the melting 3 times, each time for 30s, to ensure the uniformity of the alloy structure, and obtain Y 28 Ti 28 co 20 al 24 Master alloy ingot; take 3g of master alloy ingot and carry out induction melting under the protection of high-purity argon (volume purity 99.99%), and the vacuum degree in the fu...

Embodiment 2

[0039] The first step is to prepare amorphous alloy thin strips

[0040] Select high-purity Y, Ti, Co and Al metals as raw materials, the mass purity of the four elements is 99.99wt%, and then according to the target composition Y 28 Ti 28 co 20 al 24 Weigh each component element, prepare a total of 6g of raw materials, and the marked components are atomic percentages; place the configured 6g of metal raw materials in a vacuum electric arc furnace, and evacuate until the air pressure is 3.0×10 -3 Pa, filled with argon (volume purity of 99.99%), the pressure of argon is 3 × 10 -2 Start arc melting under the condition of MPa, the melting current is 70A, and repeat the melting 4 times, each time for 25s, to ensure the uniformity of the alloy structure. After cooling with the furnace, Y 28 Ti 28 co 20 al 24 Master alloy ingot; take 3g of master alloy ingot and carry out induction melting under the protection of high-purity argon (volume purity 99.99%), and the vacuum degree...

Embodiment 3

[0047] The first step is to prepare amorphous alloy thin strips

[0048] Select high-purity Y, Ti, Co and Al metals as raw materials, the mass purity of the four elements is 99.99wt%, and then according to the target composition Y 28 Ti 28 co 20 al 24 Weigh each component element, prepare a total of 6g of raw materials, and the marked components are atomic percentages; place the configured 6g of metal raw materials in a vacuum electric arc furnace, and evacuate until the air pressure is 3.0×10 -3 Pa, filled with argon (volume purity of 99.99%), the pressure of argon is 3 × 10 -2 Under the condition of MPa, the arc melting was started, the melting current was 90A, and the melting was repeated twice, 20s each time, to ensure the uniformity of the alloy structure, and Y was obtained after cooling with the furnace. 28 Ti 28 co 20 al 24 Master alloy ingot; take 3g of master alloy ingot and carry out induction melting under the protection of high-purity argon (volume purity 9...

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Abstract

The invention discloses a porous pyrochlore ceramic composite material and a preparation method of the porous pyrochlore ceramic composite material. The porous pyrochlore ceramic composite material comprises Y2Ti2O7 pyrochlore and CoAl2O4, a porous structure comprises a porous skeleton of 309-502 nm and a porous channel of 188-323 nm, the specific surface area ranges between 45.24 m<2> / g and 53.12m<2> / g; the preparation method combines the rapid solidification technique, the dealloying technique and the high-temperature sintering method, and a dealloying product (stacked amorphous nanosphere)is sintered at the high temperature to obtain the porous pyrochlore ceramic composite material with even ingredients. The porous pyrochlore ceramic composite material is simple and efficient, and solves the problems of high requirement on staffs and equipment, complicated process, high sintering temperature, high energy consumption, long production cycle, low yield, zero or low porosity of a sample in the prior art.

Description

technical field [0001] The invention relates to the field of pyrochlore ceramic materials, in particular to a porous pyrochlore ceramic composite material and a preparation method thereof. Background technique [0002] Pyrochlore is an oxidized mineral with good physical and chemical properties, such as good stability, corrosion resistance, high temperature resistance and high hardness. In recent decades, a lot of research has been done on the pyrochlore system, such as magnetism, ionic conductivity, radiation resistance factor, catalytic performance, optical properties and electrical properties. Among them, in A 2 B 2 o 7 Many peculiar electrical properties and phenomena have been observed in pyrochlore oxides, such as superconductivity, magnetoresistance effect, abnormal Hall effect, etc. due to A 2 B 2 o 7 Type pyrochlore material has a series of special properties, but the current preparation process is very complicated, which greatly restricts the functional appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/462C04B35/64C22C45/00C22C3/00
CPCC22C3/00C22C45/00C04B35/462C04B35/64C04B38/00C04B2235/6567C04B2235/3217C04B2235/3225C04B2235/3275C22C1/11C04B38/0054
Inventor 王志峰李永艳朱墨闫永辉张山秦春玲
Owner HEBEI UNIV OF TECH
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