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A kind of porous pyrochlore ceramic composite material and preparation method thereof

A ceramic composite material and a composite material technology are applied in the field of porous pyrochlore ceramic composite materials and their preparation, which can solve the problems of inability to meet large-scale promotion, high energy and equipment requirements, uneven microstructure, etc., and achieve shortened sintering. effect of time, reduced process complexity, and reduced cost of commercialization

Active Publication Date: 2021-04-20
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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  • A kind of porous pyrochlore ceramic composite material and preparation method thereof
  • A kind of porous pyrochlore ceramic composite material and preparation method thereof
  • A kind of porous pyrochlore ceramic composite material and preparation method thereof

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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 relates to a porous pyrochlore ceramic composite material and a preparation method thereof. The porous pyrochlore ceramic composite is composed of Y 2 Ti 2 o 7 Pyrochlore and CoAl 2 o 4 Its porous structure is composed of a porous framework with a width of 309-502nm and pores with a diameter of 188-323nm, and its specific surface area is 45.24m 2 / g~53.12m 2 / g; The preparation method combines rapid solidification technology, dealloying technology and high-temperature sintering method, and realizes porous pyrochlore ceramic composite material with uniform composition obtained by high-temperature sintering of dealloyed products (stacked amorphous nanospheres). The invention is simple and efficient, and solves the shortcomings of the prior art, such as high requirements on personnel and equipment, complex process, high sintering temperature, high energy consumption, long production cycle, low output, no pores or low porosity of samples.

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 Patents(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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