Method for preparing yttrium barium copper oxide powder with uniform particle size

A yttrium barium cuprite powder technology is applied in the field of yttrium barium cuprite powder preparation, which can solve the problems of difficult control of chemical composition uniformity, complicated preparation process and high reaction activation energy, and achieves easy control and preparation of chemical composition uniformity. Simple steps and uniform particle size

Inactive Publication Date: 2016-11-23
仇颖莹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: for the preparation of yttrium barium copper oxide powder by the current method, repeated sintering is required, the preparation process is cumbersome, and the reaction activation energy is high, resulting in poor uniformity of the synthesized material, difficulty in controlling the uniformity of the chemical composition, and product particle size. Disadvantages of different paths, providing a way to Y 2 o 3 、BaCO 3 Mix ball milling with CuO, calcined and grind with nano-calcium carbonate to obtain precursor gel for later use, then mix kaolin powder with deionized water to obtain embryo body, after exposure to the sun and glazing, put the spare precursor gel into glazing The inside of the embryo body is frozen after firing, and then the internal yttrium barium copper oxide body is frozen and pressed, mixed with absolute ethanol for ball milling, ultrasonically dispersed and filtered to obtain a filter cake, and dried to obtain a uniform particle size yttrium barium copper oxide powder. In the present invention, carbon dioxide decomposed by calcium carbonate pyrolysis is frozen under high pressure to form dry ice, followed by sublimation and blasting treatment, so that yttrium barium copper oxygen is uniformly dispersed to form yttrium barium copper oxygen powder with uniform particle size. The preparation steps of the present invention are simple and do not need to be repeated Sintering, the uniformity of the obtained product is good, which effectively solves the problem that the uniformity of the chemical composition is difficult to control and the particle size of the product is different

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] First, according to the Y:Ba:Cu molar ratio of 1:2:3, the Y 2 o 3 、BaCO 3 Stir and mix with CuO and place in a ball milling tank. After ball milling for 2 hours, put it in a tube furnace and calcinate at 850°C for 10 hours. After the calcination is completed, let it stand and cool to room temperature to prepare a mixed calcined powder; then In parts by weight, weigh 25 parts of nano-calcium carbonate, 40 parts of the mixed calcined powder prepared above, 15 parts of absolute ethanol and 5 parts of ethylene glycol in a mortar, grind at 250r / min for 1h, and prepare Precursor gel, ready for use; then according to the mass ratio of 1:5, kaolin powder and deionized water were mixed and placed in a mold, pressed and dried, and a kaolin embryo with a thickness of 5mm and a 50mm round hole at the bottom was prepared Then put it in the sun for 2 days, glaze the green body and dry it to prepare the glazed green body; then put the prepared precursor gel inside the glazed green b...

example 2

[0018] First, according to the Y:Ba:Cu molar ratio of 1:2:3, the Y 2 o 3 、BaCO 3 Stir and mix with CuO and place in a ball milling tank. After ball milling for 3 hours, place it in a tube furnace and calcinate at 875°C for 11 hours. After the calcination is completed, let it stand and cool to room temperature to prepare a mixed calcined powder; then In terms of parts by weight, weigh 28 parts of nano-calcium carbonate, 50 parts of the mixed calcined powder prepared above, 20 parts of absolute ethanol and 8 parts of ethylene glycol in a mortar, grind for 2 hours at 275r / min, and prepare Precursor gel, ready for use; then according to the mass ratio of 1:5, kaolin powder and deionized water were mixed and placed in a mold, pressed and dried, and a kaolin embryo with a thickness of 5mm and a 50mm round hole at the bottom was prepared Then put it in the sun for 3 days, glaze the green body and dry it to prepare the glazed green body; then put the prepared precursor gel inside th...

example 3

[0020] First, according to the Y:Ba:Cu molar ratio of 1:2:3, the Y 2 o 3 、BaCO 3 Stir and mix with CuO and place in a ball milling tank. After ball milling for 3 hours, place it in a tube furnace and calcinate at 900°C for 12 hours. After the calcination is completed, let it stand and cool to room temperature to prepare a mixed calcined powder; then In parts by weight, weigh 30 parts of nano-calcium carbonate, 60 parts of the above-prepared mixed calcined powder, 25 parts of absolute ethanol and 10 parts of ethylene glycol in a mortar, grind for 2 hours at 300 r / min, and prepare Precursor gel, ready for use; then according to the mass ratio of 1:5, kaolin powder and deionized water were mixed and placed in a mold, pressed and dried, and a kaolin embryo with a thickness of 5mm and a 50mm round hole at the bottom was prepared Then put it in the sun for 3 days, glaze the green body and dry it to prepare the glazed green body; then put the prepared precursor gel inside the glaze...

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Abstract

The invention discloses a method for preparing yttrium barium copper oxide powder with uniform particle size, and belongs to the technical field of preparation of yttrium barium copper oxide powder. The present invention will Y 2 o 3 、BaCO 3 Mix ball milling with CuO, calcined and grind with nano-calcium carbonate to obtain precursor gel for later use, then mix kaolin powder with deionized water to obtain embryo body, after exposure to the sun and glazing, put the spare precursor gel into glazing The inside of the embryo body is frozen after firing, and then the internal yttrium barium copper oxide body is frozen and pressed, mixed with absolute ethanol for ball milling, ultrasonically dispersed and filtered to obtain a filter cake, and dried to obtain a uniform particle size yttrium barium copper oxide powder. The beneficial effects of the invention are: the preparation steps of the invention are simple, no repeated sintering is required, and the obtained product has good uniformity; the uniformity of the chemical composition is easy to control during the preparation process, and the particle size of the product is uniform.

Description

technical field [0001] The invention relates to a method for preparing yttrium barium copper oxide powder with uniform particle size, and belongs to the technical field of preparation of yttrium barium copper oxide powder. Background technique [0002] Yttrium barium copper oxide can be used as a magnet in nuclear magnetic resonance imaging, magnetic levitation facilities and Josephson junctions. It is the first discovered high-temperature superconductor that can work in the liquid nitrogen temperature range. The fineness of Y particles and the uniformity of single-phase precursor powder are the key to the preparation of high-performance YBCO. The uniformity and purity of BCO powder directly affect the superconductivity of the final sample. There are two main problems that limit the application of YBCO in superconductivity: First, the critical current density of YBCO single crystal is very high, while that of polycrystal is very low (only a small current can pass through whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/45C04B35/63
CPCC04B35/626C04B35/4508C04B35/6264C04B35/6303C04B2235/3215C04B2235/3225
Inventor 仇颖莹盛海丰高玉刚
Owner 仇颖莹
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