Preparation method of yttrium-niobium-copper superconducting material

Abstract

The invention discloses a preparation method of an yttrium-niobium-copper superconducting material. According to the preparation method, niobium powder is added to a nano-carbon conductive fiber material solution, so that coating of the niobium powder with a nano-carbon conductive fiber is achieved, agglomeration is avoided after thermal treatment, the niobium powder can be tightly and uniformly combined, the yttrium-niobium-copper superconducting material has improved conductivity, the obtained product is high in critical transition temperature and good in superconducting property, and the prepared product is simple in process, regular in shape and form, dense in surface, good in connectivity and high in superconducting critical temperature.

Description

technical field

[0001] The invention relates to the field of superconducting materials, in particular to a method for preparing a yttrium-niobium-copper superconducting material. Background technique

[0002] A superconducting material refers to a material that exhibits the properties of zero resistance and repelling magnetic lines of force under certain low temperature conditions. As a kind of superconductor with the highest critical temperature, domestic and foreign scientists have carried out a lot of research on it. At present, this kind of superconductor can realize superconductivity in the liquid nitrogen temperature region, which has the value of practical application. But how Improving its critical parameters, especially the critical temperature Tc, is still the biggest problem in the field of high-temperature superconductivity research.

[0003] The process of synthesizing yttrium-niobium-copper superconducting materials at high temperature is generally complex and...

Examples

Embodiment 1

[0016] Graphite pretreatment, adding sodium fluoride to the nano-graphite powder, adding a metal catalyst, mixing, heating at 600°C under the protection of an inert gas, and controlling the heating time to 10min, fixing sodium fluoride on the surface of the nano-graphite powder .

[0017] Nano-carbon fiber pretreatment, the nano-carbon fiber is oxidized with concentrated sulfuric acid and potassium permanganate mixed acid, after ultrasonic vigorous stirring, the carboxylated nano-carbon fiber is obtained, the surface treatment agent is added, heat treatment at 150 ° C for 10 minutes, and silver is added. Under the protection of a mixed gas of nitrogen and helium, heat at 400° C. for 30 minutes to uniformly disperse the silver in the carbon nanofibers.

[0018] Put pretreated graphite and pretreated nano-carbon fiber in a container, dissolve with 150 parts of isopropanol, then add dispersant, polyphenylene sulfide, PPS resin, blend with a strong mixer, and then use an ultrasoni...

Embodiment 2

[0025] Graphite pretreatment, adding sodium fluoride to the nano-graphite powder, adding a metal catalyst, mixing, heating at 650°C under the protection of an inert gas, and controlling the heating time for 15 minutes, and fixing sodium fluoride on the surface of the nano-graphite powder .

[0026] Nano-carbon fiber pretreatment, the nano-carbon fiber is oxidized with concentrated sulfuric acid and potassium permanganate mixed acid, after ultrasonic vigorous stirring, to obtain carboxylated nano-carbon fiber, add surface treatment agent, heat treatment at 200 ° C for 15 minutes, add silver, in Under the protection of a mixed gas of nitrogen and helium, heat at 450° C. for 45 minutes to uniformly disperse the silver in the carbon nanofibers.

[0027] Put pretreated graphite and pretreated nano-carbon fiber in a container, dissolve with 250 parts of isopropanol, then add dispersant, polyphenylene sulfide, PPS resin, blend with a strong mixer, and then use an ultrasonic disperser...

technical field

[0001] The invention relates to the field of superconducting materials, in particular to a method for preparing a yttrium-niobium-copper superconducting material. Background technique

[0002] A superconducting material refers to a material that exhibits the properties of zero resistance and repelling magnetic lines of force under certain low temperature conditions. As a kind of superconductor with the highest critical temperature, domestic and foreign scientists have carried out a lot of research on it. At present, this kind of superconductor can realize superconductivity in the liquid nitrogen temperature region, which has the value of practical application. But how Improving its critical parameters, especially the critical temperature Tc, is still the biggest problem in the field of high-temperature superconductivity research.

[0003] The process of synthesizing yttrium-niobium-copper superconducting materials at high temperature is generally complex and...

Examples

Embodiment 1

[0016] Graphite pretreatment, adding sodium fluoride to the nano-graphite powder, adding a metal catalyst, mixing, heating at 600°C under the protection of an inert gas, and controlling the heating time to 10min, fixing sodium fluoride on the surface of the nano-graphite powder .

[0017] Nano-carbon fiber pretreatment, the nano-carbon fiber is oxidized with concentrated sulfuric acid and potassium permanganate mixed acid, after ultrasonic vigorous stirring, the carboxylated nano-carbon fiber is obtained, the surface treatment agent is added, heat treatment at 150 ° C for 10 minutes, and silver is added. Under the protection of a mixed gas of nitrogen and helium, heat at 400° C. for 30 minutes to uniformly disperse the silver in the carbon nanofibers.

[0018] Put pretreated graphite and pretreated nano-carbon fiber in a container, dissolve with 150 parts of isopropanol, then add dispersant, polyphenylene sulfide, PPS resin, blend with a strong mixer, and then use an ultrasoni...

Embodiment 2

[0025] Graphite pretreatment, adding sodium fluoride to the nano-graphite powder, adding a metal catalyst, mixing, heating at 650°C under the protection of an inert gas, and controlling the heating time for 15 minutes, and fixing sodium fluoride on the surface of the nano-graphite powder .

[0026] Nano-carbon fiber pretreatment, the nano-carbon fiber is oxidized with concentrated sulfuric acid and potassium permanganate mixed acid, after ultrasonic vigorous stirring, to obtain carboxylated nano-carbon fiber, add surface treatment agent, heat treatment at 200 ° C for 15 minutes, add silver, in Under the protection of a mixed gas of nitrogen and helium, heat at 450° C. for 45 minutes to uniformly disperse the silver in the carbon nanofibers.

[0027] Put pretreated graphite and pretreated nano-carbon fiber in a container, dissolve with 250 parts of isopropanol, then add dispersant, polyphenylene sulfide, PPS resin, blend with a strong mixer, and then use an ultrasonic disperser...