High temperature superconducting material, and preparation method thereof

Abstract

The invention discloses a high temperature superconducting material, and a preparation method thereof. the general chemical formula of the high temperature superconducting material is Ti<z>-(Cu<0.5>Ti<0.5>)Ba<2>(Ca<2-x>Ti<x>)CuO<10-y>, wherein x ranges from 0.25 to 1.0, y ranges from 1.0 to 9.0, and z ranges from 2 to 8. The high temperature superconducting material is high in superconductive critical temperature, critical magnetic field intensity, and superconductive critical current intensity. The preparation method is simple; the adopted raw materials are cheap; quartz mortar is taken as anintermedium, full uniforming is adopted, and two times of high temperature baking are adopted, so that sample dispersibility is improved, and powder with a uniform particle size is obtained; pressinginto sheet materials is carried out using a tablet pressing machine so as to obtain the high temperature superconducting material; an additive is added into quartz mortar, so that the viscosity of the quartz mortar is reduced, and more uniform mixing of the high temperature superconducting material is achieved; at the same time, quartz mortar is capable of realizing more comprehensive contact ofBa(NO3)2, Ca(NO3)2, TiO2, and Cu(CN); the quartz mortar is subjected to baking in a tubular furnace at oxygen atmosphere at 800 to 900 DEG C, the quartz mortar is taken as a combustion improver, and combustion reaction of Ba(NO3)2, Ca(NO3)2, TiO2, and Cu(CN) is accelerated.

Description

technical field [0001] The invention belongs to the field of superconductivity, and in particular relates to a high-temperature superconducting material and a preparation method thereof. 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. It has been found that 28 kinds of elements and thousands of alloys and compounds can become superconductors. [0003] The technical principle of superconducting materials is as follows: [0004] 1) Zero resistance: [0005] In the superconducting state, superconducting materials have zero electrical resistance and can transmit electrical energy without loss. If a magnetic field is used to induce a current in the superconducting loop, this current can be maintained without decay. This "persistent current" has been observed experimentally many times. [0006] 2) Antimagnetic: [0007]...

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Problems solved by technology

[0018] 1. Although traditional alloy superconducting materials have high superconducting critical current and mechanical properties, their superconducting critical temperature is too low and the upper critical magnetic field is not large enough, which greatly limits their application range; such as Nb 3 The Tc temperature of Sn is generally lower than 23K, and the Tc temperature of Nb 3 The upper critical magnetic field of Sn is generally less than 20T;

[0019] 2. Copper oxide high-temperature superconducting materials, although the superconducting critical temperature is very high, and the upper critical magnetic field is also large, but due to the weak pinning force of the magnetic flux, the superconducting critical current under the magnetic field is very low, and its practical application is the same Subject to greater restrictions; such as YBa 2 Cu 3 o 7 The temperature Tc is at 30K, YBa 2 Cu 3 o 7 The upper critical magnetic field is about 30T, but the magnetic flux pinning force is weak, and the superconducting critical current under the magnetic field is low;

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