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PRODUCTION OF YTTRIUM-BASED SUPERCONDUCTOR BY GROWTH OF ORIENTATED GRAIN
PRODUCTION OF YTTRIUM-BASED SUPERCONDUCTOR BY GROWTH OF ORIENTATED GRAIN
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机译:定向晶粒的生长生产基于钇的超导体
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摘要
PROBLEM TO BE SOLVED: To improve superconucting characteristics, capable of utilizing strain induced orientated grain growth phenomena, controlling impurity formation, improving high current density and processability, by pressurizing a polycrystal of a specific yttrium-based superconductor. ;SOLUTION: In this yttrium-based superconductor, in order to prepare a polycrystal (finely crystal particle dense sintered compact, chemical formula Ba2YCu3CO7-y) densified into ≥95% theoretical density, having ≤1μm particle diameter of constituent crystal particles, spray dried powder (0.05μm particle diameter) is molded, sintered at 750°C under 1,000atm by HIP, pressurized by 10MPa maximum stress at 870-930°C and at 1MPa/h stress applying rate under ≥2MPa uniaxial stress (compression or tensile) to carry out orientated grain growth treatment to obtain a highly orientated texture of plate particles having approximately a uniform plane (ab), 10-20μm major axis diameter and 2-3μm minor axis diameter. Then the compact is subjected to post-annealing treatment (at 90°C by no load under 1 atmospheric pressure oxygen at 500°C for 40 hours) in a tress released state.;COPYRIGHT: (C)1997,JPO
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机译:要解决的问题:通过加压特定钇基超导体的多晶,可以改善超加工特性,能够利用应变诱导的晶粒长大现象,控制杂质形成,提高高电流密度和可加工性。 ;解决方案:在这种基于钇的超导体中,为了制备多晶(细晶颗粒致密烧结体,化学式为Ba 2 Sub> YCu 3 Sub> CO 7- y Sub>)致密化为理论密度≥95%,组成晶体粒径≤1μm,成型喷雾干燥粉末(0.05μm粒径),通过HIP在750°C,1,000atm下烧结,加压10MPa在≥2MPa单轴应力(压缩或拉伸)下,在870-930°C和1MPa / h的应力施加速率下施加最大应力,以进行定向晶粒生长处理,以获得具有近似均匀平面的板状颗粒的高度定向织构(ab) ,长轴直径为10-20μm,短轴直径为2-3μm。然后将压块在发束释放状态下进行后退火处理(在90°C下在1个大气压氧气下于500°C下空载40小时);版权:(C)1997,JPO
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