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公开(公告)号：US20150270471A1
公开(公告)日：2015-09-24
申请号：US14433986
申请日：2013-10-08
Applicant: NORTH CAROLINA STATE UNIVERSITY
Inventor： Justin Schwartz , Carl C. Koch , Yun Zhang , Xiaotao Liu
CPC classification number: H01L39/248 , B22F5/12 , B22F9/04 , B22F2009/041 , B22F2009/043 , B22F2009/044 , B22F2999/00 , C22C1/0491 , C22C1/1084 , H01L39/2451 , H01L39/2477 , B22F2201/02 , B22F2201/12
Abstract: A BÏ2212 article may be formed by mixing metallic precursor powders including bismuth, strontium, calcium and copper in an oxygen-free atmosphere, mechanically alloying the metallic precursor powders in an oxygen-free atmosphere, and heating the metallic precursor alloy according to a temperature profile. The profile may include a ramp-up stage during which the alloy is heated to a peak temperature in an oxygen-free atmosphere, a dwell stage during which the alloy is held at the peak temperature for a dwell time, and a ramp-down stage during which the alloy is cooled from the peak temperature. During at least a portion of the dwell stage, the oxygen-free atmosphere is switched to an oxygen-inclusive atmosphere, wherein the alloy is oxidized to form a superconducting oxide, which may be sintered during or after oxidation. The alloy may be formed into a shape, such as a wire, prior to oxidizing.
Abstract translation: 可以通过在无氧气氛中混合包括铋，锶，钙和铜的金属前体粉末，在无氧气氛中机械合金化金属前体粉末，并根据温度曲线加热金属前体合金来形成BÏ2212制品 。 该轮廓可以包括加速阶段，在该阶段期间，合金在无氧气氛中被加热至峰值温度，在此期间合金保持在峰值温度下停留时间的停留阶段，以及斜坡下降阶段 在此期间，合金从峰值温度冷却。 在停留阶段的至少一部分期间，将无氧气氛切换到含氧气氛，其中该合金被氧化以形成可在氧化期间或之后烧结的超导氧化物。 在氧化之前，该合金可以形成为诸如电线的形状。
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公开(公告)号：US09773962B2
公开(公告)日：2017-09-26
申请号：US14433986
申请日：2013-10-08
Applicant: NORTH CAROLINA STATE UNIVERSITY
Inventor： Justin Schwartz , Carl C. Koch , Yun Zhang , Xiaotao Liu
CPC classification number: H01L39/248 , B22F5/12 , B22F9/04 , B22F2009/041 , B22F2009/043 , B22F2009/044 , B22F2999/00 , C22C1/0491 , C22C1/1084 , H01L39/2451 , H01L39/2477 , B22F2201/02 , B22F2201/12
Abstract: A BÏ2212 article may be formed by mixing metallic precursor powders including bismuth, strontium, calcium and copper in an oxygen-free atmosphere, mechanically alloying the metallic precursor powders in an oxygen-free atmosphere, and heating the metallic precursor alloy according to a temperature profile. The profile may include a ramp-up stage during which the alloy is heated to a peak temperature in an oxygen-free atmosphere, a dwell stage during which the alloy is held at the peak temperature for a dwell time, and a ramp-down stage during which the alloy is cooled from the peak temperature. During at least a portion of the dwell stage, the oxygen-free atmosphere is switched to an oxygen-inclusive atmosphere, wherein the alloy is oxidized to form a superconducting oxide, which may be sintered during or after oxidation. The alloy may be formed into a shape, such as a wire, prior to oxidizing.
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