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    • 6. 发明授权
    • Fabrication of high T.sub.C superconducting helical resonator coils
    • 高TC超导螺旋谐振器线圈的制造
    • US5344815A
    • 1994-09-06
    • US875905
    • 1992-04-29
    • Sophia R. SuMargaret O'ConnorScott Butler
    • Sophia R. SuMargaret O'ConnorScott Butler
    • H01L39/24H01L39/12
    • H01L39/248Y10S505/705Y10S505/739Y10S505/74Y10S505/742
    • A method for producing a superconducting copper oxide based helical resonator coil exhibiting improved quality factor, Q. A copper oxide based superconductor powder is mixed with a binder melt at about 45-65% solids by volume. The binder is an RCOOR' ester wax with R and R' each a long chain hydrocarbon group of at least 6 carbons. The ester wax has a melting point of about 40.degree.-100.degree. C. and a viscosity of about 94-2000 centipoise at its melting point. The binder/powder mixture is extruded and wrapped around a mandrel to form a helical coil. The coil is embedded in a setter powder and heated in an oxidizing atmosphere at up to about 2.degree. C./min to about 450.degree.-650.degree. C., and held for a time sufficient to remove the binder. The coil is then heated in the oxidizing atmosphere at up to about 3.degree. C./min to at least about 920.degree. C., and held at about 920.degree.-990.degree. C. for a time sufficient to achieve a density of at least about 93% of theoretical density. The densified coil is cooled in the oxidizing atmosphere at below about 2.degree. C./min to at or below about 550.degree. C., and annealed at about 450-550.degree. C. in flowing oxygen for a time sufficient to convert the crystal structure of the coil to at least 50 v/o high T.sub.c phase superconducting perovskite crystal. The geometry of the extruded, wrapped helical coil is selected to produce, after subsequent densification, a helical resonator coil about 3-17 mm in inner diameter, of a total length n .lambda./2, wherein n is an integer and .lambda. is the operating wavelength of the helical resonator coil.
    • 一种制造出具有改善的品质因数的超导氧化铜基螺旋共振器线圈的方法.Q。将基于氧化铜的超导体粉末与约45-65%体积固体的粘合剂熔体混合。 粘合剂是RCOOR'酯蜡,其中R和R'各自具有至少6个碳的长链烃基。 酯蜡的熔点约为40°-100℃,熔点约为94-2000厘泊。 将粘合剂/粉末混合物挤出并缠绕在心轴上以形成螺旋线圈。 将线圈嵌入固定器粉末中并在高达约2℃/分钟至约450-650℃的氧化气氛中加热,并保持足够的时间以除去粘合剂。 然后将线圈在氧化气氛中以约3℃/分钟加热至至少约920℃,并保持在约920-990℃达一至少达到至少的密度 约93%的理论密度。 致密线圈在氧化气氛中在低于约2℃/分钟下冷却至约550℃或低于约550℃,并在约450-550℃下在流动的氧气中退火足以转化晶体结构的时间 的线圈到至少50v / o的高Tc相超导体钙钛矿晶体。 挤出的包裹的螺旋线圈的几何形状被选择以在随后的致密化之后产生总长度为nλ/ 2的内径约3-17mm的螺旋谐振器线圈,其中n是整数,λ是操作 螺旋谐振器线圈的波长。