Study on the Improvement of Superconductor by CO_2 Laser Irradiation

CO_2激光辐照改进超导体的研究

• 批准号: 03650112
• 负责人: HASEGAWA Motoyoshi
• 金额: $ 1.34万
• 依托单位: Himeji Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650112/
• 关键词: Superconductor; Y-Ba-Cu-O; Bi-Sr-Ca-Cu-O; CO_2 Laser Irradiation; Critical Temperature; Critical Current Density; YーBaーCuーO; CO_2レ-ザ加工; 高性改質

Results that CO_2 laser irradiation was carried out to Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O superconductors are summarized as follows.1) Y-Ba-Cu-O superconductorThe critical temperature (Tc) of the reference sample which was sintered for eight hours is 90.1 K.(1) Critical temperature was generally decreased as a sintering time of the superconductor was shortened. However, after only two minutes laser irradiation, 92 K of maximum critical temperature could be obtained from the material which was sintered for only one hour. This optimized irradiation condition was found out to be 40 W of laser power and 22 Hz of scanning frequency.(2) In order to raise a critical current density, optimum irradiation condition was 60 W and 42 Hz of scanning frequency.2) Bi-Sr-Ca-Cu-O superconductorThe following results were found out after two minutes laser irradiation to the reference sample (Tc=94.5 K) which was sintered for 50 hours.(1) Critical temperature showed a similar tendency to the Y-Ba-Cu-O superconductor. 102.4 K of maximum critical temperature could be obtained in the condition of 20 W of laser power and 22 Hz of scanning frequency.(2) Critical current density showed maximum value in the 80 W of laser power and 62 Hz of scanning frequency. Comparing the reference sample, the high improvement in physical properties was observed after only two minutes laser irradiation.(3) It was confirmed that the volume percentage was improved from 69.9 % to 84.3 % in the condition of 80 W of laser power and 62 Hz of scanning frequency.

对Y-Ba-Cu-O和Bi-Sr-Ca-Cu-O超导体进行CO_2激光照射的结果总结如下： 1) Y-Ba-Cu-O超导体的参考临界温度(Tc)烧结8小时的样品的温度为90.1K。 (1)临界温度通常随着超导体的烧结时间的缩短而降低。然而，仅经过两分钟的激光照射，仅烧结一小时的材料就可以获得92 K的最高临界温度。最佳照射条件为激光功率40 W、扫描频率22 Hz。(2)为了提高临界电流密度，最佳照射条件为激光功率60 W、扫描频率42 Hz。2) Bi- Sr-Ca-Cu-O超导体对烧结50小时的参考样品(Tc=94.5 K)进行激光照射两分钟后，得到以下结果。 (1) 临界温度表现出与Y-Ba-Cu-O超导体。在激光功率20 W、扫描频率22 Hz的条件下，可获得102.4 K的最高临界温度。(2)临界电流密度在激光功率80 W、扫描频率62 Hz时呈现最大值。与参考样品相比，仅在激光照射两分钟后就观察到物理性能的显着改善。(3) 经证实，在激光功率 80 W、频率 62 Hz 的条件下，体积百分比从 69.9 % 提高到 84.3 %的扫描频率。

项目成果

M.Hasegawa: "Study on the Improvement of Physical Properties by CO_2 Laser Heat-Treatment" 1st International Conference Surface Treatment'93(U.K.). (1993)

M.Hasekawa：“CO_2 激光热处理改善物理性能的研究”第一届表面处理国际会议93（英国）。

長谷川 素由: "CO_2レーザによる超伝導材の物性改質" 精密工学会・1992年関西地方定期学術講演会論文集. 125-126 (1992)

Moyu Hasekawa：“CO_2激光对超导材料的性能改性”日本精密工程学会会议记录，1992年关西地区学术会议125-126（1992）。

M.Hasegawa: "Review of CO_2 Laser Application Studies in H.I.T." The 2nd HARIMA Int.Symposium-Material Processing by Non-Traditional Techniques-(Japan). 34-35 (1993)

M.Hasekawa：“CO_2 激光在 H.I.T. 中的应用研究综述”

M. Hasegawa: "Review of CO_2 Laser Application Studies in H. I. T." The 2nd HARIMA int. Symposium-Material Processing by Non-Traditional Techniques-. 34-35 (1993)

M. Hasekawa：“CO_2 激光在 H. I. T. 中的应用研究综述”

M.Hasegawa,Y.Konishi,T.Takasgi: ""The Improvement of YーBaーCuーO Superconductor by CO_2 Laser HeatーTreatment"" International Journal of The Japan Society Precision Engineering Vol.25,No.4(Dec.1991),pp.299〜300.

M.Hasekawa、Y.Konishi、T.Takasgi：“通过 CO_2 激光热处理改进 YーBaーCuーO 超导体”” 日本精密工程学会国际期刊第 25 卷第 4 期（12 月） .1991），第 299-300 页。