Laser Treatment of Pressed Superconductor Powder of Bi System -2nd Report Application of Surface Melting Method-

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  • Ｂｉ系超電導圧粉体へのレーザ照射処理　　第２報：表面溶融法の適用
  • Biケイ チョウデンドウアップンタイ エ ノ レーザ ショウシャ ショリ ダイ2ホウ ヒョウメン ヨウユウホウ ノ テキヨウ
  • 2nd Report Application of Surface Melting Method
  • 第2報:表面溶融法の適用

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Abstract

The bulk specimen of superconductor powder shows no superconductive characteristics as die-pressed. In this paper, we propose a technique of forming a superconductive layer in the surface of the bulk specimen of a Bi system using a laser. The powder of the Bi system was press-formed, followed by melting of the surface scanned by a CO2 laser beam. This treatment results in a gradual temperature change, from the melting to the non-heat-affecting range both on the surface and inside the bulk. We found a superconductive layer, as thick as 130 μm, underneath the melted layer that shows semiconductive characteristics. This technique allows melting of the surface, and thus it has the advantage of high reproducibility without strict control of laser treatment conditions.

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