Method for coating a semiconductor material using high...

H - Electricity – 01 – L

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H01L 39/24 (2006.01) H01L 39/00 (2006.01)

Patent

CA 2365437

The invention relates to a method for coating shaped bodies made of a superconducting material based on (Y/SE)BaCuO. The invention is characterized in that a coating consisting of a coating material is applied to at least one part of a surface of the shaped body, whereby the coating material at least partially melts at a lower temperature than that of the material of the shaped body and/or is flowable at a lower temperature than that of said material. The shaped body with the applied coating material is heated to a temperature at which the material of the shaped body does not yet melt and/or is not yet flowable, however at which the coating material is at least partially melted thereon and/or is in a flowable state. In addition, at least one part of the area of the shaped body located near the surface is modified at said temperature and/or during a successive cooling, and the shaped body treated in such a manner is enriched with oxygen during cooling and/or during a successive heat treatment, whereby the modification contributes to the increase in remanent induction and/or to the critical current density of the shaped body enriched with oxygen. The invention also relates to a shaped body made of a superconducting material which is based on (Y/SE)BaCuO and which can be obtained by using the above- mentioned method. Said superconducting material contains at least one rare-earth element selected from the group of Y, La, Ce, Pr, Nd, Eu, Gd, Th, Dy, Ho, Er, Tm, Yb and Lu and comprises a maximal value of remenant induction of at least 1100 mT at 77 K and 0 T.

L'invention concerne un procédé de traitement d'amélioration de corps moulés constitué d'un matériau supraconducteur à base de (Y/SE)BaCuO, qui se caractérise par le fait qu'un revêtement constitué d'un matériau de recouvrement est appliqué sur au moins une partie d'une surface du corps moulé, ledit matériau de recouvrement fondant au moins partiellement à une température inférieure à la température de fusion du matériau du corps moulé et/ou pouvant couler à une température inférieure à celle à laquelle le matériau du corps peut couler. Le corps moulé pourvu de son matériau de recouvrement est chauffé à une température à laquelle le matériau constituant le corps moulé proprement dit ne fond pas encore et/ou ne peut pas encore couler, mais à laquelle le matériau de recouvrement se trouve, au moins partiellement, à l'état fondu et/ou coulant. Au moins une partie d'une zone proche de la surface du corps moulé est modifiée à cette température et/ou par un refroidissement consécutif. Le corps moulé ainsi traité est enrichi en oxygène lors du refroidissement et/ou d'un traitement thermique consécutif, cette modification contribuant à l'augmentation de l'induction résiduelle et/ou de la densité de courant critique du corps moulé enrichi en oxygène. L'invention concerne en outre un corps moulé constitué d'un matériau supraconducteur à base de (Y/SE)BaCuO qui peut être obtenu selon le procédé susmentionné, qui contient au moins un élément des terres rares sélectionné dans le groupe comprenant Y, La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, Tl, Yb et Lu et qui présente une valeur maximale d'induction résiduelle, à 77 K et 0 T, d'au moins 1100 mT.

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