EP0190767A2 — Superconductor for a magnetic field shielding and…

Claim 1

Independent Claim 141 words

A superconductor for a magnetic field shielding comprising a superconductor film (1) consisting of a material having a magnetic field shielding effect which in a characteristic curve illustrating the relationship between the thickness of a single layer of the superconductor film and the magnetic field shielding effect of the superconductor film, abruptly increases from the vicinity of the origin to a turning point and from the turning point gradually increases as the thickness of the superconductor film increases, characterized in that the superconductor (1); 3, 5, 7, 9, 11) comprises at least one composite lamination having a thin film of a superconductor and a metal layer (4, 6, 8, 10, 12) laminated with the thin film of the superconductor, and in that the superconductor film has a thickness not larger than that obtained at the turning point of the characteristic curve.

Claim 2

Dependent Claim 141 words

A superconductor for a magnetic field shielding comprising a superconductor film (1) consisting of a material having a magnetic field shielding effect which in a characteristic curve illustrating the relationship between the thickness of a single layer of the superconductor film and the magnetic field shielding effect of the superconductor film, abruptly increases from the vicinity of the origin to a turning point and from the turning point gradually increases as the thickness of the superconductor film increases, characterized in that the superconductor (1); 3, 5, 7, 9, 11) comprises at least one composite lamination having a thin film of a superconductor and a metal layer (4, 6, 8, 10, 12) laminated with the thin film of the superconductor, and in that the superconductor film has a thickness not larger than that obtained at the turning point of the characteristic curve.

Claim 3

Dependent Claim 27 words

The superconductor according to Claim 1, characterized in that the superconductor film is a film formed on said metal layer by thin-film forming techniques such as sputtering.

Claim 4

Dependent Claim 35 words

The superconductor according to Claim 1 or 2, characterized in that the superconductor film is closely contacted with the metal layer by ultrasonic soldering or is simply laminated with the metal layer without adhering means.

Claim 5

Dependent Claim 49 words

The superconductor according to any of Claims 1 to 3, characterized in that the superconductor film is made of niobium, niobium alloys, niobium compounds or vanadium compounds, especially Nb, N b-Ti, Nb-Zr, NbN-TiN, NbN, NbC, Nb 3 Sn, NbAl, Nb 3 Ga, Nb 3 Ge and/or V 3 Ga.

Claim 6

Dependent Claim 25 words

The superconductor according to any of Claims 1 to 4, charcterized in that said metal layer is a sheet metal made of aluminum or copper.

Claim 7

Dependent Claim 31 words

The superconductor according to any of Claims 1 to 5, characterized in that the metal layer is a thin aluminum film or a thin copper film made by thin-film forming techniques.

Claim 8

Dependent Claim 21 words

The superconductor according to any of Claims 1 to 6, characterized in that a plurality of the composite laminations are laminated.

Claim 9

Dependent Claim 41 words

The superconductor according to any of Claims 1 to 7, characterized in that the superconductor film is made of an Nb-Ti alloy film or an NbN.TiN alloy film and in that the metal layer is made of high-purity aluminum or copper.

Claim 10

Dependent Claim 32 words

The superconductor according to any of Claims 1 to 8, characterized in that the thickness of the superconductor film is about 20 µm, preferably in the range of 2 to 10 µm.

Claim 11

Dependent Claim 125 words

A process for making superconductors for a magnetic shielding, wherein a thin superconductor film is formed on a metal substrate, wherein the material of the superconductor film is used in such a quantity that the thickness of the superconductor layer is not larger than that obtained at the turning point of a characteristic curve showing the relationship between the thickness of a single layer of the superconductor film and the magnetic field shielding effect, which curve at first abruptly increases from the vicinity of the origin to the turning point and then only gradually increases further when the thickness of the film increases, and wherein at least one composite lamination is formed comprising at least one thin film of the superconductor and a metal layer.

Claim 12

Dependent Claim 125 words

A process for making superconductors for a magnetic shielding, wherein a thin superconductor film is formed on a metal substrate, wherein the material of the superconductor film is used in such a quantity that the thickness of the superconductor layer is not larger than that obtained at the turning point of a characteristic curve showing the relationship between the thickness of a single layer of the superconductor film and the magnetic field shielding effect, which curve at first abruptly increases from the vicinity of the origin to the turning point and then only gradually increases further when the thickness of the film increases, and wherein at least one composite lamination is formed comprising at least one thin film of the superconductor and a metal layer.

Superconductor for a magnetic field shielding and a process for making such superconductors

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