Processes for coating superconducting films on devices
OwnerArun K. Mehrotrainventor
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Abstract
A method for coating a device with superconducting material is disclosed. The method includes coating a thin pre-layer of superconducting material on the device, heat treating the thin pre-layer, coating a second layer on the heat-treated thin pre-layer and heat treating the second and thin pre-layers. The method prevents or substantially prevents bleeding of superconducting material into uncoated regions of the device. Another disclosed method involves the mechanical polishing of the device prior to coating with the superconducting material. Such a preliminary mechanical polishing reduces scratches and surface defects which, by way of capillary action, can contribute to the bleeding of the superconducting material from a coated region into an uncoated region of the device.
Claims37
A method for coating a superconducting film on a device, the method comprising:
- providing a device;
- coating a thin pre-layer of a superconducting precursor material on at least a portion of the device;
- heat treating the thin pre-layer;
- coating a second layer of the superconducting precursor material on the heat treated thin pre-layer;
- and
- heat treating the second layer and the thin pre-layer.
A method for coating a superconducting film on a portion of the a device while leaving another portion of the device uncoated and for controlling bleeding of superconducting materials onto the uncoated portion of the device during heat processing, the method comprising:
- providing a device;
- coating a thin pre-layer of a superconducting material onto a portion of the device leaving another portion of the device uncoated, the thin pre-layer having a thickness ranging from about 250 Å to about 750 Å;
- heat treating the thin pre-layer film at a first temperature;
- coating a second layer of the superconducting material on the thin pre-layer;
- and
- heat treating the second layer and thin pre-layer at a second temperature, the second temperature being higher than the first temperature, the heat treated second layer and thin pre-layer having a combined thickness ranging from about 250 Å to about 750 Å.
A method for coating a superconducting film on a device, the method comprising:
- providing a device;
- mechanically polishing the device;
- coating at least one layer of superconducting precursor material on at least a portion of the device leaving another portion of the device uncoated;
- and
- heat treating the superconducting material.
A method for coating a superconducting film on a portion of the a device while leaving another portion of the device uncoated and for controlling bleeding of superconducting materials onto the uncoated portion of the device during heat processing, the method comprising:
- providing a mechanically polished zirconia device;
- coating a thin pre-layer of a superconducting precursor material onto a portion of the device leaving another portion of the device uncoated, the thin pre-layer having a thickness ranging from about 250 Å to about 750 Å;
- heat treating the thin pre-layer film at a first temperature;
- coating a second layer of the superconducting precursor material on the thin pre-layer;
- and
- heat treating the second layer and thin pre-layer at a second temperature, the second temperature being higher than the first temperature, the heat treated second layer and thin pre-layer having a combined thickness ranging from about 250 Å to about 750 Å;
- wherein the first temperature is less than 900° C. and the second temperature ranges from about 1000° C. to about 1100° C.
Dependencies are inferred from the claim text.