SURFACE TREATMENT OF SUPERCONDUCTING CERAMIC

PURPOSE:To prevent a superconducting ceramic from internal fracture due to the freeze-thaw action of the water therein, by coating the surface of a superconducting ceramic with a silicone-based sealant to stop the water movement through said surface. CONSTITUTION:The surface of a superconducting cer...

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Bibliographische Detailangaben
Hauptverfasser:	NIINO TOSHIFUMI, KIYOKAWA HIROSHI, ONE KIYOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE BASIC ELECTRIC ELEMENTS CABLES CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F CONCRETE CONDUCTORS ELECTRICITY INORGANIC CHEMISTRY INSULATORS LIME, MAGNESIA METALLURGY REFRACTORIES SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES SLAG TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	PURPOSE:To prevent a superconducting ceramic from internal fracture due to the freeze-thaw action of the water therein, by coating the surface of a superconducting ceramic with a silicone-based sealant to stop the water movement through said surface. CONSTITUTION:The surface of a superconducting ceramic is coated with a waterproof silicone-based sealant durable to liquefied nitrogen temperature. This coating prevents water movement through said surface, thus shielding the influence of the moisture in air on the ceramic. Therefore, when a superconducting ceramic is repeatedly dipped into liquefied nitrogen, the internal fracture of said ceramic due to the freeze-thaw action of the moisture in air can be prevented even taken out from the liquefied nitrogen into the air.