Abstract:
A structure of superconductor wiring formed on an insulating substrate which has a superconductor pattern having a wiring of at least one superconductive ceramic formed on said substrate and a protective layer of a basic oxide covering said pattern. Since most of the superconductive ceramic is basic, the basic oxide never causes chemical reaction with the ceramic, so that the wiring can maintain superconductivity for a long time.
Abstract:
A process for producing superconductive ceramic sinter according to the invention comprises compounding a first powder of oxide(s) containing rare earth metal element(s), a second powder of oxide(s) or carbonate(s) of alkaline earth metal element(s), a third powder of copper oxide, and a fourth powder of metal fluoride in predetermined proportions, baking the resulting mixed powder to produce superconductive ceramic, molding a powder of said ceramic, and sintering the molding. The presence of the metal fluoride in said sinter in a predetermined amount serves to improve the toughness and density of the superconductive ceramic and facilitate the working of the ceramic.
Abstract:
Soudure d'alliage de Pb contenant de 1 à 65 % en poids de Sn ou de In ou des deux, le résidu étant composé de Pb et d'impuretés inévitables, avec moins de 50 ppb de radio-isotopes en tant qu'impuretés inévitables, de sorte qu'un comptage du nombre de particules alpha radioactives est inférieur à 0,5 CPH/cm2, permettant ainsi d'obtenir une résistance de liaison et une aptitude au mouillage excellentes. 1 à 10 % de Ag est également ajouté à cette soudure pour en améliorer ultérieurement les propriétés.
Abstract:
A high-Ni, high-Cr, iron alloy having excellent heat resistance, wear resistance, and thermal shock resistance, which can be used as an alloy for guide shoe of inclined hot-rolling mill for manufacturing seamless steel pipes and as an alloy for padding. It comprises 0.55 to 1.9 % C, 28 to 39 % Cr, 25 to 49 % Ni, 0.01 to 4.5 % Ti, 0.01 to 4.5 % Al, 0.1 to 8 % W, 0.1 to 9 % Mo, and the balance substantially consisting of iron. If necessary, it can contain 0.1 to 3 % Si, 0.1 to 2 % Mn, 1 to 8 % Co, 0.005 to 0.2 % N, 0.01 to 1.5 % Nb or Ta, 0.001 to 0.2 % B or Zr (all % by weight).
Abstract:
A superconductive structure comprising superconductive oxide ceramic powder having a perovskite structure and a metal sheath enclosing the powder. The metal sheath consists of an Ag portion and a non-Ag portion, the Ag portion exists from the inner surface through up to the outer surface, the superconductive ceramic powder portion in the structure is brought into contact with the non-Ag metal used as the metal sheath material through the interposition of the Ag material, and a compression oriented layer is formed maintaining a thickness greater than 0.5 mum in which the C-axis direction of crystals of the superconductive ceramic powder is perpendicular to the lengthwise direction of the superconductive structure. The invention further relates to a method of producing the superconductive structure. A superconductive composite wire and a superconductive composite cable having the described structure use Ag in amounts smaller than that of the conventional Ag-coated superconductive wires and superconductive cables, and exhibit excellent strength and high critical current density at both high and normal temperatures. These wires and cables can be produced easily.
Abstract:
A superconductive structure comprising a superconducive ceramic and a surrounding metal sheath. The metal sheath consists of an Ag portion and a non-Ag metal portion. In the Ag portion, Ag exists from the inner surface through up to the outer surface. Further, due to the interposition of the Ag material, the superconductive ceramic portion that exists inside the structure is brought into indirect contact with the non-Ag metal that is used as the metal sheath material.
Abstract:
A paste fur use in printing a superconductive film on a substrate, which comprises a first powder composed of composite oxide(s) and a second powder composed of carbonate(s) of an alkaline earth metal. The composite oxide contains at least one element selected from the group consisting of scandium, yttrium and lanthanoid elements, at least one element selected from the group consisting of alkaline earth metals, and copper. The superconductive film formed by using this paste shows a markedly improved current density without sacrificing its critical temperature by virtue of the presence of the second powder.
Abstract:
A co-based alloy containing C, Si, Cr, W, Mo, Ti, and Al and, if necessary, one or more of Mn, Ni, Fe, Nb, and B, which has high hardness at high temperatures, excellent thermal shock resistance and corrosion resistance against lead oxide and which can be used for padding in welding and for casting, thus exhibiting excellent properties when used for producing valves and valve sheets of high-performance engines.
Abstract:
A superconductive structure comprising an oxide superconductive ceramic powder having a perovskite structure and a metallic covering member or, preferably, an Ag covering member which encloses said powder, wherein a compression oriented layer is formed maintaining a thickness of greater than 5 mum in which the C-axis direction of crystals of the powder is oriented perpendicularly to the lengthwise direction of the superconductive structure. The invention further deals with a method of producing the same.
Abstract:
In preparing a target material for a superconducting film by hot press process, a vacuum atmosphere is replaced with an inert gas atmosphere containing 0.1 to 10 % by volume of oxygen and having a pressure of 1 to 100 Torr at a predetermined temperature ranging from 350 to 700°C in the step of raising the temperature, and a material to be sintered is held within said inert gas atmosphere for 1 to 10 hr, thereby preparing a target material having a homogeneous composition and freed from permanent set.