A powder for the production of a superconducting component. The powder includes Nb.sub.xSn.sub.y, where 1≤x≤6 and 1≤y≤5, and three-dimensional agglomerates having a particle size D90 of less than 400 μm, as determined via a laser light scattering. The three-dimensional agglomerates have primary particles which have an average particle diameter of less than 15 μm, as determined via a scanning electron microscopy, and pores of which at least 90% have a diameter of from 0.1 to 20 μm, as determined via a mercury porosimetry.

Disclosed herein is a granulated powder comprising a metal, a crosslinking agent and a water-soluble thermoplastic binder. The thermoplastic binder accounts for 5.0 to 18 percent by volume of a total volume, the crosslinking agent accounts for 1.0 to 8.0 percent by volume of the total volume, and the metal accounts for a remainder. The thermoplastic binder is a water-soluble polyvinyl alcohol, a polyvinyl butyral, a polyvinyl pyrrolidone, a polyethylene glycol, a hydrolyzed polymaleic anhydride or any combination of the foregoing, the crosslinking agent is an epoxy resin, a polyester resin, a polyester polyol or any combination of the foregoing.

A carbon nanotube composite wire 2 includes: a carbon nanotube 6; and a sintered layer 8 attached to a surface of the carbon nanotube 6. The sintered layer 8 includes a large number of silver flakes 14. These silver flakes 14 are bonded to each other by sintering. Flat surfaces 16 of silver flakes 14 partly overlap, or are partly in contact with, flat surfaces 16 of other adjacent silver flakes 14. An electrically conductive network is formed by these silver flakes 14 being adjacent to each other.

The present disclosure relates to a method of preparing a nano-porous powder material. The method includes: firstly removing A in the alloy A.sub.xT.sub.y by using an ultrasonically-assisted de-alloying method to prepare a nano-porous T coarse powder, and then, allowing the nano-porous T coarse powder to perform M-ization reaction with a gas reactant containing M to obtain a nano-porous T-M coarse powder, and finally, further crushing the nano-porous T-M coarse powder using a jet mill to obtain a nano-porous T-M fine powder. The method can achieve low-cost mass production of the nano-porous T-M fine powder, bringing broad application prospects.

A copper powder containing copper particulates, wherein the copper powder has a number of particles with a particle size of 1.5 pm or more of 10000 or less per 10 mL of a solution, as measured in the solution using an in-liquid particle counter, the solution having a copper ion concentration of 10 g/L and being obtained by dissolving the copper particulates of the copper powder in nitric acid.

To provide a fine nickel powder for an internal electrode paste of an electronic component, the nickel powder obtained by a wet method and having high crystallinity, excellent sintering characteristics, and heat-shrinking characteristics. The nickel powder is obtained by precipitating nickel by a reduction reaction in a reaction solution including at least water-soluble nickel salt, salt of metal nobler than nickel, hydrazine as a reducing agent, and alkali metal hydroxide as a pH adjusting agent and water; the reaction solution is prepared by mixing a nickel salt solution including the water-soluble nickel salt and the salt of metal nobler than nickel with a mixed reducing agent solution including hydrazine and alkali metal hydroxide; and the hydrazine is additionally added to the reaction solution after a reduction reaction initiates in the reaction solution.

A method for manufacturing a magnetic powder includes a step of producing a magnetic powder by spray-drying a spray liquid containing first magnetic particles, second magnetic particles, a thermosetting resin, and an organic solvent. A magnetic powder includes first magnetic particles and a thermosetting resin coating film on surfaces of the first magnetic particles. The first magnetic particles are soft magnetic metal particles. The resin coating film contains second magnetic particles. The second magnetic particles have a smaller average particle size than the first magnetic particles.

A conductive paste contains (A) copper fine particles having an average particle diameter of 50 nm to 400 nm and a crystallite diameter of 20 nm to 50 nm, (B) copper particles having an average particle diameter of 0.8 μm to 5 μm and a ratio of a crystallite diameter to the crystallite diameter of the copper fine particles (A) of 1.0 to 2.0, and (C) a solvent.

A conductive paste contains (A) copper fine particles having an average particle diameter of 50 nm to 400 nm and a crystallite diameter of 20 nm to 50 nm, (B) copper particles having an average particle diameter of 0.8 μm to 5 μm and a ratio of a crystallite diameter to the crystallite diameter of the copper fine particles (A) of 1.0 to 2.0, and (C) a solvent.

An alloy powder preparation method according to an embodiment comprises the steps of: forming a mixture by mixing a plurality of metal compounds; and thermally treating the mixture, wherein, in the step of thermally treating the mixture, the process temperature changes according to the particle diameter of alloy powder. In addition, the step of thermally treating the mixture proceeds through hydrogen reduction at a process temperature of 300 to 700° C.