A rare-earth permanent magnetic powder, a bonded magnet containing thereof and a device using the bonded magnet are provided of the present disclosure. The rare-earth permanent magnetic powder comprises: 70 vol % to 99 vol % of a hard magnetic phase and 1 vol % to 30 vol % of a soft magnetic phase, the hard magnetic phase has a TbCu.sub.7 structure, and the grain size of the hard magnetic phase is 5 nm to 100 nm; the soft magnetic phase is a Fe phase having a bcc structure, the average grain size of the soft magnetic phase is 1 nm to 30 nm, and the standard deviation of the grain size is below 0.5.

Novel metallic systems and methods for their fabrication provide an extreme creep-resistant nano-crystalline metallic material. The material comprises a matrix formed of a solvent metal with crystalline grains having diameters of no more than about 500 nm, and a plurality of dispersed metallic particles formed on the basis of a solute metal in the solvent metal matrix and having diameters of no more than about 200 nm. The particle density along the grain boundary of the matrix is as high as about 2 nm.sup.2 of grain boundary area per particle so as to substantially block grain boundary motion and rotation and limit creep at temperatures above 35% of the melting point of the material.

Described herein is a method of producing an alloy. The method includes pouring a stream of molten mixture of component elements of the alloy, separating the stream into discrete pieces, solidifying the discrete pieces by cooling before the discrete pieces contact any liquid or solid. Also described herein is another method of producing an alloy. This method includes pouring and solidifying a stream of molten mixture of component elements of the alloy into a rod or pulling a rod from a molten mixture of component elements of the alloy, before the rod contacts any liquid or solid, separating the rod into discrete pieces. An apparatus suitable for carrying out the methods above can include a container from which the molten stream is poured or the solid rod extends, one or more coil, conductive plates, a laser source, or an electron beam source arranged around the molten stream or the solid rod and configured to separate the molten stream or the solid rod into discrete pieces.

A method for manufacturing an amorphous alloy by using liquid pig iron is described. An exemplary embodiment provides a method for manufacturing an amorphous alloy, including providing liquid pig iron, adding an alloy material to the liquid pig iron, and solidifying the liquid pig iron.

A magnetic powder contains at least the first alloy powder and the second alloy powder in which those composition are different. The second alloy powder has a smaller median diameter than the first alloy powder and contains Cr of 0.3-14 at %. The first alloy powder has a Cr content of 0.3 at % or less. With respect to the total sum of the first alloy powder and the second alloy powder, a content of the second alloy powder is 20-50 vol % and the ratio of the median diameter of the first alloy powder to the second alloy powder is 4-20. The first alloy powder comprises either an amorphous phase or a crystalline phase having an average crystallite size of 50 nm or smaller. Thereby, a magnetic powder having low magnetic loss and good corrosion resistance without damaging insulation resistance and saturation magnetic flux density can be realized.

Provided are a silver powder that is suitable as a conductive filler for a conductive paste that enables low-temperature firing and a method of producing this silver powder. The method of producing a silver powder includes an azole addition step of adding an azole to a silver ammine complex aqueous solution to obtain a first liquid, a reductant addition step of adding a reductant to the first liquid to obtain a second liquid, and a fatty acid addition step of adding a fatty acid to the second liquid to obtain a third liquid. The fatty acid is an unsaturated fatty acid including two or more double bonds.

In response to the demand for shape-controlled metal microparticles accompanying rapid development and progress in industry in recent years, metal microparticles, which have projections on the surfaces of the particles that are integrated with the particles, are provided. The metal microparticles have integrated conical projections on the surfaces of the particles, and at least some of the projections are more than ? of the size of the particles. The protrusions that protrude from the metal microparticles melt and deform at a temperature lower than the melting point of the metal itself.

In response to the demand for shape-controlled metal microparticles accompanying rapid development and progress in industry in recent years, metal microparticles, which have projections on the surfaces of the particles that are integrated with the particles, are provided. The metal microparticles have integrated conical projections on the surfaces of the particles, and at least some of the projections are more than ? of the size of the particles. The protrusions that protrude from the metal microparticles melt and deform at a temperature lower than the melting point of the metal itself.

A method for producing a water-atomized metal powder, comprising applying water to a molten metal stream, dividing the molten metal stream into a metal powder, and cooling the metal powder, wherein the metal powder is further subjected to secondary cooling with cooling capacity having a minimum heat flux point (MHF point) higher than the surface temperature of the metal powder in addition to the cooling and the secondary cooling is performed from a temperature range where the temperature of the metal powder after the cooling is not lower than the cooling start temperature necessary for amorphization nor higher than the minimum heat flux point (MHF point).

A liquid dispersion of metal nanoparticles for solder paste comprises metal nanoparticles made of an alloy and a reducing dispersion medium, wherein the metal nanoparticles have an average particle diameter of 1.0 to 200 nm, the metal nanoparticles have a sintering initiation temperature of less than 50 C., and the liquid dispersion comprises substantially no surfactant or surface modifier.