Powder metallurgy, in particular production of tungsten monocarbide spherical powders, which is a major component of metalloceramic hard alloys used for manufacture of tools, drill bits, steel alloying, wear-resistant coating cladding at elements operating in intensive wear conditions. The method includes melting of the starting material, and melt atomization with forming of spherical powder. As starting material a tungsten monocarbide grit is used. Melting and atomization of the material is implemented by continuous filling of grit into a rotating crucible of a centrifugal atomization device under an inert atmosphere and melting it by a plasma arc. After that an annealing of the obtained powder is made at a temperature of 1200-1400° C. during a time necessary for W.sub.2C breakup with subsequent cooling of the powder in a furnace. And, the production of tungsten monocarbide spherical powder with WC content of more than 70%.

Powder metallurgy, in particular production of tungsten monocarbide spherical powders, which is a major component of metalloceramic hard alloys used for manufacture of tools, drill bits, steel alloying, wear-resistant coating cladding at elements operating in intensive wear conditions. The method includes melting of the starting material, and melt atomization with forming of spherical powder. As starting material a tungsten monocarbide grit is used. Melting and atomization of the material is implemented by continuous filling of grit into a rotating crucible of a centrifugal atomization device under an inert atmosphere and melting it by a plasma arc. After that an annealing of the obtained powder is made at a temperature of 1200-1400° C. during a time necessary for W.sub.2C breakup with subsequent cooling of the powder in a furnace. And, the production of tungsten monocarbide spherical powder with WC content of more than 70%.

Method for manufacturing nanoparticles comprising a metallic core coated with a layer of polymer material comprising the following steps: a) preparing a water-in-oil emulsion comprising droplets of an aqueous phase, dispersed in an organic phase, b) adding nanoparticles comprising a metallic core coated with a shell of carbonaceous material, whereby nanoparticles trapped in the droplets are obtained, c) adding precursor monomers of the polymer material, and d) adding a polymerisation initiator, adding the precursor monomers and the polymerisation initiator resulting in polymerisation of the monomers, whereby nanoparticles coated with a layer of polymer material dispersed in the organic phase are obtained.

Method for manufacturing nanoparticles comprising a metallic core coated with a layer of polymer material comprising the following steps: a) preparing a water-in-oil emulsion comprising droplets of an aqueous phase, dispersed in an organic phase, b) adding nanoparticles comprising a metallic core coated with a shell of carbonaceous material, whereby nanoparticles trapped in the droplets are obtained, c) adding precursor monomers of the polymer material, and d) adding a polymerisation initiator, adding the precursor monomers and the polymerisation initiator resulting in polymerisation of the monomers, whereby nanoparticles coated with a layer of polymer material dispersed in the organic phase are obtained.

There is provided an inexpensive silver particle dispersing solution being usable as a slurry for ink jet, a method for producing the same, and a method for producing a conductive film using the silver particle dispersing solution. In a silver particle dispersing solution containing a silver powder and a solvent, the silver powder has an average primary particle diameter (D.sub.SEM) of 0.15 to 0.5 μm, and the ratio (D.sub.50/D.sub.SEM) of a particle diameter (D.sub.50), which corresponds to 50% of accumulation in volume-based cumulative distribution of the silver powder, to the average primary particle diameter (D.sub.SEM) is not less than 1.7, the silver powder having a fatty acid adhered to the surface thereof, and the solvent containing a monohydric higher alcohol having a carbon number of 6 to 12, butyl carbitol or butyl carbitol acetate as the main component thereof.

There is provided an inexpensive silver particle dispersing solution being usable as a slurry for ink jet, a method for producing the same, and a method for producing a conductive film using the silver particle dispersing solution. In a silver particle dispersing solution containing a silver powder and a solvent, the silver powder has an average primary particle diameter (D.sub.SEM) of 0.15 to 0.5 μm, and the ratio (D.sub.50/D.sub.SEM) of a particle diameter (D.sub.50), which corresponds to 50% of accumulation in volume-based cumulative distribution of the silver powder, to the average primary particle diameter (D.sub.SEM) is not less than 1.7, the silver powder having a fatty acid adhered to the surface thereof, and the solvent containing a monohydric higher alcohol having a carbon number of 6 to 12, butyl carbitol or butyl carbitol acetate as the main component thereof.

A system and a method for fabrication of bulk nanocrystal alloys is provided. The method may include subjecting powders of at least one material to an ultrasonic vibration at a first amplitude. The method may also include heating the powders in response to the ultrasonic vibration at a first temperature elevating rate corresponding to the first amplitude, and treating the powders in a temperature range corresponding to the first temperature elevating rate. The method may further include obtaining a bulk material composed of a plurality of crystal grains, the plurality of crystal grains having an average linear dimension equal to or larger than 10 nm. The method may further include obtaining a bulk material with amorphous structure with sufficient temperature cooling rate.

A magnetic powder contains a soft magnetic material represented by the following composition formula, in which an average particle size is 2 μm or more and 10 μm or less, and at least a surface layer is nanocrystallized,

Fe.sub.aCu.sub.bNb.sub.cSi.sub.dB.sub.e where, a, b, c, d, and e each indicates an atomic percentage, 71.0 at %≤a≤76.0 at %, 0.5 at %≤b≤1.5 at %, 2.0 at %≤c≤4.0 at %, 11.0 at %≤d≤16.0 at %, and 8.0 at %≤e≤13.0 at %.

The present invention relates to novel gold nanocrystals and nanocrystal shape distributions that have surfaces that are substantially free from organic impurities or films. Specifically, the surfaces are “clean” relative to the surfaces of gold nanoparticles made using chemical reduction processes that require organic reductants and/or surfactants to grow gold nanoparticles from gold ions in solution. The invention includes novel electrochemical manufacturing apparatuses and techniques for making the gold-based nanocrystals. The invention further includes pharmaceutical compositions thereof and the use of the gold nanocrystals or suspensions or colloids thereof for the treatment or prevention of diseases or conditions for which gold therapy is already known and more generally for conditions resulting from pathological cellular activation, such as inflammatory (including chronic inflammatory) conditions, autoimmune conditions, hypersensitivity reactions and/or cancerous diseases or conditions. In one embodiment, the condition is mediated by MIF (macrophage migration inhibiting factor).

The present invention relates to novel gold nanocrystals and nanocrystal shape distributions that have surfaces that are substantially free from organic impurities or films. Specifically, the surfaces are “clean” relative to the surfaces of gold nanoparticles made using chemical reduction processes that require organic reductants and/or surfactants to grow gold nanoparticles from gold ions in solution. The invention includes novel electrochemical manufacturing apparatuses and techniques for making the gold-based nanocrystals. The invention further includes pharmaceutical compositions thereof and the use of the gold nanocrystals or suspensions or colloids thereof for the treatment or prevention of diseases or conditions for which gold therapy is already known and more generally for conditions resulting from pathological cellular activation, such as inflammatory (including chronic inflammatory) conditions, autoimmune conditions, hypersensitivity reactions and/or cancerous diseases or conditions. In one embodiment, the condition is mediated by MIF (macrophage migration inhibiting factor).