Disclosed are a nano silver paste and a preparation method thereof. The nano silver paste of the present application includes nano silver powder, micron-tin based solder particles, a reducing agent, a dispersing agent, and a diluent. The nano silver paste of the present application is obtained by uniformly mixing the nano silver powder, the micron-tin based solder particles, the reducing agent, the dispersing agent, and the diluent. According to the nano silver paste of the present application, the problems of nano silver paste in the prior art of low stacking density during non-pressure sintering, high porosity, severe volume contraction, susceptibility to cracking, and low interface soldering rate are solved, thereby improving the mechanical properties and reliability of sintering positions.

Metallic copper fine particles coated with a fatty acid and an ester compound. Also disclosed is an antiviral agent containing the metallic copper fine particles and a method for producing the metallic copper fine particles.

Nano-engineered materials for powder metallurgy and workpieces created using the materials. Workpieces include primary phase powders having nano-engineered partial or complete coatings and/or secondary phases adhered to interfaces of their constituent materials. Nano-engineered coatings are provided for metallic, polymeric and/or ceramic powder metallurgy feedstock powders to produce workpieces with superior performance and/or functional benefits, as are methods of manufacturing injection molding and additive manufacturing feedstock powders containing these coatings and additional respective functional benefits.

The present disclosure relates to a composition that includes a solid core having an outer surface and a coating layer, where the coating layer covers at least a portion of the outer surface, the coating layer is permeable to hydrogen (H.sub.2), and the solid core is capable of reversibly absorbing and desorbing hydrogen.

Disclosed is a method for preparing vanadium or vanadium alloy powder from a vanadium-containing raw material through a shortened process, including: calcinating a mixture of a vanadium-containing raw material and an alkali compound for oxidation to form a water-soluble vanadate; purifying the vanadate followed by vanadium precipitation to produce an intermediate CaV.sub.2O.sub.6 with high purity; dissolving CaV.sub.2O.sub.6 in a molten-salt medium together with other raw materials to form a uniform reaction system; and introducing a reducing agent to the system followed by separation, washing and drying to produce vanadium or vanadium alloy powder having a particle size of 50-800 nm and a purity of 99.0 wt % or more. The method can continuously process vanadium-containing raw materials to prepare vanadium or vanadium alloy powder.

A method for synthesis of nanoparticles are described. The method includes dispersing metal oxide powder in a mixture of a base liquid and a surfactant to form a primary mixture, grinding the primary mixture using a grinding media by periodically adding a surfactant solution to form a slurry, extracting a predetermined amount of sample from the slurry at periodic time intervals to obtain a testing solution to assess particle size of in the slurry using a particle size analyzer; and systematically adding the surfactant solution and the grinding media to the slurry based on the assessed particle size in the testing solution until a mean particle size of the nanoparticles is achieved.

A phosphor bronze alloy powder having antibacterial properties, deodorizing properties, and freshness keeping properties, comprising 1.05% by weight of tin and 0.09% by weight of phosphorus, wherein the remainder is composed of copper and unavoidable impurities.

Provided is A metal paste for joints, containing: metal particles; and monovalent carboxylic acid having 1 to 9 carbon atoms, in which the metal particles include sub-micro copper particles having a volume average particle diameter of 0.12 m to 0.8 m, and a content of the monovalent carboxylic acid having 1 to 9 carbon atoms is 0.015 part by mass to 0.2 part by mass with respect to 100 parts by mass of the metal particles.

A method of synthesizing aluminum nitride, the method includes: preparing mixed powder containing 0.5 to 8 wt % of zinc powder, 0.01 to 2 wt % of magnesium powder, 0.01 to 1 wt % of silicon powder, 0.01 to 1 wt % of copper powder, and a balanced amount of aluminum powder; preparing a feedstock of the mixed powder blended and filled with thermoplastic organic binder, by pressured kneading the mixed powder and the thermoplastic organic binder; forming granules of the feedstock by crushing the feedstock or forming a molded body of the feedstock via a powder molding method; and debinding the granules or the molded body by heating under a nitrogen gas atmosphere, and then performing direct nitridation between aluminum and a nitrogen gas at a temperature higher than a debinding temperature.

Embodiments of a method for producing powder mixtures having uniform dispersion of ceramic particles within larger superalloy particles are provided, as are embodiments of superalloy powder mixtures. In one embodiment, the method includes producing an initial powder mixture comprising ceramic particles mixed with superalloy mother particles having an average diameter larger than the average diameter of the ceramic particles. The initial powder mixture is formed into a consumable solid body. At least a portion of the consumable solid body is gradually melted, while the consumable solid body is rotated at a rate of speed sufficient to cast-off a uniformly dispersed powder mixture in which the ceramic particles are embedded within the superalloy mother particles.