A method for manufacturing a part by alloying a precious metal with boron, wherein: a quantity of precious metal reduced to powder form is provided; a quantity of a nano-structured micrometric boron powder is provided; the precious metal powder is mixed with the nano-structured micrometric boron powder to obtain a mixture; the mixture is compacted by applying a uniaxial pressure; the mixture is subjected to a spark plasma sintering or flash sintering treatment, or to a hot isostatic pressing (HIP) treatment, to obtain an ingot of a precious metal/boron alloy, and the ingot is machined to obtain the part, or the ingot is reduced to powder form by a micronisation treatment and the powder is treated to obtain the part. Additionally, a gold/boron alloy.

Disclosed herein are compositions comprising silver nanoparticles with uniform particles and a narrow particle size distribution. Also disclosed herein are processes for preparing and purifying the dispersions of silver nanoparticles.

Provided herein are metal conductive compositions with improved conductivity. The improved conductivity is attributable to the addition of a sintering agent and a polymer emulsion.

The present invention relates to a glass powder and a silver-aluminum paste for use on a front of an N-type double-sided solar cell comprising a conductive silver powder, a silicon-aluminum alloy powder, the glass powder and an organic vehicle. The glass powder comprises the following components by weight: 0-50% of PbO, 0-50% of BiO, 5-15% of B.sub.2O.sub.3, 8-9% of SiO.sub.2, 2-3% of Al.sub.2O.sub.3 and 5-15% of ZnO; silicon and aluminum in the glass powder have a mass ratio of 4:1-5:1; the conductive silver powder has a content of 80-90 wt %; the conductive silver powder comprises a nano-silver powder and a silver alloy powder, and the nano-silver powder to the silver alloy powder have a mass ratio of 1:18-1:90.

The present invention relates to a glass powder and a silver-aluminum paste for use on a front of an N-type double-sided solar cell comprising a conductive silver powder, a silicon-aluminum alloy powder, the glass powder and an organic vehicle. The glass powder comprises the following components by weight: 0-50% of PbO, 0-50% of BiO, 5-15% of B.sub.2O.sub.3, 8-9% of SiO.sub.2, 2-3% of Al.sub.2O.sub.3 and 5-15% of ZnO; silicon and aluminum in the glass powder have a mass ratio of 4:1-5:1; the conductive silver powder has a content of 80-90 wt %; the conductive silver powder comprises a nano-silver powder and a silver alloy powder, and the nano-silver powder to the silver alloy powder have a mass ratio of 1:18-1:90.

A method for manufacturing a balance spring intended to equip a balance of a horological movement, including a step of producing a blank made of a Nb—Zr alloy including between 10 and 30 wt % Zr, a step of annealing and cooling the blank, at least one step of deforming the annealed blank in order to form a wire, wherein, before the deformation step, a step of depositing, on the blank, a layer of a ductile material chosen from copper, nickel, cupronickel, cupro-manganese, gold, silver, nickel-phosphorus Ni—P and nickel-boron Ni—B, in order to facilitate the wire shaping operation, the thickness of the ductile material layer deposited being chosen such that the ratio of the area of ductile material to the area of the alloy for a given wire cross-section is less than 1, preferably less than 0.5, and more preferably lies in the range 0.01 to 0.4.

A metal paste for low temperature bonding at temperatures 600° C. or lower, the metal paste comprising: a metal particle with an average particle size of 1 to 100 μm; a metal nanoparticle with an average particle size of 1 to 500 nm; a stress relieving material; and a dispersion medium to disperse the metal particle, metal nanoparticle, and the stress relieving material.

Provided are a silver article formed using pure silver, which has high Vickers hardness and prohibits the occurrence of metal corrosion and the occurrence of discoloration; and its method. Disclosed are a silver article and its method, wherein the Vickers hardness is adjusted to 60 HV or higher, and when the height of the peak of 2θ=38°±0.2° by an XRD is designated as h1, and that of 2θ=44°±0.4° is designated as h2, h2/h1 is adjusted to 0.2 or greater.

Provided are a silver article formed using pure silver, which has high Vickers hardness and prohibits the occurrence of metal corrosion and the occurrence of discoloration; and its method. Disclosed are a silver article and its method, wherein the Vickers hardness is adjusted to 60 HV or higher, and when the height of the peak of 2θ=38°±0.2° by an XRD is designated as h1, and that of 2θ=44°±0.4° is designated as h2, h2/h1 is adjusted to 0.2 or greater.

A preparation method using micro-nano bubbles as crystal seeds to induce spherical or spherical-type silver power production, said method specifically comprising the steps of: pre-adding a prepared dispersing agent solution to a reaction vessel, within the reaction vessel, simultaneously adding a prepared oxidizing solution (an aqueous solution containing silver ions or a silver ammonia solution) and a reducing solution (an aqueous solution containing one or a plurality of hydroxylamine compounds, vitamin C, formaldehyde or hydrazine hydrate), performing a reduction reaction under vigorous stirring, and using the pre-generated micro-nano bubbles within the dispersing agent solution as crystal seeds, the micro-nano bubbles crystal seeds effectively controlling the particle size of reduced silver particles throughout the reduction reaction. The method effectively controls the particle size of the silver powder during production, and also controls the crystal nucleus growth rate and dispersibility.