摘要:
In solder powder having an average particle size of 5 μm or less and constituted by a center core and a covering layer covering the center core, wherein the center core consists of an intermetallic compound of silver and tin, or silver and the intermetallic compound of silver and tin, the covering layer consists of tin, and an intermediate layer which consists of an intermetallic compound of copper and tin is interposed between the center core and the covering layer so that at least a part of the center core is covered thereby.
摘要:
In solder powder having an average particle size of 5 μm or less and constituted by a center core and a covering layer covering the center core, wherein the center core consists of an intermetallic compound of silver and tin, or silver and the intermetallic compound of silver and tin, the covering layer consists of tin, and an intermediate layer which consists of an intermetallic compound of copper and tin is interposed between the center core and the covering layer so that at least a part of the center core is covered thereby.
摘要:
A method for producing fine silver particles which is characterized by making an aqueous silver ammine complex solution and a reducing agent solution come in contact with each other in an open space to reduce the silver ammine complex and deposit fine silver particles, either in which the contacting is conducted by (i) a method of spraying an aqueous silver ammine complex solution and a reducing agent solution through nozzles or (ii) a method of discharging an aqueous silver ammine complex solution and a reducing agent solution from obliquely downward nozzles opposite to each other to thereby produce fine silver particles which are free from coarse particles having particle sizes of 5 μm or more and have a mean particle size of primary particles of 0.08 to 1.0 μm and crystallite sizes of 20 to 150 nm or in which an aqueous silver ammine complex solution having a silver concentration of 20 to 180 g/L and an organic reducing agent solution having a reducing agent concentration of about 0.6 to about 1.4 times the silver concentration by reaction equivalent are used to thereby stably produce fine silver particles having a mean particle size of primary particles of 0.05 to 1.0 μm and crystallite sizes of 20 to 150 nm.
摘要:
An object of the present invention is to provide tin(II) oxide powder which has extremely high solubility in an acid or an acidic plating solution, excellent in storage stability in the air and can heighten oxidation-preventive effect of Sn2+ ion in the plating solution. The method for manufacturing tin(II) oxide powder of the present invention comprises Step (11) of preparing an aqueous acidic solution containing Sn2+ ions, Step (12) of neutralizing the aqueous acidic solution by adding an aqueous alkaline solution to prepare a slurry of tin(II) hydroxide, Step (13) of dehydrating the prepared slurry to obtain a slurry of tin(II) oxide, Step (14) of separating the slurry of tin(II) oxide into a solid and a liquid to obtain tin(II) oxide, Step (15) of treating the obtained tin(II) oxide with an aqueous antioxidant solution, and Step (16) of vacuum drying the tin(II) oxide treated with the aqueous antioxidant solution.
摘要:
An object and a problem of the present invention is to provide tin(II) oxide powder which has extremely high solubility in an acid or an acidic plating solution and excellent in storage stability in the air. The tin(II) oxide powder of the present invention is for replenishing a tin component of a tin-alloy plating solution, and comprises 100 to 5000 ppm of an antioxidant being contained in the powder with a mass ratio, and has such a dissolution rate that when 0.1 g of the tin(II) oxide powder is added to 100 ml of 100 g/L aqueous alkylsulfonic acid solution at a temperature of 25° C. and stirred, then the powder dissolves therein within 180 seconds.