METHOD OF RECEIVING SILVER POWER AND SILVER POWER (VERSIONS), RECEIVED BY MENTIONED METHOD Russian patent published in 2009 - IPC B22F9/24 C25C5/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to powder metallurgy, particularly to silver powders for electrodes of chemical current source and metalceramic contacs and method of its receiving. It is precipitated silver hydroxyde from the solution of silver nitrate by solution of potassium hydroxide. Received silver hydroxyde is flushed and thermally disintegrated for silver oxide and water. Received silver oxide is mechanically treated and it is implemented thermal reconditioning up to metallic silver. Received powder is flushed from potassium hydroxyde at temperature 60÷80°C during 30÷60 minutes, crushed and compacted in ball crusher during 15÷20 minutes and separated for particle fractions by sizes. Received silver powder consists of cellular particles of value less than 56 mcm, with pores size in particles 0.3-3.0 mcm, allows specific surface area 0.07-0.12 m²/g and packed density 1.4-1.7 g/cm³ or from porous particles of size 56-160 mcm, with pores size in particles 0.3-5.0 mcm, allows specific surface area 0.1-0.2 m²/g, packed density 1.8-2.4 g/cm³ and fluidity 7-12 g/s or from porous particles of value 160-450 mcm, with pores size in particles 0.3-5.0 mcm, allows specific surface area 0.15-0.25 m²/g, packed density 1.8-2.7 g/cm³ and fluidity 8-14 g/s.

EFFECT: it is provided receiving of powder with defined structural and processing characteristics.

10 cl, 3 dwg, 1 tbl, 1 ex