Method for chemical precipitation of metallic silver powder via

Details Method for chemical precipitation of metallic silver powder via Method for chemical precipitation of metallic silver powder via

1999-02-24

2000-08-29

Willis, Prince

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75343, 75371, 75955, 423 28, 423 34, C22B 1110

Patent

active

061102547

ABSTRACT:
A method for the chemical precipitation of metallic silver powder employs a two solution technique in which a solution of a tin salt and a solution a silver salt are mixed in the presence of an inorganic or organic acid, alumina, an anionic surfactant, and a colloid to form a precipitation solution at a temperature and pH suitable to effect the chemical precipitation of silver. Almost 80% by weight of the precipitated powder agglomerate is less than 25 .mu.m in diameter, and the individual powder particles which compose the agglomerate range in size from 0.2 to 2.0 .mu.m. In addition to the favorable size distribution, silver particles precipitated in the presence of a gelatin colloid can be used with a minimal amount of sieving so that little work hardening is imparted to the particles. The powder can be annealed at a temperature of up to 750.degree. C. for two hours in air with minimal sintering, and the acid-assisted hand consolidation of powder produced according to the present technique is capable of producing silver compacts which are nearly 80% dense. Advantageously, a hand consolidated silver compact which comprises the powder of the present invention equals or exceeds the transverse rupture strength, shear strength, creep, toughness, corrosion resistance, microleakage, and wear properties of conventional silver amalgam.

REFERENCES:
patent: 3997328 (1976-12-01), Greener
patent: 5318746 (1994-06-01), Lashmore et al.
patent: 5389122 (1995-02-01), Glicksman
patent: 5516355 (1996-05-01), Radhakrishnan
patent: 5711866 (1998-01-01), Lashmore et al.

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