Specialized metallurgical processes – compositions for use therei – Processes – Producing or purifying free metal powder or producing or...
Reexamination Certificate
2006-08-07
2010-10-26
Brunsman, David M. (Department: 1793)
Specialized metallurgical processes, compositions for use therei
Processes
Producing or purifying free metal powder or producing or...
C502S337000, C423S138000, C423S140000
Reexamination Certificate
active
07819939
ABSTRACT:
The invention relates to a method of making a nickel powder having an average particle size of less than about 100 nanometers, comprising contacting, at a temperature of about 50° C. to about 95° C., a reduction solution with a nickel solution to form a reaction mixture. The reduction solution comprises a base and a reducing agent. The nickel solution comprises a nickel compound water, a nucleation agent, a surfactant or dispersant, and combinations thereof. The yield of nickel nanoparticles is greater than about 90% relative to starting moles of nickel compound. The nickel powder is suitable for use in electronics applications and sintered metal applications.
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Feng et al., “Study of Making Nickel Nano Powder by Using Hydrazine Reduction Method,” Journal of Jiangsu Radio & Television Univ., vol. 15, Issue No. 6, Dec. 2004, pp. 36-41.
Wu et al., “Synthesis and characterization of nickel nanoparticles by hydrazine reduction in ethylene glycol,” Journal of Colloid and Interface Science 259 (2003), pp. 282-286.
Zheng et al., “Preparation of nickel nanopowders in ethanel-water system (EWS),” Materials Research Bulletin 36 (2001) pp. 947-952.
Feng Xiangdong
Xiang Yang
Yang Yi
Brunsman David M.
Ferro Corporation
Johnson Kevin M
Rankin , Hill & Clark LLP
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