Fine nickel powder and process for producing the same

Details Fine nickel powder and process for producing the same Fine nickel powder and process for producing the same

2005-11-04

2009-10-20

King, Roy (Department: 1793)

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

C075S255000, C075S343000, C075S363000, C075S374000

Reexamination Certificate

active

07604679

ABSTRACT:
An efficient process for producing fine nickel powder, capable of metallizing the powder at low temperature to prevent its sintering, and fine nickel powder produced by the process, composed of particles having a flat shape, diameter of limited variations and uniform thickness, and suitable for internal electrodes for laminate ceramic capacitors of high electric capacity. The process comprises a step for forming a nickel compound coated with gelatin by adsorbing gelatin on preformed nickel compound particles with different size and shape (Step (A)), and another step for converting said nickel compound coated with gelatin into fine particles containing metallic nickel and nickel oxide by heating the nickel compound coated with gelatin produced in Step (A) in an inert gas atmosphere (Step (B)). It may include an additional step (Step (C)), subsequent to Step (B), for completely reducing nickel oxide in said fine particles by heating at temperature lower than that for Step (B) in a reducing gas atmosphere.

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Chen et al., A new and facile route to ultrafine nanowires, superthin flakes and uniform nanodisks of nickel hydroxide, Mar. 2, 2005, Chemical Physics Letters, 405, 159-164.
Sun, Yugang, et al.; “Transformation of Silver Nanospheres into Nanobelts and Triangular Nanoplates through a Thermal Process;”Nano Letters; vol. 3, No. 5, pp. 675-679 (2003).
Ishikawa, Tatsuo, et al.; “Formation of Monodispersed Pure and Coasted Spindle-Type Iron Particles;”Langmuir; vol. 4, No. 1, pp. 26-31 (1988).

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