Method for preparing nickel fine powder

Details Method for preparing nickel fine powder Method for preparing nickel fine powder

1998-07-09

2000-09-19

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

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

75374, B22F 924

Patent

active

061205761

ABSTRACT:
A method for preparing nickel fine powder is herein disclosed, which comprises the steps of mixing an aqueous sodium hydroxide solution comprising, on the basis of the total weight of the sodium hydroxide present in the aqueous solution, 75 to 85% by weight of liquid caustic soda as specified in JIS K 1203 and 25 to 15% by weight, in total, of at least one of sodium hydroxide as specified in JIS K 8576 and solid caustic soda as specified in JIS K 1202, with an aqueous solution of nickel sulfate to form nickel hydroxide, then reducing the resulting nickel hydroxide with hydrazine and recovering nickel fine powder produced. The nickel fine powder prepared by the method has an average particle size of the primary particles ranging from 0.1 to 0.9 .mu.m, a D.sub.90 value of not more than 2.1 .mu.m and a tap density of not less than 3.5 g/cc. The nickel fine powder has a low degree of aggregation, a narrow particle size distribution and a high tap density and therefore, the powder is quite suitably used as a material for producing an internal electrode for a laminated ceramic condenser.

REFERENCES:
patent: 3850612 (1974-11-01), Montino et al.
patent: 4089676 (1978-05-01), Grundy
Jis K 1202, "Solid Caustic Soda", 1981, Reaffirmed 1986 (With Translation).
Jis K 1203, "Liquid Caustic Soda", 1981, Reaffirmed 1986 (With Translation).
Jis K 8576, "Sodium Hydroxide", 1989, (With Translation).

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