Nickel micro powder and manufacturing method thereof

A manufacturing method and technology of micropowder, applied in the direction of final product manufacturing, sustainable manufacturing/processing, alkaline battery electrodes, etc., can solve the problems of excellent crystallinity, no development of coarse particles mixed or agglomerated, and good crystallinity, etc. Excellent crystallinity, low cost, and simple production method

Active Publication Date: 2011-09-21
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the nickel fine powder described in this patent document 4, although the average crystallite size is The above, but compared with the average particle size, the crystallite size is as small as 1 / 10 or less, and its crystallinity does not change from the fine powder prepared by the wet method, so it cannot be said that the crystallinity is good
[0011] As mentioned above, there has not been developed a nickel powder that has less incorporation or aggregation of coarse particles, has excellent crystallinity, and can be produced at low cost.

Method used

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  • Nickel micro powder and manufacturing method thereof
  • Nickel micro powder and manufacturing method thereof
  • Nickel micro powder and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0152] The plasma input power of about 105kW was used for high-frequency plasma ignition, the total amount of argon was adjusted to 185L / min, the hydrogen was 18L / min, and the gas ambient pressure was 50kPa to obtain a stable plasma flame. A nickel raw material was supplied to the inside of the plasma flame at 2.3 kg / hr by carrying gas (24 L / min of argon), and micronized nickel was obtained.

[0153] Add 4kg of nickel powder (nickel, Type255, average particle size 2.2-2.8μm, manufactured by Inco Special Products and Inco Limited) to 16L of pure water, add 60g of sodium hydrosulfide hydrate (Sodiumhydrosulfide n-hydrate), and stir for 30 minutes . Thereafter, reslurry was performed once, filtration and vacuum drying (36 hours), and crushing were performed to obtain a nickel raw material. The sulfur content in the nickel raw material is about 0.2% by mass, and the oxygen content is about 0.4% by mass.

[0154] The temperature of the plasma flame is 10,000° C. or higher. Theref...

Embodiment 2

[0161] Except having flowed the swirl gas at 2000 NL / min, and the cyclone inlet velocity was 28 m / s, it carried out similarly to Example 1, obtained nickel fine powder, and evaluated it.

[0162] 500 particles of the obtained nickel fine powder were randomly selected from the field of view of 30,000 magnifications of FE-SEM, and the particle diameter was measured to obtain the number average particle diameter, which was 72 nm. The BET diameter is 78nm, and since the difference between them is 8%, the sphericity is very high. In addition, the fine nickel powder was analyzed by XRD, and the crystallite size was determined by the Scherrer method. The result was The crystallite size is 79% to the number average particle size, and it can be seen that a crystalline nickel fine powder close to a single crystal can be formed.

[0163] In the 10,000-magnification 80 field of view (approximately 860,000 particles) in the SEM observation, there are 10 coarse particles of 0.6 μm or more...

Embodiment 3

[0166] Except having flowed the swirling gas at 1000 NL / min and the cyclone inlet velocity was 14 m / s, it carried out similarly to Example 1, obtained nickel fine powder, and evaluated it.

[0167] 500 particles of the obtained nickel fine powder were randomly selected from the field of view of 30,000 times magnification of FE-SEM, and the particle diameter was measured to obtain the number average particle diameter, which was 98 nm. The BET diameter is 115 nm, and since the difference between them is 15%, the sphericity is very high. In addition, the fine nickel powder was analyzed by XRD, and the result of the crystallite size obtained by the Scherrer method was The crystallite size is 80% of the number average particle size, and it can be seen that a crystalline nickel fine powder close to a single crystal can be formed. also, figure 2 A FE-SEM photograph of the nickel fine powder obtained in Example 3 at 30,000 times magnification is shown.

[0168] In the 10,000-magn...

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Abstract

An aim of the invention is to provide a nickel micro powder which is spherical and has excellent crystallinity and oversize particle mixing ratio that is greatly reduced than that of the prior-art product. The manufacturing method of the nickel micro powder comprises the following steps: raw material preparing step of preparing a nickel raw material through a mode that the sulfur content is 0.1-0.5% by mass; a micronizing step of gasifying the nickel raw material through hot plasma in a reducing gas environment for condensing the nickel steam and micronizing; an oversize particle removing step of continuously guiding the obtained micronized nickel into a water cooling jacket type cyclone separator for removing the oversize particles and cooling the micronized nickel; a recycling step of recycling the micronized nickel; and a slow oxidizing step of keeping the recycled micronized nickel in a weak oxidative non-active gas environment so the surface of the micronized nickel is slowly oxidized for obtaining the nickel micro powder.

Description

technical field [0001] The invention relates to a nickel micropowder and a manufacturing method thereof. More specifically, it relates to nickel fine powder used as an electrode material for electronic components such as an internal electrode of a multilayer chip ceramic capacitor, and a method for producing the same. Background technique [0002] In recent years, there is a demand for miniaturization of electronic devices and materials for components used therein. To meet this demand, there is also a demand for finer micronization of nickel fine powder used as materials for electronic devices and components. In addition, nickel fine powders are required to have many excellent characteristics other than micronization. [0003] For example, in a multilayer chip ceramic capacitor (hereinafter referred to as "MLCC"), as one of the required characteristics, there is a reduction in particle size corresponding to a reduction in the thickness of the internal electrode material for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/22
CPCY02E60/124Y02E60/10B22F1/0003B22F9/14B22F2202/13H01G4/008H01M4/32Y02P70/50
Inventor 川上裕二石田荣治川岛刚金子勋
Owner SUMITOMO METAL MINING CO LTD
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