Treatment method of nano nickel powder for sulfur-containing multi-layer ceramic chip capacitor

A multi-layer ceramic and nano-nickel powder technology, which is applied in the treatment field of nano-nickel powder, can solve the problems of unstable coating of sulfur-containing organic compounds, difficulty in guaranteeing the stability of sulfur content, and inability to ensure low impurity of powders, etc. Low shrinkage, stable sulfur content, and excellent oxidation resistance

Active Publication Date: 2014-09-17
JIANGSU BOQIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this nickel powder former powder is prepared by chemical method, if its method of adding sulfur is applied to the nickel powder former powder that PVD method produces and can cause following problem: the coating of sulfur-containing organic compound is very unstable, is easily washed off by organic solvent, and In the process of drying or spray drying, it is easy to desulfurize, resulting in uneven coating of nickel powder, and it is difficult to ensure the stability of sulfur content. At the same time, the method cannot guarantee the low impurity of the powder

Method used

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  • Treatment method of nano nickel powder for sulfur-containing multi-layer ceramic chip capacitor
  • Treatment method of nano nickel powder for sulfur-containing multi-layer ceramic chip capacitor
  • Treatment method of nano nickel powder for sulfur-containing multi-layer ceramic chip capacitor

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Effect test

Embodiment 1

[0036] (1) Use nano-nickel powder with an average particle size of 270-300nm prepared by PVD method as a raw material, add it to deionized water, and mix the solid-liquid system, and its solid content is controlled at 30%.

[0037] (2) Use an emulsifier to emulsify and disperse the above solid-liquid system. The dispersion time is maintained for 30 minutes, and the temperature of the slurry is controlled at 20°C~35°C.

[0038] (3) Add glacial acetic acid with a solid content of 2% mass to the solid-liquid system obtained in the above (2), stir ultrasonically for 75 minutes, and then filter out the acid liquid from the above solid-liquid system through magnetic plate adsorption.

[0039] (4) Add deionized water to the slurry after filtering out the acid liquid to make the solid content at 20%, stir it mechanically for 5 minutes, then absorb the solid-liquid system through a magnetic plate to filter out the upper liquid, and use pH test paper or pH The meter detects the pH of th...

Embodiment 2

[0046](1) Nano-nickel powder with an average particle size of 180-220nm prepared by PVD method is used as a raw material, and it is added to deionized water, and the solid content is controlled at 30%.

[0047] (2) Use an emulsifier to emulsify and disperse the above solid-liquid system, maintain the dispersion time for 30 minutes, and control the slurry temperature at 20°C~35°C.

[0048] (3) Add 2% powder weight of glacial acetic acid to the above solid-liquid system, stir it ultrasonically for 75 minutes, and then filter out the acid liquid by absorbing the above solid-liquid system through a magnetic plate.

[0049] (4) Add deionized water to the slurry after filtering out the acid liquid to make the solid content at about 20%, stir it mechanically for 5 minutes, then absorb the solid-liquid system through a magnetic plate to filter out the upper liquid, and use PH test paper or PH The meter detects the pH of the upper liquid.

[0050] (5) Repeat (4) until the pH is 6-7. A...

Embodiment 3

[0056] According to the same process of embodiment 1, the nickel powder of the same particle size range, the same organic acid treatment, only the sulfur-containing organic matter 0.25% quality tripolythiocyanate is replaced with 0.4% quality 2-mercaptobenzothiazole, Obtain embodiment 3 nickel powder.

[0057] Table 3 is the production process inspection data of 270~300nm low-impurity sulfur-containing nickel powder process

[0058]

[0059]

[0060] From the above three groups of results, it can be seen that under the same process conditions, the contents of Ca and Mg of nickel powders with different particle sizes have been significantly reduced after being treated with organic acids, and the content of Al impurities has also been reduced correspondingly. The oxygen content also decreased significantly before and after treatment, especially when the particle size was smaller, indicating that the hydroxide contained in the nickel powder was effectively removed. At the ...

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Abstract

The invention discloses a treatment method of nano nickel powder for a sulfur-containing multi-layer ceramic chip capacitor. The treatment method comprises the steps of: adding metal nickel powder into an inorganic solvent to obtain a solid-liquid system, wherein the solid content of the solid-liquid system is controlled at 5-50%; carrying out dispersing treatment and organic acid treatment in turn, and replacing with the inorganic solvent to adjust PH, so that the PH value is between 5.5 and 7.0, wherein the impurity content is controlled in the range of Al being less than 100ppm, Ca being less than 100ppm, Mg being less than 100ppm, Ge being less than 100ppm and Si being less than 100ppm; replacing the inorganic solvent with an organic solvent; carrying out mechanical dispersing treatment on the solid-liquid system; adding a sulfur-containing organic matter; and mechanically stirring, drying or spray drying to obtain sulfur-containing nickel powder. The treatment method has the advantages that low impurity of the metal nickel powder is guaranteed, the nickel powder is guaranteed to contain a certain ratio of sulfur, and the nickel powder is not easy to desulfurize.

Description

technical field [0001] The invention relates to a processing method for nano-nickel powder used in sulfur-containing chip multilayer ceramic capacitors. Background technique [0002] The internal electrode material of the traditional chip multilayer ceramic capacitor (MLCC) is Pd / Ag alloy or pure Pd electrode, but because of its high cost, it is an important trend in the development of MLCC to use base metal materials instead of Pd / Ag electrodes. In order to meet the requirements of large capacity and low cost, the base metal Ni electrode is a good choice. At present, the Ni electrode has become the most practical and most widely studied base metal electrode. [0003] As a general production method of MLCC, a dielectric powder such as barium titanate is mixed with an organic binder, suspended, and molded into a sheet by a doctor blade method to produce a dielectric green sheet. On the other hand, metal powder used as an internal electrode is mixed with an organic compound s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00
Inventor 吴慧星汪兴长
Owner JIANGSU BOQIAN NEW MATERIALS
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