Method taking organic solvent as medium for grading nano-nickel powder for MLCC (multilayer ceramic capacitor)

An organic solvent, nano-nickel powder technology, applied in chemical instruments and methods, solid separation, wet separation, etc., can solve the problems affecting the classification efficiency of hydrocyclones, the increase of powder surface roughness, and the large specific surface area and surface energy. and other problems, to achieve the effect of good dispersion, narrow particle size distribution and good number of large particles

Active Publication Date: 2012-01-25
JIANGSU BOQIAN NEW MATERIALS
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Problems solved by technology

When using water as the grading medium to classify nano-nickel powder with a hydrocyclone, due to the small particle size, large specific surface area and surface energy of the nano-nickel powder, the surface of the powder is very easy to absorb water and chemically react with it to form a new surface structure. Ni-O-H, this type of mechanism will further form hydrogen bonds and cause the agglomeration of nickel

Method used

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  • Method taking organic solvent as medium for grading nano-nickel powder for MLCC (multilayer ceramic capacitor)
  • Method taking organic solvent as medium for grading nano-nickel powder for MLCC (multilayer ceramic capacitor)

Examples

Experimental program
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Example Embodiment

[0024] Example 1:

[0025] (1) Take the nano nickel powder with an average particle size of 380nm prepared by PVD method as raw material, add it to the absolute ethanol with a concentration of 99.9%, and control the solid content at 20%;

[0026] (2) Use an emulsifier to emulsify and disperse the above solid-liquid system, the dispersion time is maintained for 30 minutes, and the slurry temperature is controlled at 30 ℃ ~ 35 ℃;

[0027] (3) Use a centrifugal pump to send the dispersed slurry to the hydrocyclone. The inlet pressure of the cyclone is controlled at 0.8Mpa, the inlet slurry flow of the cyclone is controlled at 200L / min, and the slurry flow at the bottom outlet of the cyclone is controlled at 20L / min;

[0028] (4) Use SEM / BET / PSD (scanning electron microscope / specific surface area detection / laser particle size analysis) to detect the overflow slurry. According to the detection results, the cyclone classification time is controlled at 60min, and the classification obtains u...

Example Embodiment

[0031] Example 2:

[0032] (1) Take the nano-nickel powder with an average particle size of 300nm prepared by PVD method as raw material, add it to isopropanol with a concentration of 99.9%, and control the solid content at 20%;

[0033] (2) Use an emulsifier to emulsify and disperse the above solid-liquid system, the dispersion time is maintained for 30 minutes, and the slurry temperature is controlled at 30 ℃ ~ 35 ℃;

[0034] (3) Use a centrifugal pump to send the dispersed slurry into the hydrocyclone. The inlet pressure of the cyclone is controlled at 1.5Mpa, the inlet slurry flow of the cyclone is controlled at 70L / min, and the slurry flow at the bottom outlet of the cyclone is controlled at 17L / min.

[0035] (4) Use SEM / BET / PSD to test the overflow slurry, and control the classification time to 15min according to the test results. The classification will obtain qualified nickel with uniform particle size, few large particles (≥0.6um) and average particle size of about 200nm Pow...

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Abstract

The invention discloses a method taking an organic solvent as a medium for grading nano-nickel powder for an MLCC (multilayer ceramic capacitor), which comprises the following steps of: taking metal nickel powder in the average particle size of below 1000nm as raw materials, adding into the organic solvent and mixing so as to get a solid-liquid system; then performing mechanical dispersion treatment to get slurry; sending the slurry into a cyclone through a booster pump, controlling the pressure of the slurry at an inlet of the cyclone at 0.1-2.0Mpa, controlling the flow rate at a material inlet of the cyclone at 10-200L/min, and controlling the flow rate at an underflow port of the cyclone at 2-20L/min; and collecting the slurry overflowed from an overflow port of the cyclone to get the nickel powder with the required particle size distribution. The method has the advantages of not only ensuring the grading efficiency of the cyclone, but also preventing affecting the surface morphology of the powder.

Description

technical field [0001] The invention relates to the technical field of nano-nickel powder classification, in particular to a method for classifying nano-nickel powder for MLCC (chip multilayer ceramic capacitor) by using an organic solvent as a medium and utilizing a hydrocyclone. Background technique [0002] The traditional MLCC internal electrode material is Pd / Ag alloy or pure Pd electrode, but due to its high cost, it is an important trend in the development of MLCC to replace Pd / Ag electrodes with cheap metal materials. In order to take into account both large capacity and low cost The metal Ni (cheap) electrode is a good choice. At present, the Ni electrode has become a low-price metal electrode with the highest degree of practicality and the most extensive research. The raw materials of nickel powder used in the production of MLCC internal electrodes should have the following properties: spherical, uniform, high purity, and high crystallinity. [0003] PVD (Physica...

Claims

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Application Information

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IPC IPC(8): B03B5/34
Inventor 蔡俊王翠霞陈钢强王利平
Owner JIANGSU BOQIAN NEW MATERIALS
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