Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF5 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 powder, which will eventually affect the classification efficiency of the hydrocyclone
At the same time, the existence of the Ni-O-H structure will change the surface structure of the nickel powder and increase the surface roughness of the powder, which is manifested as an increase in the specific surface area of ​​the powder, which will seriously affect the application of nano-nickel powder in the field of MLCC.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Nano-nickel powder with an average particle size of 380nm prepared by PVD method is used as a raw material, and it is added to 99.9% absolute ethanol, and the solid content is controlled at 20%;

[0026] (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 30°C~35°C;

[0027] (3) Use a centrifugal pump to send the dispersed slurry into the hydrocyclone. The inlet pressure of the cyclone is controlled at 0.8Mpa, the flow rate of the slurry at the inlet of the cyclone is controlled at 200L / min, and the flow rate of the slurry 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, and control the classification time of the hydrocyclone to 60 minutes according to the detection results. Qualified nickel powd...

Embodiment 2

[0032] (1) Nano-nickel powder with an average particle diameter of 300nm prepared by PVD method is used as a raw material, and it is added to 99.9% isopropanol, and the solid content is controlled at 20%;

[0033] (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 30°C~35°C;

[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 flow rate of the slurry at the inlet of the cyclone is controlled at 70L / min, and the flow rate of the slurry at the bottom outlet of the cyclone is controlled at 17L / min.

[0035] (4) Use SEM / BET / PSD to detect the overflow slurry, and control the classification time to 15 minutes according to the detection results, and classify to obtain qualified nickel with uniform particle size, few large particles (≥0.6um), and an average particle size of about ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
The average particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B03B5/34
Inventor 蔡俊王翠霞陈钢强王利平
Owner JIANGSU BOQIAN NEW MATERIALS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com