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Preparation method of MLCC nickel inner electrode slurry

A technology of inner electrode and slurry, which is applied in the direction of conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, fixed capacitor electrodes, etc., can solve the problem of not fully acting on ceramic powder, affecting the capacitance of MLCC, and insufficient dispersion effect Excellent and other problems, to achieve the effect of uniform long-term stability, small surface roughness, uniform dispersion effect

Active Publication Date: 2022-07-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At this time, the slurry system is a suspension, and stratification will inevitably occur after standing for a long time, resulting in the agglomeration of inorganic particles
And because the particle size of nickel powder is larger than that of ceramic powder, and the dispersant is added at one time, the dispersant often interacts with nickel powder and cannot fully act on ceramic powder, so the dispersion effect is not good
Therefore, the ceramic powder in the prepared nickel paste is more likely to agglomerate to form large particles, which affects the capacitance of MLCC

Method used

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  • Preparation method of MLCC nickel inner electrode slurry
  • Preparation method of MLCC nickel inner electrode slurry
  • Preparation method of MLCC nickel inner electrode slurry

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Effect test

Embodiment 1

[0029] A preparation method of MLCC nickel inner electrode slurry, the process steps are as follows:

[0030] (1) BaTiO with an average diameter of 100 nm 3 Powder, Aqueous Suspension Tween 80, Deionized Water, Hydroxyethyl Cellulose Blend, BaTiO 3 The mass ratio of powder, deionized water, and hydroxyethyl cellulose is 20:20:1. The water suspension agent Tween80 accounts for 0.5% of the mass of the ceramic powder. Stir for at least 10 minutes, and emulsifier at 3000 revolutions for 30 minutes until there are no large particles to obtain BaTiO. 3 an aqueous suspension;

[0031] (2) Mix octanol, terpineol, and ethyl cellulose according to a mass ratio of 18:72:10, and mechanically stir at 60°C for 5 hours to obtain an organic carrier;

[0032] (3) Combine the aqueous suspension prepared in step (1), the organic carrier prepared in step (2), Ni powder with an average diameter of 300 nm, terpineol, emulsifier sodium dodecyl sulfate (SDS), and phosphate dispersant. NP-4 is mixe...

Embodiment 2

[0035] A preparation method of MLCC nickel inner electrode slurry, the process steps are as follows:

[0036] (1) BaTiO with an average diameter of 100 nm 3 Powder, Aqueous Suspension Maleic Acid-Acrylic Acid Sodium Salt, Deionized Water, Hydroxyethyl Cellulose Mix, BaTiO 3 The mass ratio of powder, deionized water, and hydroxyethyl cellulose is 20:20:1, and the aqueous suspension agent maleic acid-sodium acrylic acid accounts for 1.5% of the mass of the ceramic powder. Stir for 15 minutes, and the emulsifier turns 3000 for 45 minutes. Large particles, resulting in BaTiO 3 an aqueous suspension;

[0037] (2) Mix octanol, terpineol, and ethyl cellulose according to a mass ratio of 18:72:10, and mechanically stir at 60°C for 5 hours to obtain an organic carrier;

[0038] (3) Mix the aqueous suspension prepared in step (1), the organic carrier prepared in step (2), Ni powder with an average diameter of 300 nm, terpineol, emulsifier monostearic fatty acid glyceride, and phospha...

Embodiment 3

[0041] A preparation method of MLCC nickel inner electrode slurry, the process steps are as follows:

[0042] (1) BaTiO with an average diameter of 100 nm 3 Powder, Aqueous Suspension Calcium Lignosulfonate, Deionized Water, Hydroxyethyl Cellulose Blend, BaTiO 3 The mass ratio of powder, deionized water and hydroxyethyl cellulose is 20:20:1, the water suspension agent calcium lignosulfonate accounts for 2.5% of the mass of the ceramic powder, stir for 15 minutes, and emulsifier at 3000 revolutions for 60 minutes until there are no large particles , to get BaTiO 3 an aqueous suspension;

[0043] (2) Mix octanol, terpineol, and ethyl cellulose according to a mass ratio of 18:72:10, and mechanically stir at 60°C for 5 hours to obtain an organic carrier;

[0044] (3) Disperse the aqueous suspension prepared in step (1), the organic carrier prepared in step (2), Ni powder with an average diameter of 300 nm, terpineol, emulsifier octylphenol polyoxyethylene ether (10), and phosphat...

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Abstract

A preparation method of an MLCC nickel inner electrode slurry relates to a preparation method of an electrode slurry, and comprises the following steps: mixing BaTiO3 powder, a water suspending agent, deionized water and hydroxyethyl cellulose to obtain a water suspension; mixing octanol, terpilenol and ethyl cellulose to obtain an organic carrier; mixing the water suspension, an organic carrier, Ni powder, terpilenol, an emulsifier and a phosphate dispersant NP-4, and grinding by a three-roller mill until the water suspension of barium titanate forms stable emulsion liquid drops in a terpilenol system to obtain a barium titanate emulsion system; and carrying out suction filtration on the prepared emulsion to obtain the nickel inner electrode slurry. The stable emulsion is finally formed in a slurry system and has more uniform dispersion effect and long-term stability, not only can the shrinkage inhibition capability of barium titanate be fully exerted, but also smaller surface roughness of a sintered nickel electrode film can be realized, the number of laminated layers of the MLCC is increased, and higher capacitance is obtained.

Description

technical field [0001] The invention relates to a preparation method of electrode slurry, in particular to a preparation method of MLCC nickel inner electrode slurry. Background technique [0002] At present, the nickel paste used in ultra-high capacitance multilayer chip ceramic capacitor products such as 0201X104, 0201X105, 0201X224, 0402X106, etc., requires the particle size of nickel powder to be 0.3 microns, and the particle size of barium titanate powder to be 0.1 microns. The particle size becomes very demanding for dispersion. However, most of the current researches focus on the dispersibility of nickel powder, while ignoring the research on ceramic powder. The preparation method of nickel internal electrode slurry for MLCC is mainly to grind and disperse metal powder, mix and stir with ceramic powder, dispersant, binder and organic solvent, and then roll it with a three-roll mill. [0003] At this time, the slurry system is a suspension, and if it is left standing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B1/16H01B1/22H01G4/008H01G4/30
CPCH01B13/00H01B1/16H01B1/22H01G4/008H01G4/30
Inventor 刘振国王经伟蔡昌华
Owner NORTHWESTERN POLYTECHNICAL UNIV
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