Manufacturing process and application of nickel paste for multilayer ceramic capacitor

Abstract

The invention discloses a nickel slurry making process for a multilayer ceramic capacitor and an application thereof. The process comprises steps that the nickel powder, the ceramic powder, the dispersant and the plasticizer are mixed to prepare slurry according to a ratio, the slurry is placed together with a grinding material into a mixing tank located in an inner cavity of a planetary ball mill; the inner cavity of the planetary ball mill is vacuumed; the mixing tank is obliquely set and is further subjected to ultrasonic concussion and simultaneously rotates and revolves around the axis ofthe planetary ball mill for slurry grinding; the rotation speed of the mixing tank is improved, and slurry grinding is continued; after the inner cavity of the planetary ball mill is restored to atmospheric pressure, glue is added to the mixing tank according to a ratio; the inner cavity of the planetary ball mill is vacuumed; the mixing tank is obliquely set, is further subjected to ultrasonic concussion and simultaneously rotates and revolves around the axis of the planetary ball mill to obtain nickel slurry grinding material mixture; the nickel slurry after grinding material removal is filtered to obtain the highly-dispersed nickel slurry. Compared with the prior art, the nickel slurry dispersing effect is better, grading steps are omitted, materials are saved, production cost is reduced, and production efficiency is improved.

Description

technical field [0001] The invention relates to a manufacturing process and application of conductive paste, in particular to a manufacturing process and application of nickel paste for multilayer ceramic capacitors. Background technique [0002] Multilayer ceramic capacitors (Multilayer Ceramic Capacitor, MLCC) is the most widely used type of chip components, with the characteristics of small size, high specific capacitance, and high precision, effectively reducing the size of electronic information terminal products (especially portable products) Volume and weight, improve product reliability. This puts forward higher requirements for its key raw materials. Since ultrafine powders have a large specific surface area and high surface energy, they are prone to agglomeration and spontaneous aggregation. How to disperse these ultrafine particles uniformly and make high-quality The slurry is its difficulty. At present, the method of making conductive paste is preliminary mixin...

AI Technical Summary

Problems solved by technology

However, this method can only be more effective for agglomerated particles that are easy to disperse or soft agglomerates, but for ultrafine powders, such as powders with a particle size of 200nm or less than 200nm, the specific surface area is large, and the surface energy High, it is not easy to be dispersed after agglomeration, especially when hard agglomeration occurs, the shear force generated by the three-roller machine is not enough to disperse the ultrafine powder more uniformly, thus affecting the dispersion of nano-scale conductive paste

[0003] The document "CN201110371038.6 A preparation method of nickel electrode paste for electronic components" discloses a preparation method of nickel paste, as follows: The present invention discloses a preparation method of nickel electrode paste for electronic components, including mixing Material, dispersing, rolling, filtering process steps, the dispersing process steps are: A. Weigh the organic solvent and metal powder successively and put them into the ultrasonic special barrel, then put the ultrasonic special barrel in the ultrasonic equipment for the initial dispersion treatment. Mix the nickel slurry; B, add the first mixed nickel slurry after step A to the organic carrier, put it into an ultrasonic device and carry out secondary stirring and dispersing treatment to obtain the secondary mixed nickel slurry; C, process the first mixed nickel slurry in step B Put the secondary mixed nickel slurry into the power mixer for three times of dispersion treatment to obtain the dispersed nickel slurry. The rotation speed of the power mixer is 600±15rpm, the revolution speed is 30±0.6rpm, and the three times of dispersion time is 60±5min , this method adds an ultrasonic pretreatment process before the dispersion of the three-roll mill, which increases the production time and the process is more complicated

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