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Production method of MLCC capacitor

A capacitor and copper foil technology, applied in the field of capacitors, can solve problems such as easy cracking, avoid cracking, avoid improper sintering, and increase toughness

Active Publication Date: 2021-06-01
SUZHOU CHUANGHAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, many studies have shown that the larger the size of the product, the easier it is for the product to crack during welding and installation

Method used

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  • Production method of MLCC capacitor
  • Production method of MLCC capacitor
  • Production method of MLCC capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Dissolve polycarbonate plastic particles in N-methylpyrrolidone solvent, add 40wt% barium titanate ceramic particles with a diameter of 1 μm, stir into a uniform slurry, adjust to an appropriate viscosity, and put it into a coating machine . The coating machine is equipped with 8μm thick copper foil coils. With the rotation of the coating machine, the slurry made of ceramic particles and plastic particles is coated on the copper foil, and the coating thickness is 6μm. The copper foil passes through the dryer at a speed of 2m / mim, and the temperature of the dryer is kept at 150°C. After the slurry is dried, the plastic-cured bonding ceramic powder is coated on the surface of the copper foil and bonded together, and the surface is coated with plastic. Copper foil winding with ceramic powder. Next, an aluminum foil coated with plastic particles and ceramic particles was prepared by the same process and wound up. The thickness of the aluminum foil was 8 μm. The dryer i...

Embodiment 2

[0049] 1. Dissolve polyethylene plastic particles in acetone solvent, add 50wt% alumina ceramic particles with a diameter of 2 μm, stir to form a uniform slurry, adjust to an appropriate viscosity, and put it into a coating machine. The coating machine is equipped with a 10 μm thick copper foil coil. With the rotation of the coating machine, the slurry made of ceramics and plastic particles is coated on the copper foil, and the coating thickness is 8 μm. The copper coated with the slurry The foil passes through the dryer at a speed of 5m / min, and the temperature of the dryer is kept at 180°C. After the slurry is dried, the plastic-cured bonding ceramic powder is coated on the surface of the copper foil and bonded together, and the surface is coated with plastic and Copper foil winding of ceramic powder. The aluminum foil coated with plastic and ceramic powder was prepared by the same process and wound up. The thickness of the aluminum foil was 10 μm. The dryer is equipped wit...

Embodiment 3

[0053] Dissolve polyvinyl chloride plastic particles in DMF (N, N-dimethylacetamide) solvent, add 60wt% silicon nitride ceramic particles, the diameter of ceramic particles is 3 μm, stir into a uniform slurry, and adjust to an appropriate viscosity Put in coater. The coating machine is equipped with a 12 μm thick copper foil coil. With the rotation of the coating machine, the slurry made of ceramics and plastic particles is coated on the copper foil, and the coating thickness is 10 μm. The copper coated with the slurry is The foil passes through the dryer at a speed of 8m / min, and the temperature of the dryer is kept at 200°C. After the slurry is dried, the plastic-cured bonding ceramic powder is coated on the surface of the copper foil and bonded together, and the surface is coated with plastic and Copper foil winding of ceramic powder. Aluminum foil coated with plastic and ceramic powder was prepared by the same process and wound up. The thickness of the aluminum foil was 1...

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Abstract

The invention discloses a production method of an MLCC capacitor. The method comprises the following steps: (1) coating a copper foil / aluminum foil with a slurry formed by plastic particles and ceramic particles, and drying to obtain a copper foil composite layer / aluminum foil composite layer; (2) sequentially stacking the copper foil composite layers and the aluminum foil composite layers together at intervals, heating to a softening point of plastic, and rolling to obtain a multi-layer ceramic composite body; and (3) putting one end surface of a multi-layer ceramic composite into a diluted hydrochloric acid to dissolve the aluminum foil near the end surface, and leaving the copper foil; putting the other end surface into a concentrated nitric acid to dissolve the copper foil near the end surface, leaving the aluminum foil, and polishing to remove an aluminum passivation layer; and then, welding the two end surfaces with an external electrode by using tin so that the copper foils are mutually connected into a whole, and the aluminum foils are mutually connected into a whole, and obtaining the MLCC capacitor. According to the production method of the MLCC capacitor, the process is simplified, the energy is saved, and the quality problems of a short circuit, open circuit and the like caused by improper sintering of a nickel powder and a barium titanate powder are avoided.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a method for preparing an MLCC capacitor. Background technique [0002] Today, with the rapid development of the electronic information industry, various electronic information products, such as notebook computers, mobile phones, LCD TVs, and cameras, have brought great convenience to people's lives. The volume of electrical products is getting smaller and smaller than before, and The functions are more and more complete. All of this is due to the miniaturization, high precision and low power consumption of semiconductor components and numerous passive SMD components, which are the core of electrical products, making it possible to miniaturize information products such as household appliances. This puts higher requirements on one of the main passive chip components in the whole machine - metal chip multilayer ceramic capacitor (MLCC capacitor). [0003] Usually, MLCC capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/12H01G4/224
CPCH01G4/1209H01G4/224
Inventor 穆开洪
Owner SUZHOU CHUANGHAO NEW MATERIAL TECH CO LTD
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