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Silver paste of MLCC terminal electrode

A terminal electrode and silver paste technology, applied in fixed capacitor electrodes, fixed capacitor parts, fixed capacitor dielectrics, etc., can solve problems such as corner cracking, sagging, and exposed porcelain on the top of the end

Inactive Publication Date: 2010-04-07
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing silver terminal electrode paste always has chronic problems such as exposed porcelain on the top of the terminal, sagging, and corner cracking after sealing.

Method used

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  • Silver paste of MLCC terminal electrode
  • Silver paste of MLCC terminal electrode
  • Silver paste of MLCC terminal electrode

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Experimental program
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Effect test

Embodiment

[0013] According to the No. 1 to No. 9 silver paste formulas in Table 1 and according to the common methods of the paste, such as weighing each formula in proportion for batching→stirring→dispersing→rolling→semi-finished product inspection→slurry mixing→finished product inspection→packaging, the obtained Silver paste for PME-MLCC terminal electrodes. The glass powder is zinc silicon boron barium lead-free glass, and its weight percentage is composed of ZnO 25 ~ 35wt%, SiO 2 16~26wt%, B 2 o 3 15~20wt%, BaO 7~15wt%, CaO 6~13wt%, Al 2 o 3 1~3wt%, K 2 O 1~2wt%, the specific formula of glass powder in the embodiment is as shown in table 2. The average particle size of the glass powder is 1-3 μm. Described inorganic additive is Bi 2 o 3 . The organic carrier is composed of 8-18wt% polymer resin and 72-92wt% solvent. The polymer resin is one or more of ethyl cellulose, rosin resin, and petroleum resin, and the solvent is one or more of terpineol and ethyl carbitol acetat...

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Abstract

The invention discloses a silver paste for an MLCC terminal electrode, comprising the following components by weight percent: 64-76wt% of conductive silver powder, 3-5wt% of glass powder, 1-2wt% of inorganic additive and 20-30wt% of the organic carrier, wherein the preferable weight percentage of conductive silver is 70-74wt%. The glass powder is zinc-silicon-boron-barium series lead-free glass and comprises the following components by weight percent: 25-35wt% of SiO2 16-26wt% of ZnO, 15-20wt% of B2O3, 7-15wt% of BaO, 6-13wt% of CaO, 1-3wt% of Al2O3 and 1-2wt% of K2O, wherein the average particle size of the glass powder obtained by high temperature melting, quenching and ball milling is 1-3 mu m. The sizing agent has good environmental protection property and superior performance. After the silver paste is used for MLCC blocking, the end roof of a capacitor has no pertinacious illness such as ceramic exposing, sagging, turning, cracking and the like, and the compact and full medium-high voltage large-size PME-MLCC silver tip is realized and the product is qualified in various qualified performance tests, thereby meeting the requirements of PME-MLCC production process.

Description

technical field [0001] The invention relates to a silver paste for a terminal electrode of a multilayer ceramic capacitor, which is especially suitable for the terminal electrode of a PME-MLCC. Background technique [0002] During the promulgation and implementation of the EU's two green directives for a long period of time, domestic electronic paste manufacturers failed to fill the gap in time for lead-free electronic paste for components due to limited technical reserves and development platforms. When a large number of multilayer ceramic capacitors MLCC use copper CU electrodes, there are still some high-temperature, high-capacity, large-scale MLCC capacitors that must use silver electrode paste. However, the existing silver terminal electrode paste always has chronic problems such as exposed porcelain on the top of the terminal, sagging, and corner cracking after sealing. [0003] Chinese patent CN1687992 discloses a lead-free silver electrode paste for electrodes of el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/008
CPCH01G4/236H01G4/08
Inventor 余龙华孟淑媛安艳
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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