Unlock instant, AI-driven research and patent intelligence for your innovation.

Terminal electrod composition for multilayer ceramic capacitor

A technology of multilayer capacitors and composites, applied in the directions of fixed capacitor electrodes, laminated capacitors, fixed capacitor leads, etc., can solve problems such as low reliability, insufficient strength and bending strength, and cracks in capacitor assemblies to ensure reliability , Ease of welding operation

Inactive Publication Date: 2004-08-04
EI DU PONT DE NEMOURS & CO
View PDF1 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there have been problems of cracks in the capacitor assembly due to rapid temperature changes during the process of soldering the chip capacitors to the circuit board or during soldering repairs, and the occurrence of cracks in the capacitor assembly when the base material is bent due to externally applied pressure on it. Bending force to form cracks in the capacitor
[0004] As mentioned above, since the conductive paste needs to have a relatively high sintering temperature when used for terminal electrodes, its thermal shock resistance is low during soldering and related processes.
In addition, their strength (i.e. bending strength) is not sufficient so that the circuit board on which the chip capacitor is mounted cannot be wound or bent
Therefore, cracks are prone to occur due to stress inside the capacitor assembly during sintering, resulting in low reliability
When the conductive paste is sintered at a lower temperature of 650-780°C, although the bending strength is improved, its density is not enough, and other properties of the chip capacitor are low, and it is impossible to obtain good reliability

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Spherical copper powder (71.1% by weight) with an average particle size of 3 microns, SnO 2 Powder (0.7% by weight), glass frit (10.2% by weight) and organic vehicle (18% by weight) (22% by weight of methyl methacrylate with a weight average molecular weight of 200,000 in 78% by weight of butyl carbitol acetate solution) and mixed in a three-roll mill to disperse evenly to obtain a paste.

[0022] The glass frit used has the following composition by weight: 35.0% BaO, 23.1% B2O 3 , 13.5% SrO, 12.5% ​​SiO 2 , 4.5% ZnO, 3.7% MgO, 2.4% Al2O 3 , 2.3% Na2O, 1.2% SnO 2 , 1.0%TiO 2 , 0.4% K2O and 0.4% LiO.

Embodiment 2

[0024] Spherical copper powder (70% by weight) with an average particle size of 3 microns, SnO 2 The powder (2 wt %), the glass frit of Example 1 (10 wt %), and the organic vehicle (18 wt %) were weighed and mixed in a three-roll mill for uniform dispersion to form a paste.

Embodiment 3

[0026] Spherical copper powder (70.9% by weight) with an average particle size of 3 microns, V 2 o 5 The powder (1.0 wt %), the glass frit of Example 1 (10.1 wt %), and the organic vehicle (18 wt %) were weighed and mixed in a three-roll mill for uniform dispersion to form a paste.

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
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
softening pointaaaaaaaaaa
Login to View More

Abstract

The present invention relates to terminal electrode compositions for multilayer ceramic capacitors. More specifically, it relates to terminal electrode compositions for multilayer ceramic capacitors which have a metal oxide component selected from SnO2, V2O5 and MoO3. The compositions can be fired at a low temperature in a nitrogen atmosphere.

Description

technical field [0001] This invention relates to terminal electrode compositions for multilayer ceramic capacitors. More particularly, the present invention relates to a terminal electrode composition for a multilayer ceramic capacitor, which comprises matrix metal powder, glass frit and metal oxide, and which can be sintered at a low temperature in a nitrogen atmosphere. technical background [0002] A conductive paste containing a matrix metal such as copper or nickel and an inorganic binder dispersed in an organic binder is widely used as a material for a terminal electrode of a multilayer ceramic capacitor. These conductive pastes must be conductive after sintering and require good adhesion to the capacitor assembly before and after the sintering process. For example, US Patent No. 3,922,387 discloses compositions comprising noble metals and nickel oxide additives for improved adhesion. [0003] With the development of high-density surface mount technology over the pas...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/12C09D5/24C09J9/02C22C1/05H01B1/00H01B1/22H01G4/008H01G4/228H01G4/232H01G4/30
CPCH01G4/2325H01B1/22H01G4/30C03C8/18
Inventor 松野久曾雌浩之
Owner EI DU PONT DE NEMOURS & CO