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Multilayer ceramic capacitor and method for controlling equivalent series resistance

A technology of equivalent series resistance, ceramic capacitors, applied in the direction of multilayer capacitors, fixed capacitor dielectrics, capacitors, etc., can solve the problems of high electrical connection state, high price, inability to obtain reliability, etc., to ensure weather resistance, avoid thickness The effect of increasing, good weldability

Active Publication Date: 2007-07-04
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to resist sintering in an oxidizing atmosphere, it is necessary to use an expensive noble metal as a material for the internal electrodes of the capacitor body, and Ni or Ni alloys, which are currently mainstream, cannot be used as materials for the internal electrodes.
[0016] In addition, in the case of using a resistance component such as a ruthenium oxide compound that is not reduced as the material for the above-mentioned second conductive layer, since it is impossible to obtain a A highly reliable electrical connection state between them, so a layer for ensuring conduction with internal electrodes is further required
The above-mentioned first conductive layer also has the function of ensuring the conduction with the internal electrodes. Therefore, in the technology described in Patent Document 3, the first to third conductive layers are required, and the thickness of the external electrodes cannot be avoided.

Method used

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  • Multilayer ceramic capacitor and method for controlling equivalent series resistance
  • Multilayer ceramic capacitor and method for controlling equivalent series resistance
  • Multilayer ceramic capacitor and method for controlling equivalent series resistance

Examples

Experimental program
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experiment example 1

[0090] Experimental Example 1 was carried out to confirm the effects of composite oxides reacting with Ni and Ni alloys, especially In-Sn composite oxides and La-Cu composite oxides, which are characteristic configurations of the present invention.

[0091] First, a capacitor body for a multilayer ceramic capacitor designed to contain Ni in its internal electrodes and have a capacitance of 1 μF was prepared by a known method.

[0092] On the other hand, in order to form a conductive layer containing a resistance component, in an example within the scope of the present invention, a paste for a conductive layer was produced as follows.

[0093] First, in the example including the In-Sn composite oxide, according to the SnO 2 powder relative to In 2 o 3 Powder and SnO 2 The total amount of powder is at a content rate of 5% by weight, in In 2 o 3 Mixed SnO in powder 2 powder, temporarily sintered at 1400 °C for 5 hours in the atmosphere, and the SnO 2 After sufficient solid...

experiment example 2

[0108] Experimental Example 2 was carried out to confirm that the ESR of the multilayer ceramic capacitor can be adjusted according to the addition amount of the glass component contained in the conductive layer, the glass softening point, and the addition amount of the conductive metal component.

[0109] (1) ESR adjustment based on the amount of glass components added

[0110]In the above-mentioned Experimental Example 1, in the paste for the conductive layer containing the In-Sn composite oxide prepared as an example, the volume ratio of "In-Sn composite oxide": "glass" was 1:1 (5:5 ), but in addition, the paste for the conductive layer that adopts the volume ratio of 8:2 and the paste for the conductive layer that adopt the volume ratio of 7:3 are produced respectively, and by the same method as the case of Test Example 1, it is made as For the multilayer ceramic capacitors of the samples, ESR was measured on average for 10 samples, the average value and standard deviation...

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Abstract

Disclosed is a preferable structure for an external electrode which is used in a multilayer ceramic capacitor and also serves as a resistor element. The external electrode having such a structure is not reduced even by firing in a reducing atmosphere, thereby allowing an internal electrode to use Ni or a Ni alloy, and realizes good electrical connection with the internal electrode. Specifically disclosed are external electrodes (6, 7) formed on the outer surface of a capacitor main body (2) which respectively have a structure comprising a conductive layer (8) and a metal plating layer (9) formed on the conductive layer (8). The conductive layer (8) has a composition containing a glass component and a complex oxide such as an In-Sn complex oxide that is reactive with Ni or a Ni alloy.

Description

technical field [0001] The present invention relates to a multilayer ceramic capacitor and a method for adjusting its equivalent series resistance, and more particularly, to a multilayer ceramic capacitor having an external electrode also functioning as a resistance element and a method for adjusting its equivalent series resistance. Background technique [0002] Traditionally, capacitors have been classified as follows: multilayer ceramic capacitors are used to eliminate high-frequency voltage fluctuations in smoothing circuits, while tantalum capacitors or aluminum electrolytic capacitors are used to eliminate low-frequency voltage fluctuations. [0003] As mentioned above, multilayer ceramic capacitors are specially used to eliminate high-frequency voltage fluctuations because the equivalent series resistance (ESR) of multilayer ceramic capacitors is smaller than that of tantalum capacitors or aluminum electrolytic capacitors, so the equivalent circuit composition of multi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/12H01G4/30
CPCH01G4/12H01G4/30H01G4/2325
Inventor 草野满洋渡边静晴
Owner MURATA MFG CO LTD
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