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Non-reduction medium ceramic and monolithic ceramic capaciter

A technology of ceramic capacitors and dielectric ceramics, applied in capacitors, laminated capacitors, fixed capacitors, etc., can solve the problems of reduced insulation resistance and reduced reliability

Inactive Publication Date: 2005-08-24
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when a monolithic ceramic capacitor obtained by firing at such a low oxygen partial pressure is used under high voltage DC, the insulation resistance decreases and the reliability also decreases, which is disadvantageous

Method used

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  • Non-reduction medium ceramic and monolithic ceramic capaciter
  • Non-reduction medium ceramic and monolithic ceramic capaciter
  • Non-reduction medium ceramic and monolithic ceramic capaciter

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Embodiment Construction

[0024] figure 1 is a sectional view showing the monolithic ceramic capacitor 1 of the present invention, and figure 2 yes figure 1 An assembly view of the ceramic laminate 3 provided in the monolithic ceramic capacitor 1 shown.

[0025] A monolithic ceramic capacitor 1 includes a rectangular ceramic laminate 3 obtained by laminating a plurality of dielectric ceramic layers 2a and 2b and sandwiching internal electrodes 4 therebetween. External electrodes 5 are formed on each side of the ceramic laminated body 3 so as to be electrically connected to specific internal electrodes. A first plating layer 6 made of nickel, copper, or the like is formed on the external electrode 5 , and a second plating layer 7 of solder, tin, or the like is formed on the external electrode 5 .

[0026] Next, the manufacturing method of the monolithic ceramic capacitor 1 will be described in sequence.

[0027] First, a barium titanate-based raw powder is prepared as a main component of the dielec...

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Abstract

A nonreducing dielectric ceramic has a perovskite structure represented by the formula ABO3 with a principal crystal phase comprising barium titanate as a principal constituent. The crystal axis ratio c / a determined by an X-ray diffraction method at a temperature of 25 DEG C. or more satisfies the relationship 1.000 H01B 3 / 12 C04B 35 / 468 H01G 4 / 12 H01G 4 / 008 H01G 4 / 30 1 10 0 2000 / 5 / 24 1274931 2000 / 11 / 29 1216382 2005 / 8 / 24 2005 / 8 / 24 2005 / 8 / 24 Murata Manufacturing Co., Ltd. Japan Mizuno Tsugutada Nakamura Tomoyuki Sano Harunobu shen zhaokun 31100 Shanghai Patent Agency Building 34--35, No.2650 Zhongshan North Road, Shanghai 200063 Japan 1999 / 5 / 24 142742 / 99

Description

technical field [0001] The present invention relates to a nonreducing dielectric ceramic and a monolithic ceramic capacitor provided with a dielectric ceramic layer composed of the nonreducing dielectric ceramic. In particular, the present invention relates to a monolithic ceramic capacitor which can be advantageously used under conditions of high frequency AC or high to medium voltage DC, and is provided with internal electrodes composed of alkali metals, and also relates to a method for composing such a monolithic A non-reducing dielectric ceramic for the dielectric ceramic layer of a ceramic capacitor. Background technique [0002] Conventional monolithic capacitors are usually fabricated as follows. [0003] First, a plurality of ceramic green sheets containing a dielectric material for forming a dielectric ceramic layer are prepared, wherein the surface of each ceramic green sheet is covered with an electrode material for forming internal electrodes. As the electrode ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/46C04B35/468H01B3/12H01G4/12H01G4/30
CPCH01G4/1227C04B35/4682H01G4/12
Inventor 水埜嗣伸中村友幸佐野晴信
Owner MURATA MFG CO LTD
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