Multilayer ceramic capacitor and method for manufacturing same

Details Multilayer ceramic capacitor and method for manufacturing same Multilayer ceramic capacitor and method for manufacturing same

2001-03-30

2004-01-06

Jones, Deborah (Department: 1775)

Stock material or miscellaneous articles

Composite

Of metal

C428S697000, C428S701000, C428S702000, C361S312000, C361S314000, C361S320000, C361S321100, C361S321200, C361S321500

Reexamination Certificate

active

06673461

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a multilayer ceramic capacitor; and, more particularly, to a miniaturized large capacitance multilayer ceramic capacitor with an increased operating life and a method for manufacturing same, wherein the miniaturization and large capacitance are achieved by scaling down the thickness of the dielectric layers employed in the multilayer ceramic capacitor and stacking a greater number of the scaled-down dielectric layers.
BACKGROUND OF THE INVENTION
In general, as shown in
FIG. 1
, a multilayer ceramic capacitor
10
includes a ceramic body
12
having a pair of external electrodes
14
A and
14
B respectively formed at two opposite end portions thereof. The ceramic body
12
is fabricated by sintering a laminated body formed of alternately stacked dielectric layers
16
and internal electrodes
18
. Each pair of neighboring internal electrodes
18
faces each other with a dielectric layer
16
intervened therebetween and is electrically coupled to different external electrodes
14
A and
14
B, respectively.
The dielectric layers
16
are made of a reduction resistive ceramic compound including, e.g., barium titanate (BT) as a major component and an oxide of rare-earth elements. The internal electrodes
18
are formed by sintering a conductive paste whose main component is, e.g., Ni metal powder.
The ceramic body
12
is produced by forming a chip-shaped laminated body with alternately stacked ceramic green sheets and internal electrode patterns, removing a binder off the chip-shaped laminated body, sintering the binder removed laminated body in a non-oxidative atmosphere at a high temperature ranging from 1200° C. to 1300° C., and finally re-oxidizing the sintered laminated body in an oxidative atmosphere.
Recent trend for ever more miniaturized and dense electric circuits demands for a further scaled-down multilayer ceramic capacitor with higher capacitance. Keeping up with such demand, there has been made an effort to fabricate thinner dielectric layers and to stack a greater number of the smaller-sized dielectric layers.
However, when the dielectric layers of the multilayer ceramic capacitor are thinned out, the electric field intensity per one layer increases and, thus, the operating life of the multilayer ceramic capacitor becomes shortened.
SUMMARY OF THE INVENTION
It is, therefore, a primary object of the present invention to provide a miniaturized large capacitance multilayer ceramic capacitor with a desired operating life and a method for manufacturing same, wherein the miniaturization and large capacitance of the multilayer ceramic capacitor are achieved by scaling down the thickness of the dielectric layers in the multilayer ceramic capacitor and stacking a greater number of the scaled-down dielectric layers.
In accordance with one aspect of the present invention, there is provided a multilayer ceramic capacitor formed by alternately stacking a plurality of dielectric layers and a multiplicity of internal electrodes, which are connected to a pair of external electrodes, wherein each of the dielectric layers is obtained from a dielectric ceramic compound composed of ceramic grains and a glass component connecting the ceramic grains and the glass component contains one or more additive elements selected from the group consisting of Mn, V, Cr, Mo, Fe, Ni, Cu and Co.
In accordance with another aspect of the present invention, there is provided a method for manufacturing a multilayer ceramic capacitor, including the steps of:
forming a ceramic slurry;
forming ceramic green sheets from the ceramic slurry;
printing internal electrode patterns on the ceramic green sheets;
generating a laminated body by stacking the ceramic green sheets provided with the internal electrode patterns printed thereon;
dicing the laminated body to thereby form chip-shaped ceramic bodies; and
sintering the chip-shaped ceramic bodies, wherein the ceramic slurry includes a glass component containing one or more additive elements selected from the group consisting of Mn, V, Cr, Mo, Fe, Ni, Cu and Co.


REFERENCES:
patent: 4027209 (1977-05-01), Maher
patent: 5521332 (1996-05-01), Shikata et al.
patent: 2001/0055193 (2001-12-01), Chazono et al.
patent: 07029764 (1995-01-01), None
patent: 08228078 (1996-09-01), None
patent: 08295558 (1996-11-01), None
patent: 08298380 (1996-11-01), None

Affiliated with

Also associated with

Rating

Multilayer ceramic capacitor and method for manufacturing same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multilayer ceramic capacitor and method for manufacturing same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multilayer ceramic capacitor and method for manufacturing same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3206856