Murata Manufacturing Co., Ltd.

Takaharu Miyazaki

Tsuyoshi Yamana

Harunobu Sano

Norihiko Sakamoto

Nobuyuki Wada

Takanori Nakamura

A laminated ceramic electronic component, for example, monolithic ceramic capacitor, in which the delamination does not occur during baking and having superior thermal shock and moisture load resistance characteristics is provided. A conductive paste, used with advantage to form an internal electrode of the laminated ceramic electronic component, and a laminated ceramic electronic component using the conductive paste is provided. The conductive paste is composed of a conductive powder which is primarily Ni, an organic vehicle, a compound A containing at least one of Mg and Ca and which is an organic acid metal salt, oxide powder, metal organic complex salt and/or an alkoxide, and a compound B, having a hydrolyzable reactive group containing at least one of Ti and Zr, which adheres to the surface of the conductive powder.

Conductive paste and laminated ceramic electronic component

A ceramic green sheet having good surface roughness and few pinhole defects even when producing a thin ceramic green sheet is stably produced, to permit efficiently and securely manufacturing a multilayer ceramic electronic part in which deterioration of its life due to unevenness of interfaces between internal electrodes and ceramic layers and the occurrence of structural defects, such as delamination, bending of an electrode portion, etc, in a multilayer thin film to be suppressed. A dry sheet obtained by forming ceramic slurry to a sheet on a carrier film is smoothed by pressing using a plate press, a hydrostatic press or a calender roll under predetermined temperature and pressure conditions to improve the surface smoothness of the ceramic green sheet independently of the particle diameter of the ceramic and its dispersibility. An electrode paste is coated in a predetermine pattern on the thus-produced ceramic green sheet to form a sheet provided with an electrode. A plurality of the sheets provided with electrodes are laminated, and the burned to produce a multilayer ceramic electronic part.

Method of producing ceramic green sheet and method of manufacturing multilayer ceramic electronic part

A ceramic green sheet having good surface roughness and few pinhole defects even when producing a thin ceramic green sheet is stably produced, to permit efficiently and securely manufacturing a multilayer ceramic electronic part in which deterioration of its life due to unevenness of interfaces between internal electrodes and ceramic layers and the occurrence of structural defects, such as delamination, bending of an electrode portion, etc., in a multilayer thin film to be suppressed. A dry sheet obtained by forming ceramic slurry to a sheet on a carrier film is smoothed by pressing using a plate press, a hydrostatic press or a calender roll under predetermined temperature and pressure conditions to improve the surface smoothness of the ceramic green sheet independently of the particle diameter of the ceramic and its dispersibility. An electrode paste is coated in a predetermine pattern on the thus-produced ceramic green sheet to form a sheet provided with an electrode. A plurality of the sheets provided with electrodes are laminated, and the burned to produce a multilayer ceramic electronic part.

A laminated ceramic electronic component, such as a laminated ceramic capacitor, having superior heat shock resistance and humidity loading resistance is provided, in which no delamination occurs during a firing step. A conductive paste advantageously used for forming internal electrodes and a laminated ceramic electronic component using the conductive paste are provided. The conductive paste is a conductive powder primarily composed of Ni; an organic vehicle; a compound A which is at least one of an organic acid metal salt, an organic metal complex salt and an alkoxide, and which contains at least one of Mg, Ca and Ba; and a hydrolyzed compound B containing at least one of Al and Si; wherein the hydrolyzed compound B is adhered to the surface of the conductive powder.

Conductive paste and laminated ceramic electronic component using the same

A monolithic ceramic capacitor includes a plurality of dielectric ceramic layers, a plurality of inner electrodes formed between the dielectric ceramic layers in such a manner that one end of each inner electrode is exposed out of either end of the dielectric ceramic layers, and outer electrodes electrically connected with the exposed inner electrodes; in which the inner electrodes each are made of a base metal, and Si oxide layers or layers comprising an Si oxide and at lest one component that constitutes said dielectric ceramic layers and said inner electrodes are formed adjacent to the inner electrodes. The capacitor has excellent thermal impact resistance and wet load resistance characteristics. A producing method includes firing a green sheet laminate including a metal inner electrode at an oxygen partial pressure of about said equilibrium oxygen partial pressure of the metal to the metal oxide.

Method of producing a monolithic ceramic capacitor

A monolithic ceramic electronic component has a ceramic element including a plurality of ceramic layers and a plurality of internal electrode layers. Each internal electrode layer is disposed between two adjacent ceramic layers. The roughness of the interface between each internal electrode layer and each ceramic layer is about 200 nm or less, and the incidence of pores in the ceramic layer is about 1% or less by area at a polished cut cross-section. The monolithic ceramic electronic component can be a monolithic ceramic capacitor, a monolithic ceramic varistor, a monolithic ceramic piezoelectric component or a monolithic substrate.

Monolithic ceramic electronic component and method for making the same

A monolithic ceramic component has inner electrodes which are thin having a thickness of from about 0.2 &mgr;m to 0.7 min, and thereby, delamination is inhibited even though ceramic layers are thin, having a thickness up to about 3 &mgr;m. The mean particle size of the ceramic grains of the ceramic layers is up to 0.5 &mgr;m, so that the concavities and convexities at the interfaces between the inner electrodes and the ceramic layers can be reduced. Preferably, metal powder in a paste used to form the inner electrodes has a mean particle size of from about 10 to 200 nm, and thereby, the metal filling ratio and the smoothness of the inner electrodes can be enhanced, and the coverage can be improved.

Monolithic ceramic electronic component

A monolithic ceramic capacitor and producing method thereof are disclosed. The ceramic capacitor has a plurality of dielectric ceramic layers, a plurality of inner electrodes formed between the dielectric ceramic layers in such a manner that one end of each inner electrode is exposed out of either end of the dielectric ceramic layers, and outer electrodes electrically connected with the exposed inner electrodes; in which the inner electrodes each are made of a base metal, and Si oxide layers or layers comprising an Si oxide and at least one component that constitutes said dielectric ceramic layers and said inner electrodes are formed adjacent to the inner electrodes. The capacitor has excellent thermal impact resistance and wet load resistance characteristics.

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Shiga-ken, Japan

Takaharu Miyazaki