Dielectric ceramic composition
AssigneeMurata Manufacturing Co., Ltd.
InventorYasutaka Sugimoto
Life of this patent
Estimating the term…
Abstract
A dielectric ceramic composition, making it possible to obtain a dielectric ceramic being able to fire at a low temperature of about 1,100° C. or less, being capable of being co-sintered with low resistance and inexpensive metals such as Ag and Cu, the dielectric constant and the Q value of which is high, and the temperature coefficient of the dielectric constant of which is small, is provided. The dielectric ceramic composition is composed of 100 parts by weight of a primary component having about 22 to 43 parts by weight of TiO2, about 38 to 58 parts by weight of ZrO2 and about 9 to 26 parts by weight of SnO2; and about 3 to 20 parts by weight of glass containing at least B and Si.
Claims13
A ceramic multilayer substrate comprising a ceramic substrate having at least two faces and comprising a plurality of dielectric ceramic layers of which at least one is of a dielectric ceramic composition and a plurality of inner electrodes disposed within said ceramic substrate, wherein said dielectric ceramic composition comprises:
- (a) 100 parts by weight of a primary component comprising about 22 to 43 parts by weight of TiO2, about 38 to 58 parts by weight of ZrO2 and about 9 to 26 parts by weight of SnO2;
- (b) about 3 to 20 parts by weight of glass containing B and Si, wherein said glass contains an alkali oxide, an alkaline-earth metal oxide, zinc oxide, Al2O3, B2O3 and SiO2, and has a composition represented by the following formulae relative to 100 weight %, on a weight % basis of the entity of the glass:
- 10≦SiO2≦60;
- 5≦B2O3≦40;
- 0≦Al2O3≦30;
- 20≦EO ≦70, wherein E is Zn and at least one element selected from Mg, Ca, Sr and Ba;
- 0≦A2O≦15, wherein A is at least one of Li, Na, and K;
- (c) NiO in an amount of up to about 10 parts by weight and Ta2O5 in an amount of up to about 7 parts by weight;
- and
- (d) CuO as an additive in an amount of up to about 7 parts by weight relative to 100 parts by weight of said primary component.
A cermaic multiplayer substrate comprising a cermic substrate having at least two faces and comprising a plurality of dielectric ceramic layers of which at least one is of a dielectric cermic composition and a plurality on inner electrodes disposed within said cermaic substrate, wherein said dielectric ceramic composition comprises 100 parts by weight of a primary component comprising about 22 to 43 parts by weight of TiO2, about 38 to 58 parts by weight of ZrO2 and about 9 to 26 parts by weight of SnO2;
- and about 3 to 20 parts by weight of glass containing B and Si.
A laminated ceramic electronic part comprising a ceramic sintered material of a dielectric ceramic composition, a plurality of inner electrodes disposed in said ceramic sintered material, and a plurality of external electrodes each of which is disposed on an outer surface of said ceramic sintered material and electrically connected to one of inner electrodes, wherein said dielectric ceramic composition comprises:
- (a) 100 parts by weight of a primary component comprising about 22 to 43 parts by weight of TiO2, about 38 to 58 parts by weight of ZrO2 and about 9 to 26 parts by weight of SnO2;
- (b) about 3 to 20 parts by weight of glass containing B and Si, wherein said glass contains an alkali oxide, an alkaline-earth metal oxide, zinc oxide, Al2O3, B2O3 and SiO2, and has a composition represented by the following formulae relative to 100 weight %, on a weight % basis of the entity of the glass:
- 10≦SiO2≦60;
- 5≦B2O3≦40;
- 0≦Al2O3≦30;
- 20≦EO ≦70, wherein E is Zn and at least one element selected from Mg, Ca, Sr and Ba;
- and
- 0≦A2O≦15, wherein A is at least one of Li, Na, and K;
- (c) NiO in an amount of up to about 10 parts by weights and Ta2O5 in an amount of up to about 7 parts by weight;
- and
- (d) CuO as an additive in an amount of up to about 7 parts by weight relative to 100 parts by weight of said primary component.
A laminated ceramic electronic part comprising a ceramic sintered material of a dielectric ceramic composition, a plurality of inner electrodes disposed in said ceramic sintered material, and a plurality of external electrodes each of which is disposed on an outer surface of said dielectric ceramic sintered material and electrically connected to one of inner electrodes, wherein said ceramic composition comprises 100 parts by weight of a primary component comprising about 22 to 43 parts by weight of TiO2, about 38 to 58 parts by weight of ZrO2 and about 9 to 26 parts by weight of SnO2;
- and about 3 to 20 parts by weight glass containing B and Si.
Dependencies are inferred from the claim text.