IP Library Granted Patent US 7,916,451
Granted Patent B2
US 7,916,451 · App. 12/482,563 · Granted Mar 29, 2011

C0G multi-layered ceramic capacitor

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Quick Facts
Patent No.
US 7,916,451
App. No.
12/482,563
Granted
Mar 29, 2011
Kind
B2
Abstract

A dielectric ceramic composition in a multilayer ceramic capacitor with a composition of formula: {[(CaO) t (SrO) 1-t ] m [(ZrO 2 ) v (TiO 2 ) 1-v ]} 1-s-x A s E x wherein: A is a transition metal oxide; E is an oxide of an element selected from the group consisting of Ge, Si, Ga and combinations thereof; m is 0.98 to 1.02; t is 0.50 to 0.90; v is 0.8 to 1.0; s and x are selected from the group consisting of: a) 0≦x≦0.08, 0.0001≦s≦0.043 and x≧1.86 s ; and b) 0≦x≦0.0533, 0.0001≦s≦0.08 and x≦0.667 s.

Claims (19)

1. A capacitor formed by the method of:

milling to a D50 of less than 1.0 μm a material consisting essentially of:

[(CaO) t (SrO) 1-t ] m [(ZrO 2 ) v (TiO 2 ) 1-v ]

wherein m is 0.98 to 1.02; and

t is ≧0.50 to 0.90; and

v is 0.8 to 1.0;

thereby forming a first component (C1);

milling a material consisting essentially of at least one of MnO 2 , MnCO 3 or another oxidized form of Mn to a D50 of less than 1.0 μm thereby forming a second component (C2);

milling a material consisting essentially of SiO 2 to a D50 of less than 0.50 μm thereby forming a third component (C3);

forming a coating solution comprising a solvent and a ceramic component consisting essentially of said first component, said second component and said third component in a ratio C1 1-α-β C2 α C3 β ;

applying said coating solution to a tape in an amount selected from the group consisting of a) sufficient to form a ceramic layer over 4.5 μm thick wherein α and β are defined as 0.000186≦β≦0.08, 0.0001≦α≦0.043 and β>1.86α; and b) sufficient to form a ceramic layer of no more than 4.5 μm thick wherein α and β are defined as 0.0000667≦β≦0.0533, 0.0001≦α≦0.08 and β<0.667α;

drying said coating solution to form a green coating;

depositing an ink comprising electrode material over said green coating to form electroded green layers;

stacking non-electroded green layers and electroded green layers to form a green capacitor stack;

dicing said capacitor stack to form singular green multilayer chips;

firing said singular green multilayer chips in an atmosphere with a PO 2 of 10 −6 to 10 −16 atm; and

forming terminals in electrical contact with said electrode material.

2. The capacitor according to claim 1 which has a temperature coefficient of capacitance of ≦+/−30 ppm/° C.

3. The capacitor according to claim 1 wherein said firing is at a temperature not to exceed 1350° C.

Assignments (5)
RELEASE OF SECURITY INTEREST Recorded Nov 8, 2018
From: BANK OF AMERICA, N.A.
To: KEMET CORPORATION,; KEMET ELECTRONICS CORPORATION; KEMET BLUE POWDER CORPORATION
Reel/Frame 047450/0926 →
SECURITY AGREEMENT Recorded May 22, 2017
From: KEMET CORPORATION; KEMET ELECTRONICS CORPORATION; KEMET BLUE POWDER CORPORATION
To: BANK OF AMERICA, N.A., AS COLLATERAL AGENT
Reel/Frame 042523/0639 →
SECURITY AGREEMENT Recorded Mar 19, 2013
From: KEMET ELECTRONICS CORPORATION
To: BANK OF AMERICA, N.A.
Reel/Frame 030055/0049 →
SECURITY INTEREST Recorded Oct 5, 2010
From: KEMET ELECTRONICS CORPORATION
To: BANK OF AMERICA, N.A. AS AGENT
Reel/Frame 025150/0023 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 11, 2009
From: RANDALL, MICHAEL S.; ANTONIADES, COREY; BARBER, DANIEL E.; XU, ZILIN; BEESON, JAMES; PINCELOUP, PASCAL; GURAV, ABHIJIT; POOLE, THOMAS; TAJUDDIN, AZIZUDDIN; BURN, IAN
To: KEMET ELECTRONICS CORPORATION
Reel/Frame 022811/0813 →