COG dielectric composition for use with nickel electrodes

A technology of dielectric and composition, applied in the field of zirconium titanate-based dielectric composition, can solve problems such as capacitance aging, and achieve the effects of stable dielectric constant, small dielectric loss and high reliability

Active Publication Date: 2008-09-24
FELLOWES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

COG components exhibit no capacitance aging

Method used

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  • COG dielectric composition for use with nickel electrodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The dielectric composition referred to as Precursor 1 was formed by mixing, compounding and / or milling the appropriate amount of oxides as shown in Table 6 in water. Mix the powder with 1% of C (a polymer suspending agent available from RT Vanderbilt Co., Inc., Norwalk, Connecticut) was mixed. Bead mill the mixed powder to particle size D with 0.5mm YTZ (stabilized yttrium zirconia) 50 is about 0.65 microns. The powder was calcined at 1200°C for 5 hours. Then, the calcined powder was pulverized by a conventional method to obtain a precursor 1 .

[0052] Table 6. Formulation of Precursor 1 before calcination

[0053] SrCO 3

ZrO 2

TiO 2

wt%

54.901

43.761

1.337

[0054] Additionally, after calcination, the composition of Precursor 1 can be represented by the following formula: SrZr 0.955 Ti 0.045 o 3 . According to the formula in Table 7, 2MgO·3B 2 o 3 (as Mg(OH) 2 and H 3 BO 3 combination) was added t...

Embodiment 2

[0068] According to Table 11, the Mg(OH) 2 , CaCO 3 、Al 2 o 3 and SiO 2 The mixture of is added to the precursor 1 as a sintering aid (after sintering to efficiently produce MgO-CaO-Al 2 o 3 -SiO 2 ). The powder was processed according to Example 1.

[0069] Table 11. Recipe for the dielectric of Example 2 prior to firing

[0070] precursor 1

Mg(OH) 2

CaCO 3

Al 2 o 3

SiO 2

wt%

97.812

0.257

0.257

0.579

1.096

[0071] The powder of Example 2 has the general formula which can alternatively be expressed as: 98.003 wt% SrZr 0.955 Ti 0.045 o 3 +0.178wt% MgO+0.144wt% CaO+0.579wt% Al 2 o 3 +1.096wt% SiO 2 . Example 2 has the formulation of Table 12 when expressed as a simple oxide.

[0072] Table 12. Oxide composition of the dielectric powder of Example 2

[0073] SrO

ZrO 2

TiO 2

MgO

CaO

Al 2 o 3

SiO 2

wt%

45.156

51.281

...

Embodiment 3-14

[0078] Various amounts of mixtures including MgO, CaO, Al 2 o 3 , SiO 2 And / or any one or all of SrO. Since the sintering aid in Examples 12, 13 and 14 also contained SrO, the total SrO in these examples was derived from both Precursor 1 and the sintering aid. For Examples 3-14, the total weight of Precursor 1 is the first three columns (SrO, ZrO 2 and TiO 2 )Sum. The composition and MLCC electrical properties of Example 2 are also included in Tables 14 and 15 for ease of comparison.

[0079] Table 14. Oxide composition (expressed in wt %) of the powders of Examples 2-14

[0080] implement

[0081] The final powders of Examples 3-14 were processed according to the procedure of Example 1 to prepare MLCC flakes for electrical testing. Firing conditions and electrical properties are summarized in Table 15. Each MLCC was fired for 2 hours.

[0082] Table 15. Firing conditions and electrical properties of MLCCs of Examples 2d-15

[0083] Example

[008...

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Abstract

Multilayer ceramic chip capacitors which satisfy COG requirements and which are compatible with reducing atmosphere sintering conditions so that non-noble metals such as nickel and nickel alloys thereof may be used for internal and external electrodes are made in accordance with the invention. The capacitors exhibit desirable dielectric properties (high capacitance, low dissipation factor, high insulation resistance), excellent performance on highly accelerated life testing, and very good resistance to dielectric breakdown. The dielectric layers comprise a strontium ztrconate matrix doped with other metal oxides such as TiO2, MgO, B2O3, CaO, A12O3 SiO2, and SrO in various combinations. Figure 1 is a cross-sectional view of a multilayer ceramic chip capacitor (1) according to an embodiment of the invention External electrodes (4) of the capacitor (1) are disposed on side surfaces of the capacitor chip (1) and in electrical connection with internal electrode layers (3). The capacitor chip (1) has a plurality of alternately stacked dielectric layers (2).

Description

technical field [0001] The present invention relates to zirconate-titanate-based dielectric compositions, and more particularly, to strontium zirconate-titanate-based dielectric compositions that can be used to form multilayer ceramic sheets having base metal internal electrodes formed of nickel or nickel alloys shape capacitor. Background technique [0002] Multilayer ceramic chip capacitors have been widely used as miniature, high-capacity, and high-reliability electronic components. With the increasing demand for high-performance electronic equipment, multilayer ceramic chip capacitors are also facing market demands for smaller size, higher capacity, lower cost, and higher reliability. [0003] Multilayer ceramic chip capacitors are generally produced by forming alternating layers of an internal electrode-forming paste and a dielectric layer-forming paste. The layers are typically formed by sheeting, printing or similar techniques followed by simultaneous firing. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/14C03C4/16C03C8/14H01B3/08H01G4/018H01G4/12H01G4/30H01G4/33H05K1/03
CPCH01G4/30H01G4/1236H01G4/1245C03C3/14C03C4/16C03C8/14H01B3/08
Inventor 小沃尔特·J.·赛姆斯莫哈米德·H.·梅盖尔希伊丽莎白·W.·J.·罗默麦克·S.·H.·舒威利布罗德斯·J.·L.·M.·J.·科庞
Owner FELLOWES INC
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