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Dielectric ceramic composition and the production method

A ceramic composition and manufacturing method technology, applied in capacitor manufacturing, fixed capacitor dielectrics, ceramics, etc., can solve the problems of high temperature load life deterioration and other problems, achieve high temperature accelerated life, high reliability, maintain Q value and insulation resistance. Effect

Inactive Publication Date: 2007-08-29
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this paper, since the evaporation of Li during sintering is suppressed to some extent, but on the other hand, Li is in CaZrO during sintering 3 It is a solid solution in the matrix, and as a result, there is a problem that the high-temperature load life deteriorates

Method used

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  • Dielectric ceramic composition and the production method
  • Dielectric ceramic composition and the production method
  • Dielectric ceramic composition and the production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] First, in order to finally obtain the composition formula (Ca 0.70 Sr 0.30 )O-(Zr 0.97 Ti 0.03 )O 2 Represented dielectric oxide, blending each oxide and carbonate (CaCO 3 , SrCO 3 , ZrO 2 、TiO 2 ), to obtain the main component raw materials.

[0101] Then, 3 mol of Li-W-B-Si-O glass as a sintering aid prepared in advance was added to 100 mol of the obtained main component raw material, wet mixed in a ball mill, and dried to obtain a dielectric ceramic composition raw material. Furthermore, Li-W-B-Si-O glass as a sintering aid was produced as follows. That is, first, in order to obtain a predetermined composition, the oxides of each component, that is, Li 2 O. WO 3 , B 2 o 3 and SiO 2 . Then, it was subjected to wet mixing and pulverization in a ball mill for 16 hours, then evaporated and dried, and the dried powder was sintered at 1000° C. in air for 2 hours. Thereafter, fine pulverization is performed to obtain glass component powder having an average ...

Embodiment 2

[0131] In addition to using Li-V-B-Si-O glass (Li 2 O: 11 parts by weight; V 2 o 5 : 6 parts by weight; B 2 o 3 : 23 parts by weight and SiO 2 : 60 parts by weight) except as a sintering aid, a capacitor sample was produced in the same manner as in Example 1, and evaluated in the same manner as in Example 1. In addition, in Example 2, when producing each sample, the heating rate during sintering was each rate shown in Table 2, and a total of 5 types of samples were produced. The results are shown in Table 2.

[0132] Table 2

[0133] sample

serial number

second component

Liter during sintering

Temperature speed [℃ /

Hour]

Content of V element

Q value

IR

[Ω]

HALT

[Hour]

T 15

[％]

T 30

[％]

T 60

[％]

11

comparative example

V 2 o 5

100

83.7

82.3

80.9

5,023 ...

Embodiment 3

[0137] In addition to using Li-Mo-B-Si-O glass (Li 2 O: 11 parts by weight; MoO 3 : 6 parts by weight; B 2 o 3 : 23 parts by weight and SiO 2: 60 parts by weight) except as a sintering aid, a capacitor sample was produced in the same manner as in Example 1, and evaluated in the same manner as in Example 1. In addition, in Example 3, when producing each sample, the temperature increase rate during sintering was each rate shown in Table 3, and a total of 5 types of samples were produced. The results are shown in Table 3.

[0138] table 3

[0139]

sample

serial number

second component

Liter during sintering

Temperature speed [℃ /

Hour]

Mo element content

Q value

IR

[Ω]

HALT

[Hour]

T 15

[％]

T 30

[％]

T 50

[％]

16

comparative example

MoO 3

100

84.3

83.4

82.1 ...

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PUM

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Abstract

A dielectric ceramic composition, comprising a main component including a dielectric oxide, and a sintering auxiliary comprising a first component including an oxide of Li and a second component including an oxide of M1 (note that M1 is at least one kind of element selected from group V elements and VI group elements): wherein said dielectric ceramic composition comprises a plurality of dielectric particles and crystal grain boundaries existing between said dielectric particles next to each other; concentration of M1 element becomes lower from a particle surface to inside thereof in the plurality of dielectric particles; and when assuming that a particle diameter of said dielectric particles is D and a content ratio of the M1 element at said crystal grain boundaries is 100%, a content ratio of the M1 element at a depth T 50 , where a depth from the particle surface is 50% of said particle diameter D, is 3 to 55%.

Description

technical field [0001] The present invention relates to a dielectric ceramic composition used for a dielectric layer of an electronic component such as a laminated ceramic capacitor and a method for producing the same. Background technique [0002] As an example of electronic parts, existing dielectric ceramic compositions constituting multilayer ceramic capacitors have main components containing various dielectric oxides as follows: Barium titanate (BaTiO 3 ), strontium titanate (SrTiO 3 ), calcium titanate (CaTiO 3 ), calcium strontium zirconate (CaSrZrO 3 ), calcium zirconate (CaZrO 3 ), strontium zirconate (SrZrO 3 ), titanium oxide (TiO 2 ), neodymium titanate (NdTiO 3 )wait. [0003] Since this dielectric ceramic composition is difficult to directly sinter, various sintering aids are added and sintered at a temperature exceeding 1300°C. In addition, when this dielectric ceramic composition is sintered in a neutral atmosphere or a reducing atmosphere with a low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/12H01G4/30C04B35/49H01B3/12H01L41/083H01L41/187H01L41/22H01L41/39
CPCC04B2235/3239H01G4/1227H01G4/30H01G4/1209C04B2235/3203C04B35/49C04B2235/3258C04B2235/6025C04B2235/5436C04B2235/3208C04B2235/365C04B2235/3213C04B2235/3256H01B3/10
Inventor 渡边康夫
Owner TDK CORPARATION
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