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Dielectric ceramic composition and dielectric ceramic

A technology of dielectric ceramics and compositions, which is applied in the field of dielectric ceramic compositions and dielectric ceramics, can solve problems such as cracking, increasing the temperature coefficient of electrostatic capacity, and failure to obtain conductive properties, so as to prevent bending, deformation, and fading Effect

Inactive Publication Date: 2003-08-13
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the dielectric ceramic composition described in Unexamined Patent Application (Kokai) No. 2001-348268 exhibits low dielectric loss, because the temperature coefficient of the resonant frequency of this dielectric ceramic is large, the effect of electrostatic capacity is increased. temperature coefficient, so the desired conductivity characteristics in line with the operating environment cannot be obtained
Because of its low mechanical strength, it is easy to break due to falling impact of electronic equipment using this dielectric ceramic

Method used

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  • Dielectric ceramic composition and dielectric ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] First, glass frits A and B, which are crystallized glass frits capable of depositing diopside crystals and having an average particle size of 2 μm, were used as glass frits. Glass frit A: 45 wt% SiO 2 -25wt%CaO-15wt%MgO-10wt%ZnO-5wt%Al 2 o 3 Frit B: 49 wt% SiO 2 -28wt%CaO-18wt%MgO-5wt%Al 2 o 3

[0054] Use CaTiO with an average particle size of 2 μm and a purity of 99% or higher 3 Powder and Al with an average particle size of 2 μm each 2 o 3 ,TiO 2 , ZrO 2 , MgTiO 3 , BaTi 4 o 9 , La 2 Ti 2 o 7 ,Nd 2 Ti 2 o 7 , Ca 2 Nb 2 o 7 , SrZrO 3 and CaZrO 3 as a filler. Weigh each component respectively, and mix with water according to the ratio shown in Table 1, when using ZrO 2 The balls were wet-treated in a ball mill for 20 hours to obtain a pulverized mixture having a particle size of 1.5 µm or less.

[0055] As a comparative example, a crystallized glass powder (glass frit C: 50% by weight of SiO2) that cannot deposit diopside crystals was used. 2...

Embodiment 2

[0068] Using the same method as in Example 1, except that the calcium titanate powder used as raw powder in Example 1 was replaced with strontium titanate powder (purity: 99% or higher) having an average particle size of 2 μm, a dielectric material was produced and evaluated. ceramics. The composition is listed in Table 3 and the evaluation results are shown in Table 4.

[0069]

serial number

Glass

ST**

(weight%)

Filler composition (weight%)***

Roasting temperature

℃

components

weight%

AL

Ti

Zr

MT

BT

LT

NT

CN

SZ

CZ

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

*50

51

52

*53

*54

A

A

A

A

A

A

B...

Embodiment 3

[0075] Adopt the same method as embodiment 1, just replace the calcium titanate powder used as raw powder in embodiment 1 with the calcium titanate powder and the strontium titanate powder of 2 μm, 99% or higher purity respectively with average particle size, Fabricate and evaluate dielectric ceramics. The composition is listed in Table 5 and the evaluation results are shown in Table 4.

[0076] Preface

No

Glass

CT**

(weight%)

ST**

(weight%)

Filler composition (weight%)***

roasting

temperature

℃

components

weight%

AL

Ti

Zr

MT

BT

LT

NT

CN

SZ

CZ

55

56

57

58

59

60

61

B

B

B

B

B

A

A

58

58

48

48

72

60

55

3

1

1

1

7

4

4

4

6

20

39

1

1 ...

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Abstract

The present invention provides a dielectric ceramic composition comprising: 30 to 90% by weight of a crystallized glass powder capable of depositing a diopside crystal, 1 to 40% by weight of a calcium titanate powder, a strontium titanate powder or a mixed powder thereof, and 0 to 60% by weight of at least one kind of a powder selected from the group consisting of Al2O3, TiO2, ZrO2, MgTiO3, BaTi4O9, La2Ti2O7, Nd2Ti2O7, Ca2Nb2O7, SrZrO3 and CaZrO3, and a dielectric ceramics obtained by firing the same.

Description

technical field [0001] The present invention relates to a dielectric ceramic composition and dielectric ceramics, and more particularly, to such a dielectric ceramic composition and dielectric ceramics which exhibit 8 to 8 in high frequency regions such as microwave or millimeter wave The relative permittivity of 22, compared with conventional glass ceramics, also has higher mechanical strength and high-precision temperature coefficient. Background technique [0002] So far, dielectric ceramics have been widely used as dielectric base materials for dielectric resonators, MICs (microphones), and waveguides for high-frequency applications such as microwave or millimeter waves. With the development and spread of mobile communications including mobile phones in recent years, the demand for dielectric ceramics used as materials for electronic circuit boards and electronic parts has been increasing. [0003] So-called glass-ceramics made of glass have been developed, which can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C8/20C03C10/04C04B35/22
CPCC04B2235/3239C04B2235/3267C04B2235/3281C04B2235/3206C04B2235/36C04B2235/3229C04B2235/3217C04B2235/3277C04B2235/80C04B2235/6025C04B2235/3213C04B2235/9661C04B2235/9607C04B2235/3279C04B2235/96C04B2235/3291C04B2235/3262C04B2235/3224C04B2235/3272C04B2235/3234C03C8/20C04B2235/3418C04B2235/3284C04B2235/3463C04B35/22C04B2235/3208C04B2235/3427C04B2235/3227C04B2235/3248C04B2235/656C04B2235/3289C04B2235/3241C04B2235/3258C04B2235/5436C04B2235/3481C04B35/465C04B2235/3255C04B2235/3225C04B2235/3256C04B2235/3236C04B2235/3244C04B2235/3275C03C8/14C04B35/14H01B3/12
Inventor 古濑辰治平原诚一郎中泽秀司大出泰儿嶋知将关根史明牧野浩米仓学
Owner KYOCERA CORP
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