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Dielectric ceramic composition, process for producing the same, dielectric ceramic employing it and multilayer ceramic component

A technology of dielectric ceramics and composites, which is applied to parts of fixed capacitors, ceramics, and dielectrics of fixed capacitors. It can solve the problems of characteristic changes and poor yields, and achieve the effect of small dielectric loss.

Inactive Publication Date: 2008-04-02
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The change and difference in characteristics due to changes in sintering temperature and composition cause deterioration in yield in mass production

Method used

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  • Dielectric ceramic composition, process for producing the same, dielectric ceramic employing it and multilayer ceramic component
  • Dielectric ceramic composition, process for producing the same, dielectric ceramic employing it and multilayer ceramic component

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no. 1 approach

[0033] The dielectric ceramic composition of the first embodiment of the present invention will be specifically described as follows.

[0034] The composition of the present invention is a dielectric ceramic composition comprising a main component and a glass component, the main component containing Zn 2 TiO 4 , ZnTiO 3 and TiO as an optional ingredient 2 . The main component is represented by the general formula x'Zn 2 TiO 4 -(1-x’-y’)ZnTiO 3 -y'TiO 2 where x' is in the range of 0.152 o 3 , 6-15 wt% SiO 2 , 0.5-5 wt% Al 2 o 3 , and 3-10% by weight of BaO. The dielectric ceramic composition of the present invention contains 3-30 parts by weight of the glass component per 100 parts by weight of the main component.

[0035] In the above composition, x' should preferably be greater than 0.15 and less than 0.8. For the case where x’ is less than or equal to 0.15 or greater than or equal to 0.8, τ f The absolute value may exceed 50 ppm / °C, which is not desirable.

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no. 2 approach

[0050] Hereinafter, a dielectric ceramic composition according to a second embodiment of the present invention will be described in detail.

[0051] The composition of the present invention is a dielectric ceramic composition comprising a main component and a glass component, the main component containing Zn 2 TiO 4 , ZnTiO 3 and Al 2 o 3 and TiO as an optional ingredient 2 . The principal component is given by the general formula xZn 2 TiO 4 -yZnTiO 3 -zTiO 2 -wAl 2 o 3 Indicates that x is in the range of 0.152 TiO 4 , ZnTiO 3 、Al 2 o 3 and TiO 2 Each has a crystalline form. On the other hand, the glass composition may contain 50-75% by weight ZnO and 5-30% by weight B 2 o 3 glass. In the dielectric ceramic composition of the present invention, every 100 parts by weight of the main component corresponds to 3-30 parts by weight of the glass component.

[0052] In the above composition, Zn 2 TiO 4 The mole fraction x of is preferably in the range greater t...

Embodiment 1

[0072] (Example belonging to the first embodiment of the present invention)

[0073] 0.33 moles of titanium dioxide (TiO 2 ) together with 0.66 mol zinc oxide (ZnO) and ethanol were placed in a ball mill and mixed for 12 hours. The solvent was removed from the solution, and the resulting material was pulverized and calcined at 1000°C in an air atmosphere to obtain Zn 2 TiO 4 Calcined powder. Then, 0.5 mol TiO 2 and 0.5 moles of ZnO are mixed and calcined in the same manner as above to obtain ZnTiO 3 Calcined powder. The resulting Zn 2 TiO 4 and ZnTiO 3 Calcined powder with TiO 2 They were mixed at the ratios shown in Table 1 to prepare base materials (main components). Add 10 parts by weight of glass powder to 100 parts by weight of the above-mentioned substrate, the composition of the glass powder is 63.5% by weight of ZnO, 8% by weight of SiO 2 , 1.5 wt% Al 2 o 3 , 7 wt% BaO, and 20 wt% B 2 o 3 , the resulting mass was placed in a ball mill and mixed for 24 ho...

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Abstract

A dielectric ceramic composition having a relative dielectric constant [epsilon]r of 15-25 allowing formation of a multilayer ceramic component having an appropriate size, capable of being sintered at a temperature lower than 800-1000 DEG C allowing incorporation and lamination of low resistance conductors of Cu or Ag through simultaneous sintering, and having a low dielectric loss tan delta (high Q-value) and a temperature coefficient tauf of resonance frequency has an absolute value not larger than 50 ppm / DEG C. The dielectric ceramic composition, 3-30 pts.wt. of lead-free low melting point glass contains 50-75 wt.% of ZnO, 5-30 wt.% of B2O3, 6-15 wt.% of SiO2, 0.5-5 wt.% of Al2O3, and 3-10 wt.% of BaO , based on 100 pts.wt. of principal component represented by a general formula x'Zn2TiO4-(1-x'-y')ZnTiO3-y'TiO2 where 0.15 C04B 35 / 462 H01B 3 / 12 H01G 4 / 12 2 30 2 2004 / 5 / 19 1791562 2006 / 6 / 21 100378030 2008 / 4 / 2 2008 / 4 / 2 2008 / 4 / 2 Ube Industries Japan Kawano Takafumi Fukuda Koichi fan weimin yang jing 11219 Japan 2003 / 5 / 20 142148 / 2003 Japan 2003 / 5 / 20 142149 / 2003 2005 / 11 / 21 PCT / JP2004 / 006735 2004 / 5 / 19 WO2004 / 103929 2004 / 12 / 2 Japanese

Description

technical field [0001] The present invention relates to a relative permittivity of about 15-25, and a temperature coefficient τ of the resonant frequency f A dielectric ceramic with a small absolute value, which can be sintered simultaneously with Au, Ag, Cu, etc. as a low-resistance conductor, and has a small dielectric loss (high Q value) suitable for laminated ceramic parts, and involves obtaining A composition of the dielectric ceramic, a method of manufacturing the dielectric ceramic composition, and a laminated ceramic part using the dielectric ceramic composition, such as a laminated dielectric capacitor, an LC filter, and the like. [0002] In particular, the present invention relates to a dielectric ceramic composition comprising a main component containing Zn and a glass component 2 TiO 4 and ZnTiO 3 and, if necessary, TiO 2 , and relates to a manufacturing method of the dielectric ceramic composition, and a dielectric ceramic and a laminated ceramic part using t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462H01B3/12H01G4/12C04B35/46H01B3/02
Inventor 河野孝史福田晃一
Owner UBE IND LTD