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Low-loss and high-dielectric constant X9R ceramic capacitor dielectric material and preparation method thereof

A high dielectric constant, ceramic capacitor technology, applied in the direction of fixed capacitor dielectrics, fixed capacitor components, etc., can solve the problems of affecting the temperature stability of ceramic capacitors, complex composition of barium titanate ceramics, unsuitable for industrial production, etc. Achieving the effects of good temperature stability, good temperature stability and simple composition

Inactive Publication Date: 2018-06-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the dielectric material of MLCC is mainly barium titanate ceramics. Barium titanate ceramics is a ferroelectric material with a dielectric constant of 2000-4000 at room temperature. However, when the temperature exceeds the Curie point of barium titanate ~ 125 ° C When the dielectric constant drops significantly, it seriously affects the temperature stability of ceramic capacitors
For this reason, researchers doped and modified barium titanate in order to obtain X9R ceramic capacitor dielectric materials with stable capacitance. For example, the patent literature with application number 201410704138.X carried out doping and modification on barium titanate ceramics. However, The components of barium titanate ceramics modified by doping are very complex; another example is the patent document No. 201610037683.7, which also modified barium titanate ceramics, but the modified barium titanate ceramics contained a large amount of bismuth, Bismuth is easy to volatilize at high temperature and is not suitable for industrial production

Method used

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  • Low-loss and high-dielectric constant X9R ceramic capacitor dielectric material and preparation method thereof
  • Low-loss and high-dielectric constant X9R ceramic capacitor dielectric material and preparation method thereof
  • Low-loss and high-dielectric constant X9R ceramic capacitor dielectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] (1) According to the chemical formula (Nd 0.5 Nb 0.5 ) 0.005 Ti 0.995 o 2 , with Nd 2 o 3 , Nb 2 o 5 and TiO 2 As a raw material, it is accurately weighed according to the standard stoichiometric ratio, and then wet ball milled with a planetary ball mill for 3 hours with water as the medium, dried at 80°C for 15 hours after ball milling, and passed through an 80-mesh sieve to obtain a uniformly mixed powder. Among them, a planetary ball mill was used with a rotation speed of 250 r / min.

[0032] (2) The obtained powder was calcined in the air at 1150°C for 2h, then wet ball milled for 4h, and then dried at 80°C for 15h to obtain (Nd 0.5 Nb 0.5 )0.002 Ti 0.998 o 2 Powder. Among them, the mass ratio of zirconia balls, deionized water and powder used in wet ball milling is 1:1:1.1, the diameter of zirconia balls is 3mm:5mm:8mm=4:2:1, the speed of ball milling It is 250r / min.

[0033] (3) Press the uniformly mixed powder into discs with a diameter of 10 mm and...

example 2

[0036] (1) According to the chemical formula (Nd 0.5 Nb 0.5 ) 0.01 Ti 0.99 o 2 , with Nd 2 o 3 , Nb 2 o 5 and TiO 2 As a raw material, it is accurately weighed according to the standard stoichiometric ratio, and then wet ball milled with a planetary ball mill for 4 hours using water as the medium, dried at 75°C for 20 hours after ball milling, and passed through a 120-mesh sieve to obtain a uniformly mixed powder. Among them, a planetary ball mill was used with a rotation speed of 300 r / min.

[0037] (2) The obtained powder was calcined in air at 1200°C for 2.5h, then wet ball milled for 3h, and then dried at 75°C for 20h to obtain (Nd 0.5 Nb 0.5 ) 0.01 Ti 0.99 o 2 Powder. Among them, the mass ratio of zirconia balls, deionized water and powder used in wet ball milling is 0.5:1:1.5, the diameter of zirconia balls is 3mm:5mm:8mm=4:2:1, the speed of ball milling 300r / min.

[0038] (3) Press the evenly mixed powder into a disc with a diameter of 10mm and a thickne...

example 3

[0041] (1) According to the chemical formula (Nd 0.5 Nb 0.5 ) 0.03 Ti 0.97 o 2 , with Nd 2 o 3 , Nb 2 o 5 and TiO 2 As a raw material, it is accurately weighed according to the standard stoichiometric ratio, and then wet ball milled with a planetary ball mill for 5 hours using water as the medium, dried at 90°C for 24 hours after ball milling, and passed through a 40-mesh sieve to obtain a uniformly mixed powder. Among them, a planetary ball mill was used with a rotation speed of 270 r / min.

[0042] (2) The obtained powder was calcined in the air at 1175°C for 3h, then wet ball milled for 5h once, and then dried at 90°C for 24h to obtain (Nd 0.5 Nb 0.5 ) 0.03 Ti 0.97 o 2 Powder. Among them, the mass ratio of zirconia balls, deionized water and powder used in wet ball milling is 1:2.2:1.8, the diameter of zirconia balls is 3mm:5mm:8mm=4:2:1, the speed of ball milling It is 270r / min.

[0043] (3) Press the evenly mixed powder into a disc with a diameter of 10mm a...

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Abstract

The invention provides a low-loss and high-dielectric constant X9R ceramic capacitor dielectric material and a preparation method thereof. The chemical formula of the material is (Nd0.5Nb0.5)xTi1-xO2,and the value of x ranges from 0.005 to 0.11. The preparation method comprises the following steps: taking and proportioning Nd2O3, Nb2O5 and TiO2 according to the standard stoichiometry of (Nd0.5Nb0.5)xTi1-xO2, mixing and ball-milling the taken materials, and sequentially performing drying, sieving, pre-sintering, secondary wet ball-milling, cold isostatic pressing molding and sintering ceramicformation to produce the low-loss and high-dielectric constant X9R ceramic capacitor dielectric material. The high dielectric constant (being more than 10<4>), the low dielectric loss (being less than2.5%), the good frequency (20 to 10<4> Hz), the good temperature stability (-55 to 200 DEG C) and the temperature change rate (being less than + / - 15%) of the material meet EIAX9R standards. The preparation method is simple, has no pollution to the environment, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of electronic ceramics, is applied to electronic components, and relates to a low-loss high dielectric constant X9R ceramic capacitor dielectric material and a preparation method thereof. Background technique [0002] In the 21st century, with the rapid development of science and technology, electronic components are developing towards miniaturization, chip and integration. Ceramic capacitors are commonly used electronic and electrical components in the electronics and electric power industries, especially multilayer ceramic capacitors (MLCCs) are widely used in military, aerospace, automotive, underground exploration and other fields. [0003] According to the International Electronic Industries Association (EIA, Electronic Industries Association) standard, the X9R type MLCC refers to the capacitance change rate ΔC / C in the temperature range from -55°C to 200°C based on the capacitance value at 25°C 25 <±15%, die...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622H01G4/12
CPCC04B35/462C04B35/622C04B2235/3224C04B2235/3251H01G4/1218
Inventor 王卓陈浩楠王添肖雨佳念雯雯范家豪
Owner SHAANXI UNIV OF SCI & TECH
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