High performance multilayer ceramic capacitor medium and preparation method thereof

A technology of capacitor dielectric and multilayer ceramics, which is applied in the direction of fixed capacitor dielectric, laminated capacitor, fixed capacitor components, etc., to achieve high dielectric constant, low sintering temperature, and simple preparation process

Inactive Publication Date: 2012-02-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the capacitor dielectric used in most chip multilayer ceramic capacitors and filters adopts X7R and X8R ceramic formulas, but for harsher environments, the application of these two materials has certain limitations

Method used

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  • High performance multilayer ceramic capacitor medium and preparation method thereof
  • High performance multilayer ceramic capacitor medium and preparation method thereof
  • High performance multilayer ceramic capacitor medium and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to the ingredient formula: {[(1-x)BaTiO 3 +xNBT]+ywt%Nb 2 o 5}+z wt%MgO+a wt%Glass+b wt%RE 2 o 3 +c wt%MnCO 3 ; Wherein the composition of Glass is: 8% SnO 2 +2%PbO+15%TiO2 +40% Bi 2 o 3 +35%B 2 o 3 ; First synthesize bismuth sodium titanate phase, according to Bi 2 o 3 :Na 2 CO 3 :TiO 2 = 1: 2: 6 molar ratio for batching ball milling, pre-synthesis of bismuth sodium titanate phase at 920 ° C after drying; then according to [(1-x) BaTiO 3 -+x NBT]+y wt%Nb 2 o 5 Take x=0.15, y=2.4, weigh, ball mill, and pre-burn at 1300°C for 2 hours; take z=1.2, a=4, b=0, c=0 in the total ingredient formula; put the above materials through Mix evenly by ball milling, then dry, and after sieving, add a binder, the binder is paraffin wax, the amount added is 8wt% of the total mass of the ingredients, and granulated into uniform granules; pressed under a pressure of 180Mpa to make a diameter of 16mm , a wafer with a thickness of 1mm, and then sintered, that is, t...

Embodiment 2

[0036] According to the formula {[(1-x)BaTiO 3 +xNBT]+ywt%Nb 2 o 5}+z wt%MgO+a wt%Glass+b mol%RE 2 o 3 +c MnCO 3 ; Wherein the composition of Glass is: 12% SnO 2 +18%PbO+9%TiO 2 +34% Bi 2 o 3 +27%B 2 o 3 ; First synthesize bismuth sodium titanate phase, according to Bi 2 o 3 :Na 2 CO 3 :TiO 2 = 1: 1: 2 molar ratio for batching ball milling, pre-synthesis of bismuth sodium titanate phase at 700 ° C after drying; then according to [(1-x) BaTiO 3 +xNBT]+ywt%Nb 2 o 5 Take x=0.15, y=2.6, weigh, ball mill, and pre-burn at 1190°C for 3 hours; take RE=La, z=1.7, a=1, b=0.001, c=0 in the total ingredient formula; Mix the above materials uniformly by ball milling, then dry, and after sieving, add a binder, the binder is paraffin wax, the addition amount is 8wt% of the total mass of the ingredients, granulated into uniform particles, and pressed under a pressure of 180Mpa. Form a disc with a diameter of 16mm and a thickness of 1mm, and then sinter, that is, increase the...

Embodiment 3

[0039] According to the formula {[(1-x)BaTiO 3 +xNBT]+ywt%Nb 2 o 5}+z wt%MgO+a wt%Glass+b mol%RE 2 o 3 +c MnCO 3 ; Wherein the composition of Glass is: 15% SnO 2 +3%PbO+25%TiO 2 +42% Bi 2 o 3 +15%B 2 o 3 ; First synthesize bismuth sodium titanate phase, according to Bi 2 o 3 :Na 2 CO 3 :TiO 2 = 1: 2: 5 molar ratio for batching ball milling, pre-synthesis of bismuth sodium titanate phase at 870 ° C after drying; then according to [(1-x) BaTiO 3 +xNBT]+ywt%Nb 2 o 5 Take x=0.20, y=2.2, weigh, ball mill, and pre-burn at 1500°C for 5 hours; take RE=Nd, z=1.0, a=2, b=0.008, c=0.2 in the total ingredient formula; Mix the above materials uniformly by ball milling, then dry, and after sieving, add a binder, the binder is paraffin wax, the addition amount is 8wt% of the total mass of the ingredients, granulated into uniform particles, and pressed under a pressure of 180Mpa. Form a disc with a diameter of 16mm and a thickness of 1mm, and then sinter, that is, increase t...

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Abstract

The invention discloses a multilayer ceramic capacitor medium with a formula of {[(1-x)BaTiO3+xNBT]+y wt% Nb2O5}+z wt% MgO+a wt% Glass+b wt% RE2O3+c wt% MnCO3; wherein x=0.1-0.25, and x is the mole percentage content of [(1-x)BaTiO3+xNBT]; y=2.2-2.8, and y is the mass percentage content of additional Nb2O5 on a basis of [(1-x)BaTiO3+x NBT]; z=1.0-2.0, a=1-7, b=0-0.015, c=0-0.5; and z, a, b, c aremass percentage contents of additional raw materials on a basis of {[(1-x)BaTiO3+xNBT]+y wt% Nb2O5}; NBT=natrium bismuth titanate; RE=La, Nd, or Gd; and Glass is a self-made additive, wherein the formula of Glass is 1-15% SnO2+0-22% PbO+2-26% TiO2+0-42% Bi2O3+5-39% B2O3. The preparation method comprises steps that: (1) the additive and NBT are prepared; (2) a clinker is fired according to the formula of [(1-x)BaTiO3-xNBT]-y wt% Nb2O5; (3) blending, ball-milling, drying, and grinding are carried out according to the formula; (4) the material is granulated, pressed, and shaped; (5) the product is sintered under a temperature of 1100 DEG C-1200 DEG C; and (6) silver electrode are fired, and the product is tested. The invention provides a multilayer ceramic capacitor medium material with an excellent temperature stable form (X9R form). The material is adaptable under a working temperature above 200 DEG C.

Description

technical field [0001] The invention relates to ceramic capacitors, in particular to a dielectric material for high-temperature, high-stability multilayer ceramic capacitors and a preparation method thereof. Background technique [0002] Multilayer Ceramic Capacitors (MLCC) are widely used in DC blocking, coupling, bypass, frequency discrimination and other aspects. It alternately stacks ceramic dielectric and metal electrodes, and co-fires them as a whole. MLCC is favored for its small size, high insulation, low parasitic inductance, and good high-frequency characteristics. It is especially suitable for chip surface mount technology, which can greatly increase the circuit assembly density and reduce the overall volume. Outstanding features make MLCC the world's largest and fastest-growing chip component. Although the cost of a single capacitor is very low, the use of hundreds of millions of capacitors makes it have considerable economic value. [0003] MLCC is an importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622H01G4/12H01G4/30
Inventor 李玲霞彭银贾桂荣
Owner TIANJIN UNIV
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