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A kind of high dielectric ceramic capacitor material with high temperature stability and preparation method thereof

A ceramic capacitor and stability technology, applied in the field of electronic ceramics, can solve problems such as poor temperature stability, achieve the effect of improving temperature stability, green raw materials, and suitable for large-scale promotion

Active Publication Date: 2021-07-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above, the present invention aims at the problem of poor temperature stability of strontium titanate high-dielectric ceramic capacitors at present, and provides a high-dielectric ceramic capacitor material with high temperature stability, high dielectric constant and low loss and its preparation method

Method used

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  • A kind of high dielectric ceramic capacitor material with high temperature stability and preparation method thereof
  • A kind of high dielectric ceramic capacitor material with high temperature stability and preparation method thereof
  • A kind of high dielectric ceramic capacitor material with high temperature stability and preparation method thereof

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Embodiment 1

[0054] As a comparative example, this embodiment provides a method for preparing a high-dielectric ceramic capacitor material, and the specific operations are as follows:

[0055] Step 1: SrCO 3 ,TiO 2 The powder was prepared according to the molar ratio of 1:1, deionized water was used as the solvent, zirconia balls were used as the ball milling medium, and SrCO 3 and TiO 2 Powder ball milling, the ratio of material: ball: water is 1:4:1.5, and the ball milling time is 24 hours;

[0056] Step 2: Place the ball-milled mixture in an oven to dry at 120°C, pass through a 40-mesh sieve, and pre-fire the sieved material in air at a sintering temperature of 1250°C and a holding time of 2 hours to obtain the base material;

[0057] Step 3: Add 0.05g Nb to 100g base material 2 o 5 , 0.10gTa 2 o 5 , mix the prepared doping material with the base material, the ratio of material: ball: water is 1:4:1.5, ball mill for 6 hours, place in an oven to dry at 120°C, and pass through a 4...

Embodiment 2

[0062] This embodiment provides a method for preparing a high-dielectric ceramic capacitor material, and the specific operations are as follows:

[0063] Step 1: SrCO 3 ,TiO 2 The powder was prepared according to the molar ratio of 1:1, deionized water was used as the solvent, zirconia balls were used as the ball milling medium, and SrCO 3 and TiO 2 Powder ball milling, the ratio of material: ball: water is 1:4:1.5, and the ball milling time is 24 hours;

[0064] Step 2: Place the ball-milled mixture in an oven to dry at 120°C, pass through a 40-mesh sieve, and pre-fire the sieved material in air at a sintering temperature of 1250°C and a holding time of 2 hours to obtain the base material;

[0065] Step 3: Add CaCO 3 , SiO 2 , Al 2 o 3 and H 3 BO 3The four components are ball milled, dried, and sieved to obtain a mixture, and then the mixture is used to pre-synthesize glass at 1450 ° C. The specific operation is as follows: 0% to 30% CaCO 3 , 20% to 50% Al 2 o 3 ...

Embodiment 3

[0071] This embodiment provides a method for preparing a high-dielectric ceramic capacitor material, the operation of which is basically the same as that of Embodiment 2, except for the composition of the CABS glass powder, which is shown in Table 1 below in this embodiment.

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Abstract

A high-dielectric ceramic capacitor material with high temperature stability and a preparation method thereof belong to the technical field of electronic ceramics. The ceramic material includes a base material and a dopant, and the crystal phase of the base material is SrTiO 3 , the dopant comprises 0.03% to 0.35% Nb in the mass fraction of the base material 2 o 5 , 0.02% ~ 0.40% Ta 2 o 5 , 0.10% ~ 0.50% Li 2 CO 3 , 0.05% ~ 0.35% CaCO 3 , 0.03% ~ 0.40% SiO 2 , 0.02% ~ 0.40% Al 2 o 3 and 0.05%~0.35% MnCO 3 ; The dopant and the base material are mixed, shaped, sintered in a reducing atmosphere, and finally oxidized and heat-treated. The ceramic material prepared by the present invention has good temperature stability at -55°C-150°C, and the capacitance temperature change rate ΔC·C-1 (-55°C-150°C) is within ±10%, which meets the X8P standard; and The dielectric constant of the material is 16000-19000, the loss value is below 2.5%, and the insulation resistivity is 10 11 Ω·cm, very suitable for the production of high-quality single-layer ceramic capacitors.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramics, and in particular relates to a high-dielectric ceramic capacitor material with high temperature stability and a preparation method thereof. Background technique [0002] High-dielectric high-dielectric ceramic capacitor is a common passive device, which can play the role of DC blocking, coupling, bypass, filtering, tuning circuit, energy conversion, control circuit, etc. in the circuit, and is widely used in production and life. With the development of miniaturization and light weight of electronic equipment, the requirements for the miniaturization of electronic components are getting higher and higher, which makes the demand for high-dielectric ceramic capacitors increase significantly. The high-dielectric ceramic capacitors currently used are usually based on BaTiO 3 , SrTiO 3 Materials with a perovskite structure are used as the main crystal phase. While pursuing high dielectric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/062C04B35/47C04B35/622C04B35/626C03C3/064C03C3/087C03C3/091
CPCC03C3/062C03C3/064C03C3/087C03C3/091C04B35/47C04B35/622C04B35/62605C04B2235/3203C04B2235/3208C04B2235/3217C04B2235/3251C04B2235/3262C04B2235/3418C04B2235/6562C04B2235/6567
Inventor 钟朝位李欣源唐斌
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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