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Dielectric material for thermostable laminated ceramic capacitor with basic-metal inner electrode

一种温度稳定型、多层陶瓷的技术，应用在固定电容器电介质、固定电容器、电容器等方向，能够解决不适合大规模生产、介电温度系数大、烧结温度高等问题，达到变化率小、介电损耗小、材料均匀性好的效果

Inactive Publication Date: 2003-03-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This composition basically meets the performance requirements of X7R. The dielectric constant at room temperature is above 2500, but the sintering temperature is too high, greater than 1350°C; the dielectric temperature coefficient is relatively large, close to -15% at -55°C; the loss is relatively large, basically higher than 2.0%
Therefore not suitable for mass production

Method used

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  • Dielectric material for thermostable laminated ceramic capacitor with basic-metal inner electrode
  • Dielectric material for thermostable laminated ceramic capacitor with basic-metal inner electrode
  • Dielectric material for thermostable laminated ceramic capacitor with basic-metal inner electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1, first according to BaTiO 3 : 96mol%; (grain size is 400nm) CaTiO 3 0.5mol%; CaO: 0.3mol%; SiO 2 0.8mol%; SrO: 0.3mol%; MnO 2 : 0.2mol%; MgO: 0.2mol%; Co 2 o 3 : 0.2mol%; Y 2 o 3 : 0.5mol%; Sm 2 o 3 : 1.0mol% proportioning and weighing. Then add glass frit (Ba A Ca (1-A) O) x ·(Si B Ti (1-B) o 2 ) (A=0.4, B=0.9, x=1.1), accounting for 2wt% of the above mixture. The above materials were mixed, ball milled and then dried. The ceramic material is cast into a diaphragm, superimposed with a Ni electrode to make a MLCC green body, and after debinding, it is sintered in a reducing atmosphere (N is introduced during the sintering process). 2 / H 2 , while humidifying, the oxygen partial pressure is controlled at 10 -10 atm, at a rate of 200°C / hour to 1250°C, the holding time is 2 hours), and then annealed under weak oxidation conditions (furnace temperature is 1100°C, holding time is 4 hours, and the oxygen partial pressure is controlled at 10 -...

Embodiment 2

[0042] Embodiment 2, first according to BaTiO 3 : 95.2mol%; (grain size is 200nm) CaTiO 3 : 0.7mol%; CaO: 0.4mol%; SiO 2 : 0.8mol%; SrO: 0.3mol%; MnO 2 : 0.3mol%; MgO: 0.3mol%; Co 2 o 3 : 0.2mol%; Y 2 o 3 : 0.8mol%; Lu 2 o 3 : 1.0mol% proportioning and weighing. Then add glass frit (Ba A Ca (1-A) O) x ·(Si B Ti (1-B) o 2 ) (A=0.5, B=0.8, x=1), accounting for 1.5wt% of the above mixture. The above materials were mixed, ball milled and then dried. The ceramic material is cast into a diaphragm, superimposed with a Ni electrode to make a MLCC green body, and after debinding, it is sintered in a reducing atmosphere (N is introduced during the sintering process). 2 / H 2 , while humidifying, the oxygen partial pressure is controlled at 10 -9 atm, the temperature was raised to 1200°C at a rate of 200°C / hour, and the holding time was 2 hours), and then annealed under weak oxidation conditions (furnace temperature was 1100°C, holding time was 4 hours, and the oxygen pa...

Embodiment 3

[0044] Embodiment 3, first according to BaTiO 3 : 95mol%; (grain size is 500nm) CaTiO 3 : 0.7mol%; CaO: 0.4mol%; SiO 2 : 0.7mol%; SrO: 0.3mol%; MnO 2 : 0.5mol%; MgO: 0.4mol%; Co 2 o 3 : 0.2mol%; Y 2 o 3 : 0.7mol%; Gd 2 o 3 : 1.1mol% proportioning and weighing. Then add glass frit (Ba A Ca (1-A) O) x ·(Si B Ti (1-B) o 2 ) (A=0.5, B=0.9, x=1.1), accounting for 2.5wt% of the above mixture. The above materials were mixed, ball milled and then dried. The ceramic material is cast into a diaphragm, superimposed with a Ni electrode to make a MLCC green body, and after debinding, it is sintered in a reducing atmosphere (N is introduced during the sintering process). 2 / H 2 , while humidifying, the oxygen partial pressure is controlled at 10 -9 atm, the temperature was raised to 1280°C at a rate of 200°C / hour, and the holding time was 2 hours), and then annealed under weak oxidation conditions (furnace temperature was 1100°C, holding time was 4 hours, and the oxygen pa...

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Abstract

The present invention is material for laminated ceramic capacitor with high temperature stability and basic material inner electrodes. The inner electrode is made of low cost metal, such as Ni, Cu and their alloy. The dielectric material comprises BaTiO3 as main component, and additives in cludes CaO, CaTiO3, BaO, SiO2, SrO2, MnO2, MgO, Co2O3, Co3O4, Fe2O3 and Y2O3 as well as one or more RE oxide and salt in certain proportion and is prepared through mixing, sintering in reducing atmosphere of mixed nitrogen and hydrogen. The dielectric has excellent performance, including room temperature dielectric constant of 2000-3000, etc. The material of the present invention is suitable for producing great capacity superthin laminated ceramic capacity with high insulating resistivity and stable performance.

Description

technical field [0001] The invention belongs to the technical field of capacitor materials, in particular to a temperature-stable base metal inner electrode multilayer ceramic capacitor dielectric material. Background technique [0002] With the rapid development of various types of electronic equipment such as digital cameras, mobile phones, notebook computers, handheld computers and other mobile electronic equipment, miniaturization and light weight are inevitable trends, and the components that make up these electronic equipment must also be reduced in size And weight, in order to adapt to the needs of the installation technology of electronic components to surface mount technology (SMD), the components required by surface mount technology are chip components. Multilayer ceramic capacitors are the most widely used type of chip components. Multilayer Ceramic Capacitors (Multilayer CeramicCapacitors) referred to as MLCC. It stacks the electrode material and the ceramic gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B18/00C04B35/468H01B3/12H01G4/12
CPCC04B2235/3418C04B2235/5445C04B2235/3267C04B2235/3206B32B2311/22C04B2235/36C04B35/4682C04B2237/704H01G4/1227C04B2235/663C04B2235/3208C04B2235/6025C04B2235/3213C04B2237/405C04B2235/6584C04B35/64C04B2237/346C04B2235/3224C04B2235/3272C04B2235/3225B32B18/00C04B2235/3275C04B2235/3236
Inventor 王晓慧陈仁政桂治轮李龙土
Owner TSINGHUA UNIV
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