Dielectric material for X7R type ceramic capacitor and preparation method of dielectric material

A technology for ceramic capacitors and dielectric materials, applied in the field of X7R type ceramic capacitor dielectric materials and their preparation, can solve the problems of lead, human body and environmental hazards, and achieve the effects of low cost, good temperature stability and good industrialization prospects.

Active Publication Date: 2019-11-08
GUILIN UNIVERSITY OF TECHNOLOGY
View PDF19 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the lead-based ferroelectric X7R ceramic system is widely used, but because the system contains lead, it will cause great harm to the human body and the environment during production and application.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dielectric material for X7R type ceramic capacitor and preparation method of dielectric material
  • Dielectric material for X7R type ceramic capacitor and preparation method of dielectric material
  • Dielectric material for X7R type ceramic capacitor and preparation method of dielectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] BaCO with a purity of 99.99% 3 , SrCO 3 、Sm 2 o 3 , Fe 2 o 3 and Nb 2 o 5 The raw material is Ba according to the stoichiometric ratio 2 Sr 2 SmFe 0.5 Nb 9.5 o 30 Put the ingredients into the ball mill tank; select zirconia balls and nylon tanks; the quality of the added raw materials is 8% of the mass of the balls; the mixing ball milling time is 24 hours, the speed is 350 rpm, and the ball milling medium is absolute ethanol; the obtained product Dry in an oven at 100°C for 4 hours, then pre-sinter at 1000°C for 4 hours at a heating rate of 5°C / min; take out the pre-fired powder and grind it, and then use absolute ethanol as the ball milling medium for 24 hours. Mix evenly, dry at 100°C for 4 hours, grind into powder, use 8% polyvinyl alcohol aqueous solution as a binder to granulate, pass through a 60-mesh sieve, and press under a pressure of 100MPa to form a particle with a diameter of 10mm, 1mm thickness disc-shaped green body, heat up to 400°C at a heat...

Embodiment 2

[0017] BaCO with a purity of 99.99% 3 , SrCO 3 、Sm 2 o 3 , Fe 2 o 3 and Nb 2 o 5 The raw material is Ba according to the stoichiometric ratio 2 Sr 2 SmFe 0.5 Nb 9.5 o 30 Put the ingredients into the ball mill tank; select zirconia balls and nylon tanks; the quality of the added raw materials is 8% of the mass of the balls; the mixing ball milling time is 24 hours, the speed is 350 rpm, and the ball milling medium is absolute ethanol; the obtained product Dry in an oven at 100°C for 4 hours, and pre-sinter at 1100°C at a rate of 5°C / min for 4 hours; take out the pre-fired powder and grind it, and then use absolute ethanol as the ball milling medium for 24 hours. Mix evenly, dry at 100°C for 4 hours, grind into powder, use 8% polyvinyl alcohol aqueous solution as a binder to granulate, pass through a 60-mesh sieve, and press under a pressure of 100MPa to form a particle with a diameter of 10mm, thickness of 1mm disc-shaped green body, the temperature rises to 550°C a...

Embodiment 3

[0019] BaCO with a purity of 99.99% 3 , SrCO 3 、Sm 2 o 3 , Fe 2 o 3 and Nb 2 o 5 The raw material is Ba according to the stoichiometric ratio 2 Sr 2 SmFe 0.5 Nb 9.5 o 30 Put the ingredients into the ball mill tank; select zirconia balls and nylon tanks; the quality of the added raw materials is 8% of the mass of the balls; the mixing ball milling time is 24 hours, the speed is 350 rpm, and the ball milling medium is absolute ethanol; the obtained product Dry in an oven at 100°C for 4 hours, then pre-sinter at 1150°C with a heating rate of 5°C / min for 4 hours; take out the pre-fired powder and grind it, and then use absolute ethanol as the ball milling medium for 24 hours. Mix evenly, dry at 100°C for 4 hours, grind into powder, use 8% polyvinyl alcohol aqueous solution as a binder to granulate, pass through a 60-mesh sieve, and press under a pressure of 100MPa to form a particle with a diameter of 10mm, thickness of 1mm disc-shaped green body, the temperature rises...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a dielectric material for an X7R type ceramic capacitor and a preparation method of the dielectric material. The method comprises the following steps: firstly performing ball grinding on barium carbonate, strontium carbonate, samarium oxide, ferric oxide and niobium pentoxide, performing refining on the raw materials, preparing the materials according to a nominal chemicalformula and a stoichiometric ratio, performing pre-sintering, performing secondary ball milling, and preparing the dielectric material Ba2Sr2SmFe0.5Nb9.5O30 for the X7R type ceramic capacitor by utilizing a solid phase reaction process. The method provided by the invention can obtain the dielectric ceramic material with excellent temperature stability, and the material meets an electronic industries association (EIA) X7R standard; and the method provided by the invention is simple, energy-saving and emission-reducing, has moderate costs, and is suitable for mass production.

Description

technical field [0001] The invention relates to an X7R type ceramic capacitor dielectric material and a preparation method thereof, belonging to the technical field of electronic materials and devices. Background technique [0002] Capacitors are an important class of passive electronic devices. They are indispensable devices in the electronics, communication and information industries. They can store charges, block DC, filter AC, provide tuning and oscillation, etc. In recent years, with the continuous development of the electronics industry, the requirements for ceramic capacitors in the market are getting higher and higher, both for miniaturization and high reliability. According to the EIA (Electronic Industries Association) standard, the X7R type MLCC is based on the capacitance value at 25°C, and the capacitance change rate (ΔC / C25)≤ within the temperature range from -55°C to +125°C ±15%. X7R type MLCC has been widely used in various electronic terminal equipment. A...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C04B35/495C04B35/622C04B35/626C04B35/634C04B35/638
CPCC04B35/495C04B35/622C04B35/62605C04B35/63416C04B35/638C04B2235/3213C04B2235/3215C04B2235/3224C04B2235/3272C04B2235/6562C04B2235/6567
Inventor 胡长征吴山郭哲孙朝中方亮
Owner GUILIN UNIVERSITY OF TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap