Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of piezo-capacitance bifunctional titania ceramic with high dielectric constant and preparation method thereof

A high dielectric constant, titanium dioxide technology, applied in the direction of varistor, varistor core, etc., can solve the problems of high potential gradient, nonlinear coefficient and low dielectric constant value, etc., to achieve strong repeatability, preparation The effect of simple process and excellent comprehensive performance

Active Publication Date: 2021-03-26
SICHUAN UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN105418066 A discloses a method for preparing varistor-capacitance dual-function varistor ceramics. The varistor voltage is between 2.3-13.1V / mm, the nonlinear coefficient is between 2-4.3, and the highest dielectric constant is 9.5×10 4 , the nonlinear coefficient and the dielectric constant value are low, which will limit its application
The giant dielectric nonlinear varistor ceramics announced by the patent CN 1830893 A adopts CaCO 3 , CuO, TiO 2 It is made by sintering raw materials in air at one time. The process is simple and the cost is low. The product with the highest dielectric constant of 21150 and the nonlinear coefficient of 5-8 can be obtained, but its potential gradient is relatively high, at 43-400V / Between mm, the pressure-sensitive performance needs to be further improved

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
  • A kind of piezo-capacitance bifunctional titania ceramic with high dielectric constant and preparation method thereof
  • A kind of piezo-capacitance bifunctional titania ceramic with high dielectric constant and preparation method thereof
  • A kind of piezo-capacitance bifunctional titania ceramic with high dielectric constant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Micron-sized powder according to 99.35mol%TiO 2 , 0.3mol%SiO 2 , 0.2mol%Nb 2 o 5 , 0.15mol%Ho 2 o 3 Weigh the mixture and place it in an agate jar, add an appropriate amount of ethanol, and mill it on a planetary ball mill for 10 hours at a speed of 300r / min to make the powder evenly mixed. Filter the ball-milled slurry and put it in a drying oven at 60°C for 24 hours. Add 5wt% polyvinyl alcohol to granulate, sieve, and press with 100MPa pressure to form discs. Insulate at 400°C for 60 minutes, raise the temperature to 1350°C at a heating rate of 5°C / min, hold for 3 hours, and cool to room temperature with the furnace. Moderately polish the upper and lower ends of the ceramic sheet, spray silver paste, and keep warm at 600°C for 60 minutes. Its X-ray diffraction analysis showed that only TiO was present in the sample 2 Mutually. Measured at room temperature: the varistor voltage is 7.8V / mm, and the dielectric constant is 7.4×10 4 (under 1KHz), the nonlinear co...

Embodiment 2

[0029] Micron-sized powder according to 99.35mol%TiO 2 , 0.3mol%SiO 2 , 0.2mol%Nb 2 o 5 , 0.15mol%Ho 2 o 3 Weigh the mixture and place it in an agate jar, add an appropriate amount of ethanol, and mill it on a planetary ball mill for 6 hours at a speed of 400r / min to make the powder evenly mixed. Filter the ball-milled slurry and put it in a drying oven at 70°C for 12 hours. Add 7wt% polyvinyl alcohol to granulate, sieve, and press with 110MPa pressure to form discs. Insulate at 400°C for 75 minutes, raise the temperature to 1400°C at a heating rate of 7°C / min, hold for 2.5 hours, and cool to room temperature with the furnace. Moderately polish the upper and lower ends of the ceramic sheet, spray silver paste, and keep warm at 620°C for 50 minutes. Measured at room temperature: the varistor voltage is 5.7V / mm, and the dielectric constant is 1.06×10 5 , the nonlinear coefficient is 4.7.

Embodiment 3

[0031] Micron-sized powder according to 99.05mol%TiO 2 , 0.3mol%SiO 2 , 0.2mol%Nb 2 o 5 , 0.45mol%Ho 2 o 3 Weigh the mixture and place it in an agate jar, add an appropriate amount of ethanol, and mill it on a planetary ball mill for 10 hours at a speed of 300r / min to make the powder evenly mixed. Filter the ball-milled slurry and put it into a drying oven at 70°C to dry for 14 hours. Add 6wt% polyvinyl alcohol to granulate, sieve, and press with 120MPa pressure to form discs. Insulate at 400°C for 70 minutes, raise the temperature to 1400°C at a heating rate of 6°C / min, hold for 2 hours, and cool to room temperature with the furnace. Moderately polish the upper and lower ends of the ceramic sheet, spray silver paste, and keep warm at 650°C for 45 minutes. Measured at room temperature: the varistor voltage is 6V / mm, and the dielectric constant is 1.88×10 5 , the nonlinear coefficient is 5.5.

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

PropertyMeasurementUnit
relative permittivityaaaaaaaaaa
Login to View More

Abstract

The invention provides a varistor-capacitor bifunctional titanium dioxide ceramic with a high dielectric constant and a preparation method thereof, belonging to the technical field of functional ceramics. The preparation method is characterized by comprising the following steps: with micrometer titanium dioxide as a main body, adding micrometer additives consisting of silicon dioxide, niobium pentoxide and holmium oxide; carrying out ball milling, filtration, drying, granulation, sieving and pressing to prepare small wafers; performing heat preservation and binder discharging at 400 DEG C for1-1.5 h; then carrying out heating to 1350-1450 DEG C and performing sintering; then carrying out cooling in a furnace to room temperature; performing polishing and spraying of silver paste; and maintaining the temperature at 600-700 DEG C for a period of time so as to obtain the varistor-capacitor bifunctional titanium dioxide ceramic. Niobium pentoxide allows the titanium dioxide ceramic to havesemiconductor properties; the silicon dioxide promotes the uniformity of ceramic grains; and the holmium oxide can improve electrical properties. The titanium dioxide ceramic of the invention has good comprehensive electrical properties and both varistor and capacitor functions, and has a varistor electric potential gradient of 3.3-8.6 V / mm, a relative dielectric constant of 7.4*10<4>-1.88*10<5>(1KHz) and a nonlinear coefficient of 4.2 and 5.5; and the preparation method has the advantages of simple preparation process, good stability, etc.

Description

technical field [0001] The invention relates to a pressure-sensitive-capacitance dual-function titanium dioxide ceramic with high dielectric constant and a preparation method thereof, belonging to the technical field of functional ceramics. Background technique [0002] In the 1930s, in order to replace the selenium rectifier in the protection circuit, Bell Labs first developed a SiC-based varistor. Since then, after decades of development, ZnO, SrTiO have been developed 3 , BaTiO 3 , SnO 2 、TiO 2 And other series of pressure-sensitive ceramics, while the more mature ones at home and abroad are ZnO series and SrTiO 3 Tie. [0003] ZnO-based varistor ceramics have high nonlinear coefficient and varistor voltage gradient, strong ability to absorb surges, and stable performance, and are widely used in devices such as surge absorption, overvoltage protection, and voltage stability. With the development of miniaturization and low voltage of electronic devices, research on l...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/46C04B35/622C04B41/88H01C7/115
CPCC04B35/46C04B35/622C04B41/5116C04B41/88C04B2235/3224C04B2235/3251C04B2235/3418H01C7/115
Inventor 朱达川彭凤超
Owner SICHUAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com