Unlock instant, AI-driven research and patent intelligence for your innovation.

Low-loss high-temperature-stability NPO capacitor dielectric material and preparation method thereof

A capacitor dielectric and high temperature technology, applied in the direction of fixed capacitor dielectric, fixed capacitor components, etc., can solve the problems of high sintering temperature and difficulty in controlling the addition of negative temperature coefficient compensation materials, so as to achieve lower sintering temperature, rich raw materials, Inexpensive effect

Inactive Publication Date: 2017-12-01
WUHAN UNIV OF TECH
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(MgTiO 3 -ZnTiO 3 )-based ceramics are mainly prepared by the traditional solid-state method, and the high-temperature sintering temperature is usually 1200-1300 ° C. The common negative temperature coefficient compensation materials in domestic and foreign researches are CaTiO 3 , CaTiO 3 The dielectric constant is about 1300, and the temperature coefficient is -1500~1600ppm / ℃. By adding an appropriate amount of CaTiO 3 The temperature coefficient of capacitance can be adjusted to -60~60ppm / ℃, but there are reasons such as the sintering temperature is too high and the amount of negative temperature coefficient compensation material is difficult to control.

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
  • Low-loss high-temperature-stability NPO capacitor dielectric material and preparation method thereof
  • Low-loss high-temperature-stability NPO capacitor dielectric material and preparation method thereof
  • Low-loss high-temperature-stability NPO capacitor dielectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A medium dielectric constant, low loss, high temperature stability (MgTiO 3 -ZnTiO 3 )-Based ceramics, the composition is: [0.8mol% SrTiO 3 -(Mg 2 / 3 Zn 1 / 3 )TiO 3 ]-3wt%B 2 O 3 , The molar ratio and the weight ratio can be written as: MgTiO 3 (0.661mol%), ZnTiO 3 (0.331mol%), SrTiO 3 (0.8mol%), B 2 O 3 (3wt%), prepared by the following method:

[0028] Use analytical pure oxide 4MgCO 3 ·Mg(OH) 2 ·5H 2 O(> 98%), TiO 2 (> 99%), ZnO(> 99%), SrCO 3 (> 99%), B 2 O 3 (> 99%) is the raw material, calculated according to the stoichiometric ratio, and the ingredients are synthesized into 3wt% B 2 O 3 -[0.8mol%SrTiO 3 -(Mg 2 / 3 Zn 1 / 3 )TiO 3 ] The components are mixed in a ball mill jar. Will be prepared 3wt% B 2 O 3 -[0.8mol%SrTiO 3 -(Mg 2 / 3 Zn 1 / 3 )TiO 3 ] The powder is ball milled on a ball mill for 24 hours, dried in a drying box at 100°C, and pre-fired at 1100°C for 2h~3h, and then the pre-fired powder is ball-milled for a second time. After 24 hours, it is in the drying box. Dry...

Embodiment 2

[0031] A medium dielectric constant, low loss, high temperature stability (MgTiO 3 -ZnTiO 3 )-Based ceramics, the composition is: [0.8mol% SrTiO 3 -(Mg 2 / 3 Zn 1 / 3 )TiO 3 ]-1wt%B 2 O 3 , The molar ratio and the weight ratio can be written as: MgTiO 3 (0.661mol%), ZnTiO 3 (0.331mol%), SrTiO 3 (0.8mol%), B 2 O 3 (1wt%), prepared by the following method:

[0032] Use analytical pure oxide 4MgCO 3 ·Mg(OH) 2 ·5H 2 O(> 98%), TiO 2 (> 99%), ZnO(> 99%), SrCO 3 (> 99%), B 2 O 3 (> 99%) is the raw material, calculated according to the stoichiometric ratio, and the ingredients are synthesized into 1wt% B 2 O 3 -[0.8mol%SrTiO 3 -(Mg 2 / 3 Zn 1 / 3 )TiO 3 ] The components are mixed in a ball mill jar. Will be prepared 1wt% B 2 O 3 -[0.8mol%SrTiO 3 -(Mg 2 / 3 Zn 1 / 3 )TiO 3 ] The powder is ball milled on a ball mill for 24 hours, dried in a drying box at 100°C, and pre-fired at 1100°C for 2h~3h, and then the pre-fired powder is ball-milled for a second time. After 24 hours, it is in the drying box. Dry...

Embodiment 3

[0035] A medium dielectric constant, low loss, high temperature stability (MgTiO 3 -ZnTiO 3 )-Based ceramics, the composition is: [0.8mol% SrTiO 3 -(Mg 2 / 3 Zn 1 / 3 )TiO 3 ]-0.5wt%B 2 O 3 , The molar ratio and the weight ratio can be written as: MgTiO 3 (0.661mol%), ZnTiO 3 (0.331mol%), SrTiO 3 (0.8mol%), B 2 O 3 (0.5wt%), prepared by the following method:

[0036] Use analytical pure oxide 4MgCO 3 ·Mg(OH) 2 ·5H 2 O(> 98%), TiO 2 (> 99%), ZnO(> 99%), SrCO 3 (> 99%), B 2 O 3 (> 99%) is the raw material, calculated according to the stoichiometric ratio, so that the ingredients are synthesized to 5wt% B 2 O 3 -[0.8mol%SrTiO 3 -(Mg 2 / 3 Zn 1 / 3 )TiO 3 ] The components are mixed in a ball mill jar. Will be prepared 5wt% B 2 O 3 -[0.8mol%SrTiO 3 -(Mg 2 / 3 Zn 1 / 3 )TiO 3 ] The powder is ball milled on a ball mill for 24 hours, dried in a drying box at 100°C, and pre-fired at 1100°C for 2h~3h, and then the pre-fired powder is ball-milled for a second time. After 24 hours, it is in the drying box...

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 belongs to the field of microwave ceramics, and particularly relates to a low-loss high-temperature-stability NPO capacitor dielectric material and a preparation method thereof. The composition of the NPO capacitor dielectric material is expressed as [0.8mol%SrTiO3-(Mg2 / 3Zn1 / 3)TiO3]-bwt%B2O3, wherein 0.5<=b<=5. By using B2O3 as a fluxing agent, sintering molding is formed at 1130-1170 DEG C, thereby greatly lowering the sintering temperature, and saving energy consumption; meanwhile, the dielectric constant of the NPO capacitor dielectric material is in a range of 19-25, and the temperature coefficient of capacitance in a temperature interval range of (-55)-125 DEG C is (-60)-60ppm / DEG C; and the NPO capacitor dielectric material has the dielectric properties of medium dielectric constant, high temperature stability, low loss and the like.

Description

Technical field [0001] The invention belongs to the field of microwave ceramics, and specifically relates to a low-loss high-temperature-stability NPO capacitor dielectric material and a preparation method thereof. Background technique [0002] Internationally, multi-layer ceramic capacitor manufacturers such as ATC, FERRO, NOVACAP of the United States, Murata, Panasonic and Philips of the Netherlands are among the top companies in the world. Since the large-scale production of multilayer ceramic capacitors, they have become the mainstream of the capacitor market in recent years, and the annual market sales have increased rapidly. my country’s MLCC industry has been lagging behind the strong electronic information industry (such as Japan and the United States). Domestic MLCC manufacturers, represented by companies such as Fenghua Hi-Tech, continue to introduce foreign advanced MLCC technology to improve the domestic current situation. With technology, the gap between my country 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): C04B35/462C04B35/622H01G4/12
CPCC04B35/462C04B35/622C04B2235/3206C04B2235/3213C04B2235/3232C04B2235/3234C04B2235/3409C04B2235/96H01G4/1209H01G4/1218H01G4/1227
Inventor 刘韩星於想郝华尧中华曹明贺
Owner WUHAN UNIV OF TECH