Wide temperature range type high-temperature lead-free ceramic capacitor material and preparation method

A technology of ceramic capacitors and lead-free ceramics, applied in capacitors, fixed capacitors, fixed capacitor dielectrics, etc., can solve problems such as poor temperature stability, large lead pollution, environmental and human hazards, etc., to reduce dielectric loss and improve dielectric Constant, environmentally friendly effect

Inactive Publication Date: 2018-09-04
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In lead-based perovskites such as Pb(ZrTi)O 3 Among other materials, although the dielectric constant of this type of material is very high, the pollution of lead in the process of preparation and use is very large, which will cause harm to the environment and human body.
Traditional K 0.5 Na 0.5 NbO 3 Lead-free ceramics have poor stability at dielectric constant temperatures greater than 200°C due to phase transitions around 200°C and 410°C

Method used

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  • Wide temperature range type high-temperature lead-free ceramic capacitor material and preparation method
  • Wide temperature range type high-temperature lead-free ceramic capacitor material and preparation method
  • Wide temperature range type high-temperature lead-free ceramic capacitor material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) According to the chemical formula, it is 0.92(K 0.5 Na 0.5 )NbO 3 -0.90LiNbO 3 -0.02SrTiO 3 , weigh the corresponding oxide (Nb 2 o 5 and TiO 2 ) and carbonate (K 2 CO 3 、Na 2 CO 3 , Li 2 CO 3 and SrCO 3 ) raw materials, mixed by ball milling, dried, pressed into a column and kept warm at 1100 degrees Celsius for 2 hours, and ground to obtain powder particles for later use;

[0019] (2) Prepare 0.02(Bi 0.5 Li 0.5 )ZrO 3 -0.02CuO, first use analytically pure bismuth nitrate, lithium nitrate, and copper nitrate to weigh the ingredients at a ratio of 1:1:2, dissolve them in ethylene glycol monomethyl ether, and the mass of ethylene glycol monomethyl ether is 3% of the ingredients. times, a homogeneous solution (A solution) was obtained;

[0020] (3) Then according to the Bi:Zr molar ratio of 1:2, measure the corresponding amount of tetrabutyl zirconate with a graduated cylinder and dissolve it in absolute ethanol. The volume of ethanol is 3 times the v...

Embodiment 2

[0027] (1) According to the chemical formula, it is 0.92(K 0.5 Na 0.5 )NbO 3 -0.89LiNbO 3 -0.03SrTiO 3 , weigh the corresponding oxide (Nb 2 o 5 and TiO 2 ) and carbonate (K 2 CO 3 、Na 2 CO 3 , Li 2 CO 3 and SrCO 3 ) raw materials, mixed by ball milling, dried, pressed into a column and kept warm at 1120 degrees Celsius for 2 hours, and ground to obtain powder particles for later use;

[0028] (2) Prepare 0.04(Bi 0.5 Li 0.5 ) ZrO 3 -0.03CuO, first use analytically pure bismuth nitrate, lithium nitrate, and copper nitrate to weigh the ingredients according to 2:2:3, dissolve them in ethylene glycol monomethyl ether, and the mass of ethylene glycol monomethyl ether is 4% of the ingredients. times, a homogeneous solution (A solution) was obtained;

[0029] (3) Then according to the Bi:Zr molar ratio of 1:2, measure the corresponding amount of tetrabutyl zirconate with a graduated cylinder and dissolve it in absolute ethanol. The volume of ethanol is 4 times the v...

Embodiment 3

[0036] (1) According to the chemical formula, it is 0.92(K 0.5 Na 0.5 )NbO 3 -0.88LiNbO 3 -0.04SrTiO 3 , weigh the corresponding oxide (Nb 2 o 5 and TiO 2 ) and carbonate (K 2 CO 3 、Na 2 CO 3 , Li 2 CO 3 and SrCO 3 ) raw materials, mixed by ball milling, dried, pressed into a column and kept at 1140 degrees Celsius for 2 hours, and ground to obtain powder particles for later use;

[0037] (2) Prepare 0.06(Bi 0.5 Li 0.5 )ZrO 3 -0.04CuO, first use analytically pure bismuth nitrate, lithium nitrate, and copper nitrate to weigh the ingredients according to 3:3:4, dissolve them in ethylene glycol monomethyl ether, and the mass of ethylene glycol monomethyl ether is 5% of the ingredients. times, a homogeneous solution (A solution) was obtained;

[0038] (3) Then according to the Bi:Zr molar ratio of 1:2, use a graduated cylinder to measure the corresponding amount of tetrabutyl zirconate and dissolve it in absolute ethanol. The volume of ethanol is 5 times the volum...

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Abstract

The invention discloses a wide temperature range type high-temperature lead-free ceramic capacitor material and a preparation method. The ceramic comprises 0.92(K0.5NaO.5) NbO3-(0.92-x)LiNbO3-xSrTiO3-y(Bi0.5Li0.5)ZrO3-zCuO, wherein x ranges from 0.02 to 0.05; y ranges from 0.02 to 0.08; z ranges from 0.02 to 0.05. The high-temperature lead-free ceramic capacitor material is prepared by a sol-gel technology; the temperature stability in a high temperature range is high; the dielectric constant is high and the loss is low in the wide high temperature range; and the material meets different application demands under high temperature environments.

Description

technical field [0001] The invention belongs to the field of electronic information materials, and in particular relates to a high-temperature potassium sodium niobate-based lead-free ceramic capacitor material with a wide temperature range and a preparation method thereof. Background technique [0002] Traditional X7R, X8R, and X9R capacitors are rated at 125°C, 150°C, and 175°C, respectively. These types of capacitors are widely used in electronic circuit systems. With the development of technology, higher requirements are put forward for the use temperature of capacitors. For example, capacitors used in the circuit system of hybrid or electric drive vehicles, aerospace and oil drilling platforms need to be used at temperatures above 200°C. Ideal high-temperature ceramic capacitors have a high dielectric constant (ε r ), wide temperature stability range (generally ±15% dielectric constant change) and low dielectric loss (tanδ). High ε r It is conducive to the miniaturiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/624C04B35/628H01G4/12
CPCC04B35/495C04B35/622C04B35/624C04B35/62823C04B2235/3201C04B2235/3203C04B2235/3213C04B2235/3232C04B2235/3244C04B2235/3281C04B2235/3298C04B2235/602C04B2235/656C04B2235/6567H01G4/1263
Inventor 刘来君严天祥任少凯方亮
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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