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Temperature stable type high temperature ceramic capacitor medium material, and preparation method thereof

A capacitor dielectric and temperature stable technology, applied in fixed capacitor dielectrics, fixed capacitors, capacitors, etc., can solve problems such as human health and ecological environment hazards, and achieve the effects of low cost, low dielectric loss, and good high-temperature application prospects

Inactive Publication Date: 2019-11-26
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the current high-temperature ceramic capacitor dielectric materials used in the military field contain harmful elements such as lead and cadmium, which will cause serious harm to human health and the ecological environment. Therefore, the development of environmentally friendly high-temperature ceramic capacitor dielectric materials has important social significance

Method used

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  • Temperature stable type high temperature ceramic capacitor medium material, and preparation method thereof

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Effect test

Embodiment 1

[0019] The chemical composition formula of the temperature-stable high-temperature ceramic capacitor dielectric material provided by the present invention is: 0.995 (K 0.5 Na 0.5 )NbO 3 -0.005 LaBiO 3 .

[0020] The specific steps for preparing the above-mentioned temperature-stable high-temperature ceramic capacitor dielectric material are as follows:

[0021] (1) High-purity powder K with a purity greater than 99% 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , La 2 o 3 and Bi 2 o 3 As a starting material, put it in an oven at 120°C for 10 hours, and after drying, according to 0.995 (K 0.5 Na 0.5 )NbO 3 -0.005 LaBiO 3 The stoichiometric ratio is accurately weighed (accurate to 4 decimal places); put the weighed raw material powder into a nylon ball mill jar and use absolute ethanol and zirconia balls as ball milling media on a planetary ball mill at 360 rpm Minute speed ball milling for 6 hours to obtain uniformly mixed slurry A; place the uniformly mixed slurry A in a watch...

Embodiment 2

[0024] The chemical composition formula of the temperature-stable high-temperature ceramic capacitor dielectric material provided by the present invention is: 0.995 (K 0.5 Na 0.5 )NbO 3 -0.005 LaBiO 3 .

[0025] The specific steps for preparing the above-mentioned temperature-stable high-temperature ceramic capacitor dielectric material are as follows:

[0026] (1) High-purity powder K with a purity greater than 99% 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , La 2 o 3 and Bi 2 o 3 As a starting material, put it in an oven at 120°C for 24 hours, and after drying, according to 0.995 (K 0.5 Na 0.5 )NbO 3 -0.005 LaBiO 3 The stoichiometric ratio is accurately weighed (4 digits after the decimal point); put the weighed raw material powder into a nylon ball mill jar and use absolute ethanol and zirconia balls as ball milling media on a planetary ball mill at 360 rpm Speed ​​ball milling for 8 hours to obtain uniformly mixed slurry A; place the uniformly mixed slurry A in a watch ...

Embodiment 3

[0029] The chemical composition formula of the temperature-stable high-temperature ceramic capacitor dielectric material provided by the present invention is: 0.995 (K 0.5 Na 0.5 )NbO 3 -0.005 LaBiO 3 .

[0030] The specific steps for preparing the above-mentioned temperature-stable high-temperature ceramic capacitor dielectric material are as follows:

[0031] (1) High-purity powder K with a purity greater than 99% 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , La 2 o 3 and Bi 2 o 3 As a starting material, put it in an oven at 120°C for 10 hours, and after drying, according to 0.995 (K 0.5 Na 0.5 )NbO 3 -0.005 LaBiO 3 The stoichiometric ratio is accurately weighed (accurate to 4 decimal places); put the weighed raw material powder into a nylon ball mill jar and use absolute ethanol and zirconia balls as ball milling media on a planetary ball mill at 360 rpm Milling at a speed of 10 minutes for 10 hours to obtain uniformly mixed slurry A; place the uniformly mixed slurry A in...

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Abstract

The invention provides a temperature stable type high temperature ceramic capacitor medium material, and a preparation method thereof, and belongs to the technical field of ceramic capacitor material.The chemical formula of the temperature stable type high temperature ceramic capacitor medium material is 0.995(K<0.5>Na<0.5>)NbO<3>-0.005LaBiO<3>. The preparation method comprises following steps: araw material powder is dried and weighted accurately according to the stoichiometric ratio; ball milling is carried out to obtain a slurry; the slurry is dried, and grinded into powder, and is subjected to pressing into a cylindrical body, and the formed cylindrical body is subjected to pre-sintering; after pre-sintering, grinding is carried out to obtain a powder, ball milling is carried out toobtain a slurry material, the slurry material is dried and grinded into a powder material, a polyvinyl alcohol aqueous solution is taken as a binder for granulation, and pressing is carried out to obtain a cylindrical sample product, and at last high temperature degluing and sintering are carried out to obtain a finished product. The material is high and stable in relative dielectric constant, andlow in dielectric loss; technology is simple; cost is relatively low; sintering temperature is moderate; the raw material contains no toxic substance; and the high temperature application prospect ispromising.

Description

【Technical field】 [0001] The invention relates to the technical field of ceramic capacitor materials, in particular to a temperature-stable high-temperature ceramic capacitor dielectric material and a preparation method thereof. 【Background technique】 [0002] In very harsh working environments such as automotive electronics, aerospace and oil well exploration, high-temperature ceramic capacitors need to be used, such as military electronic equipment such as brake anti-lock braking systems and aero-engine systems installed in the engine compartment of automobiles. over 200°C. The upper limit temperature of traditional EIA X7R and X8R ceramic capacitors is 125°C and 150°C respectively, which cannot meet the temperature requirements of these working environments. Therefore, it is very necessary to develop high-temperature ceramic capacitor dielectric materials that can work above 200°C. In order to ensure that high-temperature ceramic capacitors can work stably within the ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/626C04B35/634C04B35/638H01G4/12
CPCC04B35/495C04B35/622C04B35/6261C04B35/62645C04B35/62695C04B35/63416C04B35/638C04B2235/3201C04B2235/3227C04B2235/3251C04B2235/3298C04B2235/602C04B2235/6562C04B2235/6567H01G4/1209H01G4/1254
Inventor 严天祥陈开远张朗萍刘来君方亮
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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