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A kind of ultra-wide temperature stable dielectric ceramic and its preparation method

A dielectric ceramic and stable technology, which is applied in the field of ceramic capacitor dielectric materials and preparation, can solve the problems of deterioration of capacitance temperature stability and achieve the effects of stable capacitance temperature coefficient, energy saving and low cost

Active Publication Date: 2016-09-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since BaTiO 3 Curie point limitation, when the temperature is higher than 200 °C, even the modified BaTiO 3 Capacitor temperature stability also deteriorates dramatically

Method used

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  • A kind of ultra-wide temperature stable dielectric ceramic and its preparation method
  • A kind of ultra-wide temperature stable dielectric ceramic and its preparation method
  • A kind of ultra-wide temperature stable dielectric ceramic and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Ultra-wide temperature stable dielectric ceramic material, the expression is 0.80(Bi 0.5 Na 0.5 )TiO 3 -0.20NaNbO 3 .

[0030] The preparation method of the above-mentioned ultra-wide temperature stable dielectric ceramic comprises the following steps:

[0031] (1) According to the chemical formula 0.80(Bi 0.5 Na 0.5 )TiO 3 -0.20NaNbO 3 , weigh Na respectively according to the molar ratio of 0.3:0.2:0.1:0.8 2 CO 3 、 Bi 2 o 3 , Nb 2 o 5 、TiO 2 Raw material, spare.

[0032] (2) Put the raw materials into a ball mill tank, use zirconia balls and absolute ethanol as the medium, mix and mill them for 26 hours on a ball mill with wet ball milling method; then dry them at 100°C for 24 hours and pre-calcine them. The pre-calcination process is at room temperature Raise the temperature to 800°C at a heating rate of 2°C / min, keep it warm for 2 hours, and cool naturally with the furnace; use zirconia balls and absolute ethanol as the medium, mix and ball mill the ob...

Embodiment 2

[0037] Ultra-wide temperature stable dielectric ceramic material, the expression is 0.75(Bi 0.5 Na 0.5 )TiO 3 -0.25NaNbO 3 .

[0038] The preparation method of the above-mentioned ultra-wide temperature stable dielectric ceramic comprises the following steps:

[0039] (1) According to the chemical formula 0.75(Bi 0.5 Na 0.5 )TiO 3 -0.25NaNbO 3 , weigh Na respectively according to the molar ratio of 0.3125:0.1875:0.125:0.75 2 CO 3 、 Bi 2 o 3 , Nb 2 o 5 、TiO 2 Raw material, spare.

[0040] (2) Put the raw materials into a ball mill tank, use zirconia balls and absolute ethanol as the medium, mix and mill them for 24 hours on a ball mill with wet ball milling method; then dry them at 100°C for 24 hours and pre-calcine them. The pre-calcination process is at room temperature Raise the temperature to 800°C at a heating rate of 2°C / min, keep it warm for 2 hours, and cool naturally with the furnace; use zirconia balls and absolute ethanol as the medium, mix and ball mi...

Embodiment 3

[0045] Ultra-wide temperature stable dielectric ceramic material, the expression is 0.70(Bi 0.5 Na 0.5 )TiO 3 -0.30NaNbO 3 .

[0046] The preparation method of the above-mentioned ultra-wide temperature stable dielectric ceramic comprises the following steps:

[0047] (1) According to the chemical formula 0.70(Bi 0.5 Na 0.5 )TiO 3 -0.30NaNbO 3 , weigh Na respectively according to the molar ratio of 0.325:0.175:0.15:0.70 2 CO 3 、 Bi 2 o 3 , Nb 2 o 5 、TiO 2 Raw material, spare.

[0048] (2) Put the raw materials into a ball mill tank, use zirconia balls and absolute ethanol as the medium, and mix and mill them for 22 hours on the ball mill by wet ball milling method; then dry them at 100°C for 24 hours and pre-calcine them. The pre-calcination process is at room temperature Raise the temperature to 850°C at a heating rate of 2°C / min, keep it warm for 3 hours, and cool naturally with the furnace; use zirconia balls and absolute ethanol as the medium for the obtaine...

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Abstract

The invention provides an ultra-wide temperature stable dielectric ceramic and a preparation method thereof: its chemical formula is (1-x)(Bi 0.5 Na 0.5 )TiO 3 ‑xNaNbO 3 , where x=0.20~0.35, and the temperature change rate in the temperature range of -60~400℃ is less than 20%. The preparation method steps of the ultra-wide temperature stable dielectric ceramic are as follows: (1) Na 2 CO 3 , Bi 2 O 3 , Nb 2 O 5 and TiO 2 As a raw material, put it into a ball mill after the ingredients are mixed and milled by a wet ball milling method, and then dry and pre-calcinate to obtain a ceramic powder; (2) Add a binder to the ceramic powder and mix well, and press the ceramic green body; (3) The ceramic green body is debonded and sintered to obtain an ultra-wide temperature stable dielectric ceramic. The method has the advantages of simple preparation process, low cost and no pollution, and the prepared ceramic material has good temperature stability of dielectric constant in an ultra-wide temperature range (-60-400°C).

Description

technical field [0001] The invention relates to the technical field of ceramic materials applied to electronic components, in particular to a ceramic capacitor dielectric material with extremely wide temperature stability and a preparation method. Background technique [0002] Capacitors are an indispensable passive component in modern electronic equipment. It has a series of important functions, such as voltage smoothing, pulse discharge, filtering, coupling, decoupling, power regulation, etc. With the increasing demand for the performance and efficiency of electronic equipment in industrial production, the requirements for capacitor materials are also increasing. In many aspects of industrial electronic equipment, capacitors are required to work stably within a wide temperature range. For example, in electric vehicles, aerospace and other fields, due to the consideration of miniaturization and light weight, electronic devices must be able to work stably in a wide temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 刘韩星许琪李天明郝华曹明贺辛月尧中华
Owner WUHAN UNIV OF TECH
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