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Preparation method of barium strontium titanate dielectric temperature stable ceramic capacitor material

A temperature-stable ceramic capacitor technology, applied in the field of dielectric ceramic capacitor materials, can solve the problems of low dielectric constant, complex synthesis process, and large loss, and achieve good temperature stability, good temperature stability, and low loss.

Inactive Publication Date: 2014-08-06
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

X7R ceramics are 25 o C is benchmarked from -55 o C to 125 o C. The temperature capacity change rate (TCC) of the material is ≤ 15%, and the dielectric loss (DF) is ≤ 2.5%. However, there are many defects in the current method of preparing and synthesizing X7R materials, such as complex synthesis process, low dielectric constant, loss larger

Method used

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  • Preparation method of barium strontium titanate dielectric temperature stable ceramic capacitor material
  • Preparation method of barium strontium titanate dielectric temperature stable ceramic capacitor material
  • Preparation method of barium strontium titanate dielectric temperature stable ceramic capacitor material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. According to the main formula Ba 1-x Sr x TiO 3 , according to the amount of substance 0.9:0.1:1 ratio weigh barium carbonate BaCO 3 , strontium carbonate SrCO 3 , titanium dioxide TiO 20.09mol, 0.01mol and 0.1mol each. Add 0.15wt% Sm 2 o 3 mixed ball mill;

[0042] 2. The ball-milled slurry is dried in a drying oven, ground, compacted in an alumina crucible, and pre-fired;

[0043] 3. The pre-burning heating rate is 200 degrees / hour, 1000 o C pre-fired for 6 hours and cooled naturally in the furnace;

[0044] 4. Secondary ball milling (finishing) of the obtained BST powder, the ball milling speed is 100r / min, and the ball milling time is 6 hours. Then direct 0.05wt% secondary dopant directly in the ball mill tank, as Nb 2 o 5 , Ta 2 o 5 , La 2 o 3 , Fe 2 o 3 , according to the order of description, the ratio is 2:1:2:1, and 1wt% copper oxide CuO and boron oxide B with a ratio of 1:1 2 o 3 As a sintering aid, continue ball milling for 1 hour, and ...

Embodiment 2

[0052] 1. According to the main formula Ba 1-x Sr x TiO 3 , according to the amount of substance 0.9:0.1:1 ratio weigh barium carbonate BaCO 3 , strontium carbonate SrCO 3 , titanium dioxide TiO 2 Each of 0.09mol, 0.01mol and 0.1mol is the main raw material of the material, and 0.15wt% of Sm is added 2 o 3 mixed ball mill;

[0053] 2. The ball-milled slurry is dried in a drying oven, ground, compacted in an alumina crucible, and pre-fired;

[0054] 3. The pre-burning heating rate is 200 degrees / hour, 1000 o C pre-fired for 6 hours and cooled naturally in the furnace;

[0055] 4. Perform secondary ball milling (fine grinding) on ​​the obtained BST, the ball milling speed is 100r / min, and the ball milling time is 6 hours. Then directly add 0.10wt% secondary dopant directly in the ball mill tank, which is Nb 2 o 5 , Ta 2 o 5 , La 2 o 3 , Fe 2 o 3 , according to the order of description, the ratio is 2:1:2:1, and 1wt% copper oxide CuO and boron oxide B with a rati...

Embodiment 3

[0064] 1. According to the main formula Ba 1-x Sr x TiO 3 , according to the amount of substance 0.9:0.1:1 ratio weigh barium carbonate BaCO 3 , strontium carbonate SrCO 3 , titanium dioxide TiO 2 Each of 0.09mol, 0.01mol and 0.1mol is the main raw material of the material. Add 0.15wt% Sm 2 o 3 mixed ball mill;

[0065] 2. The ball-milled slurry is dried in a drying oven, ground, compacted in an alumina crucible, and pre-fired;

[0066] 3. The pre-burning heating rate is 200 degrees / hour, 1000 o C pre-fired for 6 hours and cooled naturally in the furnace;

[0067] 4. Perform secondary ball milling (fine grinding) on ​​the obtained BST, the ball milling speed is 100r / min, and the ball milling time is 6 hours. Then directly direct 0.15wt% secondary dopant in the ball mill tank, which is Nb 2 o 5 , Ta 2 o 5 , La 2 o 3 , Fe 2 o 3 , according to the order of description, the ratio is 2:1:2:1, and 1wt% copper oxide CuO and boron oxide B with a ratio of 1:1 2 o 3 ...

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Abstract

The invention discloses a strontium barium titanate-based dielectric temperature stable ceramic capacitor material and a preparation process. Its material composition is Ba1-xSrxTiO3+Awt% primary rare earth dopant + Bwt% secondary dopant + Cwt% sintering aid, A, B, and C are calculated based on Ba1-xSrxTiO3 as 100%; the process steps are as follows Ba1-xSrxTiO3+Awt% primary rare earth dopant weighing, direct ball milling, drying, and calcination to obtain the rare earth-doped main ceramic material; secondary fine grinding, adding secondary dopant and sintering aid, and then The steps of molding, calcination, cleaning, electrode loading, and testing complete the product. Its performance is that the dielectric constant at 25oC is greater than 4300, and the dielectric loss in the test temperature range is lower than 0.025. By controlling the formula ratio and preparation process, the dielectric constant temperature stability and loss of the material can meet the X6R and X7R standards in the EIA standard, and even the more stringent Y6P and Z5E standards for temperature stability.

Description

technical field [0001] The invention belongs to dielectric ceramic capacitor materials, in particular to a method for preparing a strontium barium titanate-based temperature-stable ceramic material for chip capacitors. Background technique [0002] With the rapid development of the electronics industry, electronic products such as smartphones, tablet computers, notebook computers, portable digital assistants, and military advanced communication equipment are being updated more and more frequently. Low cost is undoubtedly the trend of its development, so electronic products have stricter requirements on the performance of the components it assembles. The research and development of Multi-Layer Ceramic Capacitors (MLCCs) materials complies with the development needs of the current electronics industry. At the end of 2004, the global MLCC production exceeded 700 billion pieces, becoming the absolute main body of capacitor components. [0003] Capacitive temperature stable MLCC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 曹万强陈威杨向荣刘培朝邱超群
Owner HUBEI UNIV