BaTiO3-based lead-free PTC (positive temperature coefficient) thermistor ceramic material sintered in reducing atmosphere and preparation method thereof

A thermistor and ceramic material technology, applied in the field of lead-free PTC thermistor ceramic materials, can solve the problems of complex preparation method, no PTC performance, etc., and achieve the effect of simple preparation method, low cost and increasing Curie temperature

Active Publication Date: 2014-09-10
盐城青墩津邦水务有限公司
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  • Description
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Problems solved by technology

Generally, after treatment in a reducing atmosphere, there will be a large number of oxygen vacancies, and the oxygen vacancies are BaTiO 3 There are good electron carriers in ceramics, so the sample can obtain low room temperature resistivity, but almost no PTC performance. Therefore, it must be re-oxidized to form a grain boundary insulating layer and grain boundary barrier through oxygen backfilling to obtain PTC. effect, the preparation method is more complicated
[0003] Currently, CuO doped with Ba 0.96 (Bi 0.5 K 0.5 ) 0.04 TiO 3 Ceramic materials are rarely reported

Method used

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  • BaTiO3-based lead-free PTC (positive temperature coefficient) thermistor ceramic material sintered in reducing atmosphere and preparation method thereof

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preparation example Construction

[0022] A kind of BaTiO sintered in reducing atmosphere 3 The preparation method of lead-free PTC thermistor ceramic material comprises the steps:

[0023] Step 1: Preparation of BaTiO 3 and Bi 0.5 K 0.5 TiO 3 Standby: Weigh BaCO according to the molar ratio of 1:1 3 and TiO 2 Mix to form mixture A; weigh Bi according to the molar ratio 1:1:4 2 o 3 , K 2 CO 3 and TiO 2 Mix to form Mixture B.

[0024] Step 2: Mix the mixture A with zirconium balls and deionized water according to the mass ratio of 1:2:(2-2.5), then ball mill in a star ball mill for 3-4 hours, then dry and briquetting, Place in a box furnace at 1150-1250°C for 2-3 hours to obtain pure phase BaTiO 3 Powder: mix mixture B with zirconium balls and deionized water according to the mass ratio of 1:2:(2~2.5), then ball mill in star ball mill for 3~4 hours, then dry and briquetting, Place in a box furnace at 900-950°C for 3-4 hours to obtain a pure phase of Bi 0.5 K 0.5 TiO 3 Powder, spare;

[0025] Ste...

Embodiment 1

[0031] A kind of BaTiO sintered in reducing atmosphere of the present invention 3 Lead-free PTC thermistor ceramic materials, including the main material BaTiO 3 and Bi 0.5 K 0.5 TiO 3 , the molar ratio is 0.96:0.04, the auxiliary material is CuO, and CuO and BaTiO 3 The molar ratio is 0.0005:0.96.

[0032] The aforementioned BaTiO 3 The preparation method of lead-free PTC thermistor ceramic material comprises the following steps:

[0033] Step 1: Preparation of BaTiO 3 Powder and Bi 0.5 K 0.5 TiO 3 Powder standby: weigh BaCO according to the molar ratio of 1:1 3 and TiO 2 Mix to form mixture A; weigh Bi according to the molar ratio 1:1:4 2 o 3 、K 2 CO 3 and TiO 2 Mix to form Mixture B.

[0034] Step 2: Take mixture A, zirconium balls and deionized water, mix them according to the mass ratio of 1:2:2, and then perform ball milling in a star-type ball mill for 3 hours, then dry and briquette, and place in a box-type furnace Insulated at 1150 °C for 3 hours to ...

Embodiment 2

[0041] A kind of BaTiO sintered in reducing atmosphere of the present invention 3 Lead-free PTC thermistor ceramic materials, including the main material BaTiO 3 and Bi 0.5 K 0.5 TiO 3 , the molar ratio is 0.96:0.04, the auxiliary material is CuO, and CuO and BaTiO 3 The molar ratio is 0.0010:0.96.

[0042] The aforementioned BaTiO 3 The preparation method of lead-free PTC thermistor ceramic material comprises the following steps:

[0043] Step 1: Preparation of BaTiO 3 Powder and Bi 0.5 K 0.5 TiO 3 Powder standby: weigh BaCO according to the molar ratio of 1:1 3 and TiO 2 Mix to form mixture A; weigh Bi according to the molar ratio 1:1:4 2 o 3 、K 2 CO 3 and TiO 2 Mix to form Mixture B.

[0044] Step 2: Take the mixture A, zirconium balls and deionized water, mix them according to the mass ratio of 1:2:2.5, and then perform ball milling in a star-type ball mill for 4 hours, dry, and briquette, and then place them in a box furnace. 1250℃ for 2 hours to synthes...

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Abstract

The invention discloses a BaTiO3-based lead-free PTC (positive temperature coefficient) thermistor ceramic material sintered in a reducing atmosphere and a preparation method thereof. The method comprises the following steps: weighing BaCO3 and TiO2, and mixing to form a mixture A; weighing Bi2O3, K2CO3 and TiO2 to form a mixture B; respectively performing ball-milling, drying and briquetting the mixture A and the mixture B, preserving the heat in a box type furnace to obtain pure phase BaTiO3 powder and Bi0.5K0.5TiO3 powder; mixing the two pure phase powder and an auxiliary material CuO to form a mixture; performing ball-milling, drying and granulating to form granules; pressing the granules into a sample, and sintering in the reducing atmosphere. According to the BaTiO3-based lead-free PTC thermistor ceramic material prepared by the preparation method disclosed by the invention, treatment of the oxidation process is not needed, the preparation process is simple, the material cost is low, and the ceramic material has low room temperature electrical resistivity and high resistance kick.

Description

technical field [0001] The invention belongs to the field of lead-free PTC thermistor ceramic materials, in particular to BaTiO sintered in a reducing atmosphere 3 Lead-free PTC thermistor ceramic material and preparation method thereof. technical background [0002] At present, commercial barium titanate-based PTC ceramics contain a large amount of lead. Due to the volatilization of PbO in the preparation process of lead-containing ceramics, it not only causes the deviation of the stoichiometric ratio of ceramic products in the production process, but also reduces the consistency and repeatability of the product. ; And lead can pollute the environment and harm the human body. In 2006, the European Union passed the "Directive on Prohibiting the Use of Certain Hazardous Substances Containing Lead in Electronic and Electrical Equipment" (ROHS Directive), which strictly prohibits the use of lead in the field of electronic ceramics. This requires the development of a new type ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 蒲永平赵娇娇张盼盼
Owner 盐城青墩津邦水务有限公司
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