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BaTiO3-based PTC thermal sensitive ceramic material and preparation method thereof

A heat-sensitive ceramic, bi2o3 technology, applied to resistors with a positive temperature coefficient, etc., can solve problems such as the reduction of the efficiency of the Curie temperature increase, the limited increase of the Curie temperature, and the increase of the room temperature resistivity of the ceramic sample. , to achieve the effect of low room temperature resistivity, good repeatability and good PTC effect

Inactive Publication Date: 2012-05-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the aforementioned BaTiO 3 -Bi 0.5 Na 0.5 TiO 3 System ceramics also have their own shortcomings: that is, when Bi 0.5 Na 0.5 TiO 3 When the content exceeds 2mol%, the ceramic samples fired in the air atmosphere are difficult to semiconduct at room temperature
[0005] In addition, although Bi 0.5 Na 0.5 TiO 3 The Curie temperature of barium titanate is as high as 320°C, and at low doping concentration, the Curie temperature of barium titanate can be significantly increased; however, at high concentration doping, the efficiency of increasing the Curie temperature is significantly reduced. In addition, it also makes The room temperature resistivity of the ceramic sample increases significantly
Therefore, the simple direct doping of Bi 0.5 Na 0.5 TiO 3 Adding barium titanate to its ceramic Curie temperature has a limited degree of improvement

Method used

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  • BaTiO3-based PTC thermal sensitive ceramic material and preparation method thereof
  • BaTiO3-based PTC thermal sensitive ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Weigh BaCO according to the molar ratio of 0.96:0.002:0.002 3 、 Bi 2 o 3 , and K 2 CO 3 , mixed to form mixture A, then, weigh TiO 2 , the TiO 2 Mix with mixture A according to the molar ratio of 1:1 to form mixture B;

[0024] Step 2: Weigh the mixture B obtained in Step 1 according to the mass ratio of 1:1:2.5, as well as zirconium balls and deionized water, place it in a ball mill jar for ball milling for 10 hours, move it into an oven, and dry it at 100°C. Then, transfer it to a high-temperature electric furnace and keep it warm at 1100°C for 2 hours to form a pre-mixture, which is set aside;

[0025] Step 3: Take the main material mixture B as 1 mol, and weigh Nb accounting for 0.3 mol% of the main material according to the molar percentage 2 o 5 , accounting for 0.2mol% of the main material Y 2 o 3 , 0.02mol% Mn(NO 3 ) 2 , and 0.2mol% of Sb in the main material 2 o 3 , then, the above Nb 2 o 5 , Y 2 o 3 , Mn(NO 3 ) 2 , and Sb 2 o 3 Ad...

Embodiment 2

[0033] Step 1: Weigh BaCO according to the molar ratio of 0.98:0.001:0.001 3 、 Bi 2 o 3 , and K 2 CO 3 , mixed to form mixture A, then, weigh TiO 2 , the TiO 2 Mix with mixture A according to the molar ratio of 1:1 to form mixture B;

[0034] Step 2: Weigh the mixture B, zirconium balls and deionized water obtained in step 1 according to the mass ratio of 1:1:2.5, place it in a ball mill jar and mill it for 10 hours, then move it into an oven, dry it at 100°C, and then , transferred to a high-temperature electric furnace and kept at 1200°C for 2 hours to form a pre-mixture, and set aside;

[0035] Step 3: Take the main material mixture B as 1 mol, and weigh Nb accounting for 0.15 mol% of the main material according to the molar percentage 2 o 5 , 0.1mol% Y 2 o 3 , 0.025mol% Mn(NO 3 ) 2 , and 0.1mol% Sb 2 o 3 , then, the above Nb 2 o 5 , Y 2 o 3 , Mn(NO 3 ) 2 , and Sb 2 o 3 Add to the premix obtained in step 2, and form the complete batch after mixing;

...

Embodiment 3

[0043] Step 1: Weigh BaCO according to the molar ratio of 0.99:0.005:0.005 3 、 Bi 2 o 3 , and the K 2 CO 3 , mixed to form mixture A, then, weigh TiO 2 , the TiO 2 Mix with mixture A according to the molar ratio of 1:1 to form mixture B;

[0044] Step 2: Weigh the mixture B, zirconium balls and deionized water obtained in step 1 according to the mass ratio of 1:1:2.5, place it in a ball mill jar and mill it for 10 hours, then move it into an oven, dry it at 100°C, and then , transferred to a high-temperature electric furnace and kept at 1230°C for 2 hours to form a pre-composite material for later use;

[0045] Step 3: Take the main material mixture B as 1 mol, and weigh Nb accounting for 0.1 mol% of the main material according to the molar percentage 2 o 5 , 0.05mol% of Y 2 o 3 , 0.02mol% Mn(NO 3 ) 2 , and 0.15 mol% Sb 2 o 3 , then, the above Nb 2 o 5 , Y 2 o 3 , Mn(NO 3 ) 2 , and Sb 2 o 3 Add to the premix obtained in step 2, and form the complete batch...

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Abstract

The invention provides a BaTiO3-based PTC thermal sensitive ceramic material and a preparation method thereof. The thermal sensitive ceramic material comprises the primary materials of TiO2, BaCO3, Bi2O3 and K2CO3 and the auxiliary materials of Nb2O5, Y2O3, Mn(NO3)2 and Sb2O3. The preparation method comprises the following steps of: mixing the primary materials and mixing the primary materials with zirconium ballstones and deionized water and roasting into pre-combined materials, mixing with the auxiliary materials, zirconium ballstones and deionized water to form complete dosing, then after mixing the complete dosing with zirconium ballstones and deionized water, ball-milling, drying, prilling and screening to press as samples, then transferring to the high temperature electric furnace in nitrogen atmosphere to raise the temperature and reduce the temperature, changing the in-furnace atmosphere to air with nitrogen when the temperature is reduced to 1100-900 DEG C and maintaining thetemperature, then cooling along with the furnace and finally coating the electrode slurry to obtain the PTC thermal sensitive ceramic material. The ceramic material prepared by the method has higher room temperature which achieves 185 DEG C maximally, is non-poisonous and has low room temperature resistivity.

Description

【Technical field】 [0001] The present invention relates to a kind of PTC thermosensitive ceramic material and preparation method thereof, especially a kind of BaTiO 3 PTC-based thermosensitive ceramic material and preparation method thereof. 【Background technique】 [0002] Currently commercially produced BaTiO for high temperature conditions (above 120°C) 3 All positive temperature coefficient (PTC) thermosensitive ceramics contain lead. This lead-containing high-temperature PTC ceramic material will cause harm to people and the environment during production and use. The European Union also issued a strict ban on lead-containing substances in electronic ceramics in 2006. In the usage regulations, therefore, the development of lead-free high-temperature BaTiO 3 PTC-based thermosensitive ceramic materials are imminent. [0003] At present, many scholars have studied the lead-free high-temperature BaTiO 3 PTC-based thermosensitive ceramics have been extensively studied. For...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/622H01C7/02
Inventor 蒲永平韦继锋毛玉琴
Owner SHAANXI UNIV OF SCI & TECH
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