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Method for manufacturing PTC (positive temperature coefficient) ceramic

A manufacturing method and ceramic technology, which is applied in the field of PTC ceramic manufacturing, can solve the problems of low temperature coefficient alpha, inaccurate Curie temperature, and poor withstand voltage performance, and achieve accurate Curie temperature, large lift-to-drag ratio, and withstand voltage good performance

Inactive Publication Date: 2012-12-05
刘小强
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Problems solved by technology

Because the synthesis process is to mix the raw materials together and form them at one time, the Curie temperature is inaccurate, the temperature coefficient Alpha is low, the withstand voltage performance is poor, and the lift-to-drag ratio is small.

Method used

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Effect test

Embodiment 1

[0020] The manufacturing method of the PTC ceramic of this embodiment includes the following steps.

[0021] 1) Put BaCO 3 And TiO 2 According to the molar ratio of 1:1.01, mix into the main material of No. 1 material, and then add CaTiO 3 And Nb 2 O 5 , CaTiO 3 The addition amount is 0.1-0.6% (mol%) of the main material of No. 1 material, Nb 2 O 5 The addition amount of No. 1 material is 0.12-0.18% (mol %) of the main material of No. 1 material. After wet ball milling, the material is discharged and filtered, and kept at 1150°C for 2 hours to synthesize No. 1 material.

[0022] 2) Pb 3 O 4 And TiO 2 According to the molar ratio of 1:1, mix into the main material of No. 2 material, and then add Nb 2 O 5 , Nb 2 O 5 The addition amount of No. 2 material is 0.12-0.18% (mol %) of the main material of No. 2 material. After wet ball milling, the material is discharged and filtered and kept at 980°C for 2 hours to synthesize No. 2 material.

[0023] 3) Weigh the first and second materials wi...

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Abstract

The invention relates to a method for manufacturing PTC (positive temperature coefficient) ceramic. The method includes the following steps of firstly, mixing BaCO3 and TiO2 to obtain a first main material according to a certain proportion, adding CaTiO3 and Nb2O5, discharging and performing filter pressing after wet type ball milling, and synthesizing a first material at the high temperature; secondly, mixing Pb3O4 and TiO2 to obtain a second main material according to a certain proportion, adding Nb2O5, discharging and performing filter pressing after wet type ball milling, and synthesizing a second material at the high temperature; and thirdly, mixing the first material and the second material according to a certain proportion, adding auxiliary materials to obtain a third material. Compared with the prior art, the method for manufacturing PTC ceramic has the advantages of accurate Curie temperature, high temperature coefficient alpha, fine voltage withstanding performance, high lift drag ratio and flexibility in preparation, and proportion of the first material and the second material can be directly adjusted according to the required Curie temperature.

Description

Technical field [0001] The invention relates to a manufacturing method of PTC ceramics. Background technique [0002] PTC ceramics are multi-phase and multi-component materials whose composition generally contains PbTiO 3 , BaTiO 3 , CaTiO 3 , SrTiO 3 And a small amount of additives such as: SiO 2 , Sb 2 O 3 , Nb 2 O 5 And MnO 2 Wait. [0003] In the past, when synthesizing PTC ceramics with a specific Curie temperature, the calculated BaCO 3 , TiO 2 And Pb 3 O 4 Mix in proportion, where Pb 3 O 4 PbO can also be used instead. After a certain time of ball milling, after discharging, filtering and drying, it is synthesized at a specific temperature. Add SiO2 and Sb 2 O 3 And MnO 2 Waiting for a small amount of additives, and then ball milling for a certain period of time, spray granulation, tablet molding sintering, grinding tablets, upper electrode, pressure resistance and other series of performance tests, and finally packaging and leaving the factory. The disadvantage of this me...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
Inventor 刘小强
Owner 刘小强
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