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Method for producing positive temperature coefficient thermistor for surge suppressor

A positive temperature coefficient, surge suppressor technology, applied in the field of electronic ceramics, can solve the problem that the surge suppressor cannot fully meet the withstand voltage and other problems

Inactive Publication Date: 2009-05-13
DANDONG GUOTONG ELECTRONICS COMPONENTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PTCR currently produced is in the range of small size (diameter less than 6mm), and its key performance voltage resistance is less than AC650V, which cannot fully meet the demand for high voltage resistance of surge suppressors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Raw material molar ratio:

[0019] TiO 2 1.011

[0020] BaCO 3 0.755

[0021] CaCO 3 0.155

[0022] SrCO 3 0.090

[0023] Y 2 o 3 0.006

[0024] SiO 2 0.017

[0025] MnO 2 0.0008

[0026] Production preparation method:

[0027] 1. Material drying, put all the ingredients into the drying box, and dry for 1-4 hours at 120±5°C;

[0028] 2. Weighing, weighing according to the proportion;

[0029] 3. Ball milling: use a ball mill for the weighed material, carry out ball milling for 10-24 hours according to material: agate ball: deionized water=1: 1.5: 1.5, and dry at 120°C after grinding;

[0030] 4. Pre-fired synthesis: Dry and press the ball-milled material into a cylindrical shape, and heat it at 1170±10°C for 2 hours to carry out pre-fired synthesis.

[0031] 5. Secondary ball milling and mixing, the pre-fired materials are ball milled for 10-24 hours with a ball mill; after grinding, dry at 120°C;

...

Embodiment 2

[0041] Raw material molar ratio:

[0042] TiO 2 1.011

[0043] BaCO 3 0.761

[0044] CaCO 3 0.145

[0045] SrCO 3 0.094

[0046] Y 2 o 3 0.006

[0047] SiO 2 0.017

[0048] MnO 2 0.0008

[0049] The production and preparation methods are the same as those described above.

Embodiment 3

[0051] Raw material molar ratio:

[0052] TiO 2 1.011

[0053] BaCO 3 0.764

[0054] CaCO 3 0.140

[0055] SrCO 3 0.096

[0056] Y 2 o 3 0.006

[0057] SiO 2 0.017

[0058] MnO 2 0.0008

[0059] The production preparation method is the same as previously described:

[0060] The advantage of the present invention is that all environmentally friendly materials are used, that is, lead oxide (PbO) is not used. The product meets the international environmental protection requirements and improves the withstand voltage capability. When the diameter is less than 6mm, the withstand voltage capability is greater than AC700V, and the resistivity is 190~220Ω·Cm , can more fully meet and adapt to the use requirements of surge suppressors.

[0061] The test results of the samples according to GB / T7153-2002 are as follows:

[0062] Example Voltage withstand capability Room temperature resistivity Curie temperature Example ① AC75...

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Abstract

The invention relates to a method for producing a positive temperature coefficient thermistor for a surge suppressor. The compositions of raw materials in molar ratio are as follows: 1.011 percent of TiO2, 0.755 to 0.764 percent of BaCO3, 0.140 to 0.155 percent of CaCO3, 0.090 to 0.096 percent of SrCO3, 0.006 percent of Y2O3, 0.017 percent of SiO2, and 0.0008 percent of MnO2. When the diameter of the positive temperature coefficient thermistor prepared by the method is less than 6 millimeters, the voltage withstanding capacity is more than AC700V, and the resistivity is between 180 and 220 omega.Cm, thus the method can fully meet and adapt to the use requirements of the surge suppressor.

Description

technical field [0001] What the present invention relates to is electronic ceramic technology, particularly a kind of BaTiO 3 Based on positive temperature coefficient thermistor (referred to as PTCR) production method. Background technique [0002] At present, the material used in the production of PTCR is mainly titanium dioxide (TiO 2 ), barium carbonate (BaCO 3 ), calcium carbonate (CaCO 3 ), strontium carbonate (SrCO 3 ), lead oxide (PbO), yttrium oxide (Y 2 o 3 ), silicon dioxide (SiO 2 ), manganese dioxide (MnO 2 ). The production of PTCR products has very strict requirements on the ratio of materials, and the difference in the ratio of materials will obviously affect the performance indicators of the product. The PTCR currently produced is in the small size (diameter less than 6mm), and its key performance withstand voltage is less than AC650V, which cannot fully meet the high voltage withstand requirements of surge suppressors. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 刘文磊王斌侯文平
Owner DANDONG GUOTONG ELECTRONICS COMPONENTS
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