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Process for producing high temperature and pressure resistant PTC (Positive Temperature Coefficient) thermistor ceramics

A thermistor and production process technology, applied in the field of electronic component preparation, can solve the problems of uneven dispersion of PTC thermistor ceramic components, uneven grain size, poor voltage resistance performance, etc., to achieve low attenuation performance, The effect of uniform dispersion of components and high alpha coefficient

Inactive Publication Date: 2013-11-27
HAINING YONGLI ELECTRONICS CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high temperature and high pressure resistant PTC thermistor ceramics produced by this process have uneven dispersion, uneven grain size, low α coefficient, and poor withstand voltage performance.
Fatal defects such as thermal breakdown are prone to occur when used in air-conditioning auxiliary heaters or other heaters with high requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of material A:

[0038] 1) Material preparation: take 17.169Kg BaCO respectively 3 , 7236.0g TiO 2 、30.387gY 2 o 3 , 269.285g CaCO 3 ;

[0039] 2) Pre-mixing and filtering to remove iron: Put the weighed raw materials into the pre-mixing tank, add 34Kg deionized water and 169.9g dispersant, stir for 30 minutes, and send it to the circulating stirring system after filtering and removing iron;

[0040] 3) Circulating stirring and grinding, filtering and iron removal: Add 150Kg granular zirconia ceramic balls with a diameter of 5mm in the circulating mixing tank, and carry out cyclic grinding of the pre-stirred slurry, and the circulating flow rate is controlled at 5.0m 3 , the grinding speed is controlled at 200 rpm, and the grinding time is 300 minutes; after filtering and removing iron, it is sent to a filter press;

[0041] 4) Press filter dehydration: filter and dehydrate the above slurry with a filter press;

[0042] 5) Calcination synthesis: the...

Embodiment 2

[0056] (1) Preparation of material A:

[0057] 1) Material preparation: take 17.169Kg BaCO respectively 3 , 7477.3gTiO 2 , 12.441g Y 2 o 3 , 223.947g CaCO 3 ;

[0058] 2) Pre-mixing and filtering to remove iron: Put the weighed raw materials into the pre-mixing tank, add 25Kg deionized water and 74.65g dispersant, stir for 20 minutes, and send it to the circulating stirring system after filtering and removing iron;

[0059] 3) Circulating stirring and grinding, filtering and iron removal: add 150Kg granular zirconia ceramic balls with a diameter of 5mm in the circulating mixing tank, and carry out cyclic grinding of the pre-stirred slurry, and the circulating flow rate is controlled at 4.5m 3 , the grinding speed is controlled at 180 rpm, and the grinding time is 250 minutes; after filtering and removing iron, it is sent to a filter press;

[0060] 4) Press filter dehydration: filter and dehydrate the above slurry with a filter press;

[0061] 5) Calcination synthesis: ...

Embodiment 3

[0075] (1) Preparation of material A:

[0076] 1) Material preparation: take 17.169Kg BaCO respectively 3 , 6696.2gTiO 2 , 26.6g Y 2 o 3 , 290.184g CaCO 3 ;

[0077] 2) Pre-mixing and filtering to remove iron: Put the weighed raw materials into the pre-mixing tank, add 36.3Kg deionized water and 169.27g dispersant, stir for 40 minutes, and send it to the circulating stirring system after filtering to remove iron;

[0078] 3) Circulating stirring and grinding, filtering and iron removal: Add 150Kg granular zirconia ceramic balls with a diameter of 5mm in the circulating mixing tank, and carry out cyclic grinding of the pre-stirred slurry, and the circulating flow rate is controlled at 5m 3 , the grinding speed is controlled at 220 rpm, and the grinding time is 200 minutes; after filtering and removing iron, it is sent to a filter press;

[0079] 4) Press filter dehydration: filter and dehydrate the above slurry with a filter press;

[0080] 5) Calcination synthesis: the ...

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Abstract

The invention relates to the technical field of preparation of electronic components and devices and particularly relates to high temperature and pressure resistant PTC (Positive Temperature Coefficient) thermistor ceramics for heating and a production process thereof. The process comprises the steps of preparing a material A from BaCO3, TiO2, Y2O3 and CaCO3 through the processes of material preparation, pre-stirring, filtering for iron removal, cyclic stirring and grinding, filtering for iron removal, pressure-filtration dehydration, calcining synthesis and the like, preparing a material B from Pb3O4, TiO2 and Nb2O5 through the processes of material preparation, pre-stirring, filtering for iron removal, cyclic stirring and grinding, filtering for iron removal, pressure-filtration dehydration, calcining synthesis and the like, and preparing the high temperature and pressure resistant PTC thermistor ceramics from a mixture of the material A, the material B, SiO2 and adjuvants through the processes of material preparation, ball-milling material mixing, filtering for iron removal, cyclic stirring and grinding, filtering for iron removal, spray granulating and the like. The high temperature and pressure resistant PTC thermistor ceramics disclosed by the invention have the characteristics of uniform ingredient dispersion, uniform crystal grain size, higher voltage resistance, lower attenuation performance, higher alpha coefficient and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of electronic components, in particular to a production process of high temperature and high pressure resistant PTC thermistor ceramics for heating. Background technique [0002] Positive temperature coefficient thermistor, referred to as PTC thermistor, is a typical semiconductor resistor with temperature sensitivity. When it exceeds a certain temperature, its resistance value increases stepwise with the increase of temperature. PTC thermistor is a sensitive component with early development, various types and mature development. It is widely used in fields related to electronic and electrical temperature control such as batteries, security, medical treatment, scientific research, industrial motors, and aerospace. [0003] When high temperature and high pressure resistant PTC thermistor ceramics are used as heating components, the key characteristics required are high voltage resistance, low p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/46
Inventor 陈建良林晓杰
Owner HAINING YONGLI ELECTRONICS CERAMICS
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