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Ceramic PTC thermistor element and preparation method thereof

A thermistor element and ceramic technology, which is applied in the field of ceramic PTC thermistor element and its preparation, can solve the problems of inability to make adjustments according to requirements, inaccurate proportions of ingredients, poor product performance stability, etc., and achieve pressure resistance Excellent, stable product performance, good resistance consistency

Active Publication Date: 2017-03-15
SHENZHEN JINKE SPECIAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defects of this process are: due to the volatilization of Pb during the synthesis process, the proportion of the original ingredients is inaccurate, the surface temperature drifts, the heating rate is affected, and the product performance stability is poor.
Moreover, since the surface temperature has basically been finalized during the first batching, it cannot be adjusted as required during the second batching, and the batching is not flexible

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0009] The invention provides a kind of preparation method of ceramic PTC thermistor element, comprises the steps:

[0010] Step 1, with BaCO 3 , CaCO 3 、TiO 2 The main raw material is mixed with the first semiconducting agent, wet ball milled for a predetermined time, filtered and dried, and pre-calcined to synthesize No. 1 main raw material. In this embodiment, the predetermined time of the wet ball milling is 20h-24h. In addition, the synthesis temperature of the No. 1 main ingredient is 1130°C-1150°C, and the synthesis time is 2h-3h.

[0011] Step 2, with Pb 3 o 4 、TiO 2 The main raw material is mixed with the second semiconducting agent, wet ball milled for the predetermined time, filtered and dried, and pre-calcined to synthesize No. 2 main raw material. Wherein, the first semiconducting agent or the second semiconducting agent includes trivalent or pentavalent rare earth trace elements. Specifically, in this embodiment, the first semiconducting agent is antimony...

no. 1 example

[0016] No. 1 major ingredient preparation comprises the following steps:

[0017] (1) Weigh raw materials: BaCO 3 : 69.5089Kg, CaCO 3 : 1.0903Kg, TiO 2 : 29.1886Kg, Sb 2 o 3 :0.0635Kg, Nb 2 o 5 : 0.1158Kg, Y 2 o 3 : 0.0328Kg;

[0018] (2) Pour these six kinds of raw materials into a ball mill tank, add deionized water and wet ball mill for 24 hours;

[0019] (3) After pressure filtration and drying, put it into a crucible for pre-calcination reaction synthesis, the synthesis temperature is 1150°C, and the synthesis time is 2h.

[0020] No. two main material preparation comprises the following steps:

[0021] (1) Weigh raw materials: Pb 3 o 4 : 74.4281Kg, TiO 2 : 25.4457Kg, Nb 2 o 5 : 0.1262Kg;

[0022] (2) Pour these three kinds of raw materials into a ball mill tank, add deionized water and wet ball mill for 24 hours;

[0023] (3) After pressure filtration and drying, put it into a sagger for pre-calcination reaction synthesis, the synthesis temperature is 95...

no. 2 example

[0031] The preparation process of the second embodiment is roughly the same as that of the first embodiment, the difference is that:

[0032] Finished product preparation includes the following steps:

[0033] (1) Weigh No. 1 main ingredient: 139.1165g;

[0034] (2) Weigh No. 2 main ingredient: 60.8835g;

[0035] (3) Weigh Al 2 o 3 : 2.0462g, SiO 2 : 1.2057g, BN: 0.6973g, measure 50% concentration Mn(NO 3 ) 2 Solution: 0.1119ml;

[0036] (4) Add deionized water to the above materials and dry them after wet ball milling for 24 hours, add an appropriate amount of PVA binder to mix and granulate;

[0037] (5) Dry pressing molding, sintering the formed piece in a kiln at 1260°C for 1 hour to form porcelain, after the grinding piece is cleaned, the electrode is applied to prepare the finished product.

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PUM

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Abstract

The present invention discloses a ceramic PTC thermistor element preparation method, which comprises: adopting BaCO3, CaCO3 and TiO2 as main raw materials, mixing with a first semiconducting agent, carrying out wet ball milling for a predetermined time, carrying out pressure filtration and drying, carrying out a pre-burning reaction to synthesize a main material 1, adopting Pb3O4 and TiO2 as main raw materials, mixing with a second semiconducting agent, carrying out wet ball milling for a predetermined time, carrying out pressure filtration and drying, carrying out a pre-burning reaction to synthesize a main material 2, mixing the main material 1, the main material 2, a dopant, a sintering auxiliary agent and the like, correcting the surface temperature parameter by adding a specific amount of a moving agent or adjusting the proportion of the sintering auxiliary agent, carrying out wet ball milling for a predetermined time, and carrying out granulation, forming, sintering, electrode to prepare the finished product. The present invention further discloses the ceramic PTC thermistor element.

Description

technical field [0001] The invention relates to thermistor technology, in particular to a ceramic PTC thermistor element and a preparation method thereof. Background technique [0002] PTC (full name Positive Temperature Coefficient) thermistor ceramic is a semiconductor functional ceramic with a positive temperature coefficient. Before the transition temperature (Tc) of PTC thermistor ceramics, the resistance decreases with the increase of temperature; before the temperature increases from the transition temperature to the design maximum temperature, the resistance increases significantly with the increase of temperature, which is the PTC effect. Using the PTC effect, ceramic PTC thermistor elements for different purposes can be manufactured according to different temperature coefficients. For example, PTC heating components for curling irons, hair straighteners and other hair irons use PTC as a heating element, which has the feature of automatic temperature control and is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/472C04B35/622
Inventor 郜长福龙晓琴宋文杰
Owner SHENZHEN JINKE SPECIAL MATERIALS CO LTD
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