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Ultrathin chip ceramic positive temperature coefficient (PTC) thermistor and manufacturing method thereof

A positive temperature coefficient, thermistor technology, applied in the direction of resistors with positive temperature coefficients, resistor manufacturing, resistors, etc., can solve the problem that there is no ultra-thin ceramic PTC resistor, etc., to meet market demand, small assembly space , the effect of controlling the thickness

Inactive Publication Date: 2012-04-25
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the production process of ceramic PTC, it is difficult to achieve miniaturization and thinning in terms of the precision of molds and equipment in the traditional tablet molding process. At present, there is no ultra-thin ceramic PTC resistor on the market.

Method used

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  • Ultrathin chip ceramic positive temperature coefficient (PTC) thermistor and manufacturing method thereof
  • Ultrathin chip ceramic positive temperature coefficient (PTC) thermistor and manufacturing method thereof
  • Ultrathin chip ceramic positive temperature coefficient (PTC) thermistor and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] With a certain PTC powder used in mature products as raw material, add analytical pure organic solvent 548C additive, according to PTC powder 40%, solvent 40%, adhesive 18%, dispersant 0.5%, plasticizer 1.45%, The ratio of 0.05% defoamer, weighed 100g in total and put it into the ball mill jar, the ball-to-material ratio was controlled at 2:1, and the ball milled at a speed of 180 rpm for 24 hours before discharging.

[0031] The cast material is coated on a flat plate with a cast equipment, and the thickness of the single-layer film surface is measured to be 20-30um, cast to 0.58-0.62mm and dried to form a PTC green film sheet 100, such as figure 1 As shown in the top view structural diagram of the green film sheet of the present invention, marking points 101 are marked on the PTC green film sheet 100, and the PTC green film sheet 100 is cut into a 3.76*1.88mm piece-type PTC102, and after peeling off, deglue at 510°C8 hour, and then sintered at 1350°C to form a sheet-t...

Embodiment 2

[0035] like image 3 It is another ultra-thin ceramic PTC thermistor structure schematic diagram shown in the side section of another form of the present invention, another ultra-thin ceramic PTC thermistor structure. The formula is: PTC powder 50%, solvent 35%, binder 13%, dispersant 0.5%, plasticizer 1.45%, defoamer 0.05%. After being made into slurry by ball milling, the PTC green film is made by coating process, such as figure 1 As shown, mark and cut into chip PTC102', and finally coat silver paste on the upper and lower surfaces of chip PTC102' ceramics, sinter to obtain ohmic electrode 104 and surface electrode 103, and other processes are the same as in embodiment 1.

Embodiment 3

[0037] Others are all the same as Example 1, but the formula is different, PTC powder 45%, solvent 30%, binding agent 23%, dispersant 0.5%, plasticizer 1.45%, defoamer 0.05%.

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Abstract

The invention relates to a chip ceramic positive temperature coefficient (PTC) thermistor and in particular relates to an ultrathin chip ceramic PTC thermistor and a manufacturing method thereof. The thermistor has the advantages of saving the assembly space, increasing the yield and having no influence on the electrical property. The ultrathin chip ceramic PTC thermistor is characterized in that a traditional barium titanate ceramic PTC film is taken as the intermediate substrate; electrodes are coated at the two ends or on the two sides of the film; the thermistor has the same resistivity and Curie temperature as the traditional PTC thermistors; and the size of the thermistor is (3.10-3.13)*(1.58-1.61)*0.50+ / -0.01mm. The invention also provides the manufacturing method of the ultrathin chip ceramic PTC thermistor. According to the manufacturing method, a film casting or coating process is adopted, so that the thickness of the film can be effectively controlled, the formed film is very thin, and 0603 type products and even smaller products can be manufactured based on the chip sizes after sintering, thus being suitable for a smaller assembly space.

Description

technical field [0001] The invention relates to a chip-type ceramic positive temperature coefficient thermistor, in particular to an ultra-thin chip-type ceramic positive temperature coefficient thermistor which saves assembly space, improves output and does not affect electrical performance and a manufacturing method thereof. Background technique [0002] Nowadays, the electronic industry is developing rapidly, and various electronic products emerge in endlessly, and the requirements for products are getting higher and higher. Miniaturization is a trend in the development of electronic products. Therefore, ceramic PTCs also need to follow the trend and develop in the direction of miniaturization and thinning. [0003] However, due to the production process of ceramic PTC itself, it is difficult to achieve miniaturization and thinning in terms of the precision of molds and equipment in the traditional tablet molding process. At present, there is no ultra-thin ceramic PTC res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01C17/065
Inventor 钱朝勇张子川杨彬
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD