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Method of regulating ceramic positive temperature coefficient thermistor value

A technology of positive temperature coefficient and thermistor, applied in the direction of resistors with positive temperature coefficient, etc., can solve problems such as not all within the qualified requirements, uneven powder, lower product qualification rate, etc., to improve resistance Pressure performance, improve product resistance, the effect of small lift-to-drag ratio

Inactive Publication Date: 2004-12-22
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the uneven temperature distribution in the furnace body and the uneven composition of the powder itself, and the actual temperature in the furnace body also fluctuates up and down in the same sintering procedure, and the daily environmental temperature changes will also affect the final product resistance. The distribution is not all within the qualified requirements range. If the products beyond this range are not further processed, they can only be treated as unqualified products, which reduces the qualified rate of the products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] The sintered tiles were treated with different concentrations of Mn(NO 3 ) 2 Solution (0.02g / cm 3 , 0.04g / cm 3 , 0.06g / cm 3 ) for 5 minutes, and then treat the tiles at 850°C, and then use electrodes to test the electrical properties. The test method is shown in Table (1). Compared with the tiles that have not been treated above, the comparison results are shown in Table (2) ) shown.

[0008] 1. Test method

[0009] product performance

testing method

Test Equipment

zero power resistor

The ceramic piece after being well-electroded is placed in an environment of 25±2°C

Measure its resistance after leaving it for an hour. A total of 50 pieces were measured,

Calculate its average resistance value.

Zero Power Resistance Meter

Lift-to-drag ratio

Measure the R-T curves of 10 tiles, take the highest point and the most

Calculate the lift-to-drag ratio of the resistance at the low point, and calculate...

Embodiment 2

[0013] Put the sintered tiles at 0.04 / cm 3 Mn(NO 3 ) 2 Immerse in the solution for 5 minutes, and then treat the tiles at 800°C, 850°C, and 900°C respectively, and then electroded them at the same time as the tiles without the above treatment, and then tested the electrical properties. The comparison results are shown in Table (3). Show.

[0014] product

[0015] It can be seen from the above results that the present invention can adjust the resistance value of the ceramic PTC, and in addition it can also improve the withstand voltage capability of the ceramic PTC thermistor without affecting the lift-resistance characteristic of the PTC thermistor.

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PUM

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Abstract

The invention relates to a method of regulating the resistance value of a ceramic positive temperature coefficient thermosensitive resistance (called 'ceramic PTC' for short, below), relating to a new ceramic PTC making method, especially applied to ceramic PTC products stricter with the precision of resistance value. It is a ceramic PTC value regulating method, dipping a ceramic PTC in a manganese nitrate solution and making thermal processing at a temperature not less than 800 deg.C, necessarily. It increases the resistance values of PTC products and improves voltage-resistance of PTC products at the same time and has a very small influence on Rmax / R20deg.C.

Description

Technical field [0001] The invention relates to a method for adjusting the resistance value of a ceramic positive temperature coefficient thermistor (hereinafter referred to as "ceramic PTC"), which relates to a new manufacturing method of a ceramic positive temperature coefficient thermistor, and is especially suitable for relatively high precision requirements for the resistance value. Strict ceramic PTC products. Background technique [0002] The ceramic PTC powder is granulated, then press-molded, and then semiconducted during high-temperature sintering, so that it has a certain resistance value. However, due to the uneven temperature distribution in the furnace body and the uneven composition of the powder itself, and the actual temperature in the furnace body also fluctuates up and down in the same sintering procedure, and the daily ambient temperature changes will also have an impact, the resistance of the final product will vary. The distribution is not all within t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02
Inventor 沈十林钱朝勇张甦周欣山
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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