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Method for preparing linear positive temperature coefficient thermistor slurry

A technology of positive temperature coefficient and thermistor, applied in the direction of resistors with positive temperature coefficient, resistance manufacturing, resistors, etc., can solve the problems of low TCR, unable to meet the production needs of high resistance value, high TCR thermistor, etc.

Inactive Publication Date: 2015-03-25
CHINA ZHENHUA GRP YUNKE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Generally speaking, when the current PTC slurry has a large square resistance, the TCR is too low, which cannot meet the production needs of high resistance and high TCR thermistors.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0038] In an embodiment of the present invention, a preparation method of a linear positive temperature coefficient thermistor slurry comprises the following steps:

[0039] Step (1): Prepare a linear positive temperature coefficient functional phase ceramic, according to the molar ratio Ru 1 Cu 0.15 , add deionized water to the mixture of ruthenium dioxide and copper hydroxide, ball mill for 8 hours, the speed is 400 rpm, and the obtained ball milled material is dried at 80°C, crushed through an 80-mesh sieve, packed in a crucible, and the material Raise the temperature to 800°C and keep it warm for 4 hours. After natural cooling, the black ceramics obtained by the reaction are ball milled for 6 hours at a speed of 400 rpm to obtain ceramics for use;

[0040] Step (2): Prepare the glass phase, SiO 2 :Al 2 o 3 :B 2 o 3 :BaO:TiO 2 Mix the ingredients according to the mass ratio of 15:8:4:40:4, add deionized water to the mixed material, ball mill for 1 hour, and rotate at...

Embodiment 2

[0043] In an embodiment of the present invention, a preparation method of a linear positive temperature coefficient thermistor slurry comprises the following steps:

[0044] Step (1): Prepare linear positive temperature coefficient functional phase ceramics, according to the molar ratio Ru: Cu = 1: 1, add deionized water to the mixture of ruthenium dioxide and copper hydroxide, ball mill for 10 hours, and rotate at 451 rpm Minutes, the obtained ball-milled material was dried at 100°C, crushed through a 100-mesh sieve, and packed in a crucible. The material was heated to 950°C and kept for 6 hours. After natural cooling, the black ceramic obtained by the reaction was ball-milled for 8 hours at a speed of 451 rpm. / min, get the ceramic spare;

[0045] Step (2): Prepare the glass phase, SiO 2 :Al 2 o 3 :B 2 o 3 :BaO:TiO 2 Mix the ingredients according to the mass ratio of 20:10:5:60:5, add deionized water to the mixed material, ball mill for 2 hours, and rotate at 451 rpm, ...

Embodiment 3

[0048] In an embodiment of the present invention, a preparation method of a linear positive temperature coefficient thermistor slurry comprises the following steps:

[0049] Step (1): Prepare a linear positive temperature coefficient functional phase ceramic, according to the molar ratio Ru 1 Cu 1.5 , add deionized water to the mixture of ruthenium dioxide and copper hydroxide, ball mill for 12 hours, and rotate at a speed of 500 rpm, and dry the ball milled material at 120°C, then crush it through a 120-mesh sieve and put it in a crucible. Raise the temperature to 1100°C and keep it warm for 8 hours. After natural cooling, the black ceramics obtained by the reaction are ball milled for 10 hours at a speed of 500 rpm to obtain ceramics for use;

[0050] Step (2): Prepare the glass phase, SiO 2 :Al 2 o 3 :B 2 o 3 :BaO:TiO 2 Mix the ingredients according to the mass ratio of 25:12:6:80:6, add deionized water to the mixture, ball mill for 3 hours, and rotate at a speed of ...

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Abstract

The invention discloses a method for preparing linear positive temperature coefficient (PTC) thermistor slurry. The method comprises the following steps: 1. mixing copper hydroxide, ruthenium dioxide according to a certain mol ratio, performing ball milling, drying, crushing, sieving, sintering, crushing, and performing ball milling to obtain functional ceramic phase particles for later use; 2. mixing silica, alumina, boron trioxide, barium oxide and titanium dioxide according to a certain mass ratio, performing ball milling, drying, crushing, sintering, quenching, performing ball milling to obtain glass powder for later use; 3. mixing the resultants from the former two steps with copper oxide in a certain ratio and adding a certain amount of an organic carrier to roll into slurry. According to the invention, not only the linear PTC thick film slurry for screen printing can be developed, but also the slurry with high temperature coefficient of resistance (TCR) and high square resistance is obtained, wherein the TCR is more than 4000ppm / DEG C and the square resistance is more than 100 omega per square.

Description

technical field [0001] The invention belongs to the application field of linear positive temperature coefficient (PTC) thermistors, in particular to high temperature coefficient of resistance (TCR) and high square resistance (when the ratio of the effective length of the resistor body to the broadband is 1, it is called 1 square, namely The square number of the resistor body is 1; a paste with a thickness of 20 μm is printed on the resistor body of 1 square, and the resistance value tested after sintering is called square resistance) The preparation method of PTC resistor paste. Background technique [0002] With the development of digital technology and electronic products, since the 1970s, the development of surface mount technology SMT (Surface Mount Technology) has completely changed the through-hole insertion technology in traditional circuits, making electronic components lighter And miniaturization has also promoted the rapid development of temperature sensors. Tradit...

Claims

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Application Information

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IPC IPC(8): H01C7/02H01C17/00
Inventor 庞锦标郭明亚韩玉成
Owner CHINA ZHENHUA GRP YUNKE ELECTRONICS
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