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Preparation method of high-TCR low square resistance linear NTC resistance paste

A technology of resistive paste and low square resistance, applied in the direction of resistors with negative temperature coefficient, etc., can solve the problems of linear NTC paste and large-scale production and application of paste, high precious metal content, difficult linear sensitive ceramics, etc. , to achieve the effect of reducing the amount added, huge economic benefits, resistance and temperature linearity

Active Publication Date: 2016-02-10
CHINA ZHENHUA GRP YUNKE ELECTRONICS
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the existing preparation of linear NTC slurry technology, starting from the basic raw material system, provide a kind of preparation method of high TCR low square resistance linear NTC resistance slurry, to solve the linear NTC slurry in the above-mentioned background technology The content of precious metals in the material is high, and linear sensitive ceramics are difficult to make into linear NTC slurry and the large-scale production and application of slurry is limited.

Method used

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preparation example Construction

[0025] A preparation method of high TCR and low square resistance linear NTC resistance slurry, comprising the following steps:

[0026] (1) To determine the manganese, nickel and copper nonlinear NTC material system, first mix the manganese, nickel and copper compounds according to the molar component ratio: manganese nitrate 1.0-1.65, nickel nitrate 0.65-1.0, copper nitrate 0.7-1.0; Add deionized water to the prepared mixture of manganese, nickel and copper compounds to obtain an aqueous solution containing manganese, nickel and copper ions before the reaction, which is the initial reaction solution;

[0027] (2) the initial reaction solution obtained is stirred, and the stirring temperature is 30~60 ℃, and the stirring speed is 200rpm, and in the stirring process, potassium carbonate solution is added dropwise in the initial reaction solution to generate manganese, nickel, copper Carbonate precipitation; wash the precipitate repeatedly with deionized water until its pH valu...

Embodiment 1

[0030] According to the molar formula Mn: 1.3, Ni: 0.9, Cu: 0.8 as the basic formula of nonlinear NTC, the nonlinear NTC ceramic precursor was prepared according to steps (1) and (2), and the prepared TCR value was -4000ppm / ℃, and the square resistance It is a thick film linear NTC resistor paste of 75Ω / μm. The mass ratio of the materials used is as follows (the quality of the nonlinear NTC powder is set as 100 parts), wherein the organic carrier is pre-prepared to meet the thick film process requirements, and the glass powder is Refined in advance, the softening temperature is 600-800°C, and the expansion coefficient is 2-6×10 -6 / K, the average particle size is less than 5μm:

[0031] Nonlinear NTC powder

[0032]According to the above formula, the non-linear NTC powder, ruthenium dioxide and glass powder are fully mixed first, and deionized water is added for high-speed ball milling at a speed of 387rpm. Rolling and mixing are uniform, and the finished product of...

Embodiment 2

[0034] According to the molar formula Mn: 1.1, Ni: 0.95, Cu: 0.95 as the basic formula of nonlinear NTC, the nonlinear NTC ceramic precursor was prepared according to steps (1) and (2), and the prepared TCR value was -1600ppm / ℃, the square resistance It is a thick film linear NTC resistor paste of 10Ω / μm. The mass ratio of the materials used is as follows (the quality of the nonlinear NTC powder is set as 100 parts), wherein the organic carrier is pre-prepared to meet the thick film process requirements, and the glass powder is Refined in advance, the softening temperature is 600-800°C, and the expansion coefficient is 2-6×10 -6 / K, the average particle size is less than 5μm:

[0035] Nonlinear NTC powder

100

Ruthenium dioxide

40

glass powder

9

organic carrier

28

[0036] According to the above formula, the non-linear NTC powder, ruthenium dioxide and glass powder are fully mixed first, and deionized water is added for high...

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Abstract

The invention discloses a preparation method of a high-TCR low square resistance linear NTC resistance paste. According to the method, nonlinear manganese, nickel and copper NTC ceramic reaction precursors are taken as main body function materials of the linear NTC paste, and the addition amount of precious metals can be effectively reduced by preparing a nonlinear NTC material with suitable B values (material constants) and specific resistance; and moreover, the value of resistance and the influence of temperature on the value of resistance are reduced by using an appropriate amount of nonlinear NTC powder to be mixed with ruthenium powder or ruthenium oxide powder, the linear relation between the value of resistance and the temperature is achieved, and the method is extremely stable in application. The method accords with the miniaturization and lamination development direction of current electronic components, key electronic pastes are independently researched and developed and are produced in large scale, the development of domestic electronic components can be quickened, and the cost of components and parts such as thermistors can be greatly reduced by preparing the low-cost and high-performance linear NTC paste, so that great economic benefits can be brought.

Description

technical field [0001] The invention relates to the application field of a linear negative temperature coefficient (NTC) thermistor, in particular to a preparation method of a high TCR and low square resistance linear NTC resistance slurry. Background technique [0002] NTC thermistor material refers to a class of materials whose resistivity decreases with the increase of temperature [1] PARKK.StructuralandelectricalpropertiesofFeMg 0.7 Cr 0.6 co 0.7-x al x o 4 (0≤x≤0.3) thickfilmNTCthermistorsIJ.JEurCeramSoc, 2006, 26(6): 909-914. [2] BASUA.BRINKMANAW, HASHIMITNTCcharacteristicsofbismuthbasedceramicathightemperature, JIntJlnorgMater, 2001, 3: 1219-1221., wherein NTC thermistors are divided into There are two types of linear and nonlinear NTC. The resistance of nonlinear NTC decreases exponentially with the decrease of temperature, which is inconvenient for temperature measurement, temperature control and temperature compensation, while the relationship between linear NT...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/04
Inventor 庞锦标郭明亚李程峰韩玉成朱威禹黄伟训金矛
Owner CHINA ZHENHUA GRP YUNKE ELECTRONICS
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