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Method for preparing linear thermistor slurry with negative temperature coefficient

A technology of negative temperature coefficient and thermistor, applied in the direction of resistors with negative temperature coefficient, can solve the problems of limited application of paste, large square resistance, high cost, and achieve the effect of huge economic benefits

Inactive Publication Date: 2015-02-25
CHINA ZHENHUA GRP YUNKE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of NTC slurry by the above methods requires the use of precious metal materials, which makes the cost of linear NTC slurry higher. At the same time, there are generally problems of narrow TCR range or large square resistance, which limits the practical application of the slurry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: prepare TCR value about-2800ppm / ℃, the thick-film linear NTC resistance slurry of square resistance about 15Ω / μm, the mass ratio of used material is as following table (total mass is 100 parts), wherein lead acid barium and bismuth Barium oxide is prepared according to the above steps ① and ②, and may contain other forms of substances, such as PbO, Bi 2 o 3 etc., the organic vehicle is pre-mixed and meets the requirements of thick film process:

[0011] Barium lead acid

[0012] According to the above formula, the barium plumbate and barium bismuthate are fully mixed first, and the organic vehicle is added to the obtained mixture, which is rolled and mixed evenly on a three-roll mill, and the finished product of linear NTC slurry is obtained after testing the specifications of the slurry to be qualified.

Embodiment 2

[0013] Embodiment 2: prepare TCR value about-6800ppm / ℃, square resistance about 2.5KΩ / thick-film linear NTC resistor slurry, the mass ratio of materials used is as follows (total mass is 100 parts), wherein barium lead acid and Barium bismuthate is prepared according to the above steps ① and ②, and may contain other forms of substances, such as PbO, Bi 2 o 3 etc., the organic vehicle is pre-mixed and meets the requirements of thick film process:

[0014] Barium lead acid

[0015] According to the above formula, the barium plumbate and barium bismuthate are fully mixed first, and the organic vehicle is added to the obtained mixture, which is rolled and mixed evenly on a three-roll mill, and the finished product of linear NTC slurry is obtained after testing the specifications of the slurry to be qualified.

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Abstract

The invention discloses a method for preparing linear thermistor slurry with negative temperature coefficient, which comprises the following steps: 1) burdening barium carbonate and lead tetraoxide according to mole ratio of 1: 0.34-0.4, performing high-speed ball-milling mixing, drying and sieving, insulating for 8-12 hours at 750-850 DEG C to obtain a reactant, performing ball milling on the reactant for standby; 2) burdening barium carbonate and bismuth trioxide according to mol ratio of 1: 0.5-0.53, then performing high-speed ball-milling mixing, drying and sieving, insulating for 8-12 hours at 700-850 DEG C to obtain a reactant, performing ball milling on the reactant for standby; and 3)uniformly mixing the material obtained in the last two steps according to mass ratio of 1: 0.05-0.8, and then adding a certain amount of organic carrier for rolling to obtain a slurry. According to the invention, the linear NTC thick membrane slurry used for screen printing can be developed, and a slurry formula with high resistance temperature coefficient (TCR) and low sheet resistance can be obtained, TCR can reach -1000--7000ppm / DEG C, the sheet resistance scope is 5 omega / squre-4K omega / square, and the a technical scheme provided by the invention has good expansibility.

Description

technical field [0001] The invention belongs to the application field of linear negative temperature coefficient (NTC) thermistors, in particular to a preparation method of low square resistance and high temperature coefficient of resistance (TCR) NTC resistance slurry. Background technique [0002] NTC thermistor material refers to the material whose resistivity decreases with the increase of temperature [1] PARK K. Structural and electrical properties of FeMg 0.7 Cr 0.6 co 0.7-x al x o 4 (0≤x≤0.3) thick film NTC thermistors IJ.J Eur Ceram Soc, 2006, 26(6): 909-914. 【2】BASU A.BRINKMAN A W, HASHIMI T NTC characteristics of bismuth based ceramic at high temperature, J Int J lnorg Mater, 2001, 3: 1219-1221. Among them, thermistors are divided into linear and nonlinear NTC. The resistance of nonlinear NTC decreases exponentially with the decrease of temperature. It is used for temperature measurement, temperature control Temperature compensation is very inconvenient, but t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/453C04B35/626H01C7/04
Inventor 庞锦标张洪英郭明亚韩玉成
Owner CHINA ZHENHUA GRP YUNKE ELECTRONICS
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