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Semiconductor ceramic composition for NTC thermistor

A ceramic composition and thermistor technology, applied in the direction of resistors, non-adjustable metal resistors, resistors with negative temperature coefficients, etc., can solve the problems of increasing the difficulty of device manufacturing, and achieve easy and consistent fine-tuning of resistance The effect of increasing and reducing costs

Inactive Publication Date: 2018-01-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Higher requirements are placed on the accuracy and consistency of high-precision resistance and high-precision thermal index, which will inevitably increase the difficulty of device manufacturing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: This method is a solid-phase method. First, as a ceramic raw material composition, weigh manganese oxide, iron oxide and nickel oxide according to a molar ratio of 3:1:1, and then set the manganese, iron and nickel elements as The sum of the molar amounts of tin oxide is 100, and the molar amount of tin oxide added is 10; the above-mentioned weighed materials are put into a ball mill, and they are fully ground for more than 2 hours with a grinding medium composed of agate to make ceramic powder. Next, a predetermined amount of organic binder and water are added to the above ceramic powder, mixed by a wet method to make a slurry, and then shaped by a doctor blade method to make a ceramic green sheet; or by screen printing , through mold injection molding to make ceramic sheet embryos, ceramic sheet embryos can be laminated and crimped. Next, use conductive paste mainly composed of silver or silver palladium to screen print on both sides of the above-mentioned ...

Embodiment 2

[0019] Example 2: This method is a solid-phase method. As a ceramic raw material composition, manganese oxide, iron oxide and nickel oxide are weighed according to a molar ratio of 3:1:1, and then set in terms of manganese, iron and nickel elements. The sum of the moles is 100, and in order to lower the sintering temperature, the molar amount of gallium oxide added is 6 in terms of gallium element. Put the above-mentioned weighed materials into a ball mill, and fully grind them with a pulverizing medium made of agate for more than 2 hours to make ceramic powder. Add a predetermined amount of organic binder and water to the above ceramic powder, mix it with a wet method to make a slurry, and then shape it with a doctor blade method to make a ceramic green sheet, or use screen printing. The mold is injection molded to make a ceramic sheet embryo, which can be laminated and crimped. Next, use silver or silver-palladium-based conductive paste to screen print on both sides of the ...

experiment example 3

[0020] Experimental Example 3, this method is a solid-phase method, as a ceramic raw material composition, weigh manganese oxide, cobalt oxide and nickel oxide according to the molar ratio of 3:2:1, and then set the amount of manganese, cobalt and nickel elements in it. The sum of the moles is 100, and tin oxide and gallium oxide are added, wherein the moles of the tin element are 8, the moles of the gallium element are 3, and the sum of the two is 11. Put the above-mentioned weighed materials into a ball mill, and fully grind them with a pulverizing medium made of agate for more than 2 hours to make ceramic powder. Add a specified amount of organic binder and water to the above-mentioned ceramic powder, mix it with a wet method to make a slurry, and then shape it by a doctor blade method to make a ceramic green sheet; or use a screen printing method, through The mold is injection molded to make a ceramic sheet embryo, which can be laminated and crimped. Next, use silver or s...

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PUM

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Abstract

The invention provides a semiconductor ceramic composition for an NTC thermistor. The semiconductor ceramic composition comprises oxides of at least two transition metals and an oxide of at least oneadded substance; when the added substance is tin, the molar ratio of the gross of the transition metals to the tin is 100:(0.01-25); when the added substance is gallium, the molar ratio of the transition metals to the tin is 100:(0.001-15); and when the added substance is the tin and the gallium, the molar ratio of the transition metals to the added substance is 100:(0.011-25), wherein the ratio of the tin is not smaller than 0.01 and the ratio of the gallium is not smaller than 0.001. According to the semiconductor ceramic composition, a resistance value and a thermosensitive index B of the resistor can be regulated and the temperature of sintering and molding the ceramic composition to prepare the NTC resistor is reduced, so that the resistance value consistency of the prepared NTC resistor is further improved.

Description

technical field [0001] The invention relates to a multi-component semiconductor ceramic composition material system for negative temperature coefficient semiconductor (NTC) resistors. Background technique [0002] NTC semiconductor ceramics based on transition metal oxides such as Mn, Co, Ni, Cu and Fe that appeared in the 1940s (Chang Aimin, Tao Mingde, Han Ying. Synthesis and sintering characteristics of CoMnNiO ultrafine powder[J] .Functional Materials, 1995, 26(6):545-548.) (Wang Enxin, Jing Yulan, Wang Pengcheng, Song Yan. The current situation and development trend of NTC thermistors [J]. Electronic Components and Materials, 1997, 16( 4): 1-8.) are widely used in temperature measurement and sensing, integrated circuit current protection and many other fields. Power type NTC thermistors are mostly used for power supply surge suppression. NTC thermistors for suppressing surges are often used in electronic circuits with capacitors, heaters and motor starts. The surge cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/04H01C7/00
Inventor 苏力宏万彩霞刘金波
Owner NORTHWESTERN POLYTECHNICAL UNIV