CN1945761A - High reliability NTC thermosensitive resistor and its preparing method - Google Patents
High reliability NTC thermosensitive resistor and its preparing method Download PDFInfo
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- CN1945761A CN1945761A CN 200610122800 CN200610122800A CN1945761A CN 1945761 A CN1945761 A CN 1945761A CN 200610122800 CN200610122800 CN 200610122800 CN 200610122800 A CN200610122800 A CN 200610122800A CN 1945761 A CN1945761 A CN 1945761A
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Abstract
This invention discloses a high reliable NTC thermistor and its preparation method, in which, the thermistor is composed of a chip, a glass shell covering the surrounding of the chip and a lead, both sides of the chip are coated with metal electrodes, one end of the lead is fixed on the metal electrode characterizing that the main composition of the chip material is: CoNO3 hexahydrate 20-24%, 50% MnNO3 solution 20-24%, NiNO3 14-18%, ammonium bicarbonate 26-30% and ammonia 10-12%.
Description
Technical field
The present invention relates to analytically pure metal nitrate is the electronic devices and components and the manufacture method thereof of primary raw material, specifically is a kind of high reliability NTC thermosensitive resistor and preparation method thereof.
Background technology
NTC is the abbreviation of Negative Temperature Coefficient, and the meaning is the temperature coefficient of bearing, very big semi-conducting material or the components and parts of general reference negative temperature coefficient, and so-called NTC themistor is exactly a negative temperature coefficient thermistor.NTC themistor be a kind of be the semiconductive ceramic element that main material is made with the high-purity transition metal oxide, it is to be main material with metal oxides such as manganese, cobalt, nickel and copper, adopts the ceramic process manufacturing to form.These metal oxide materials all have semiconductor property because on electrically conducting manner semi-conducting materials such as all fours germanium, silicon.When temperature was hanged down, the charge carrier of these oxide materials (electronics and hole) number was few, so its resistance value is higher; Along with the rising of temperature, the charge carrier number increases, so resistance value reduces.Therefore it has the characteristic of resistance value respective change with variation of temperature, promptly measures under the power characteristic that resistance value descends with the rising of temperature certain.NTC themistor excursion at room temperature is at 100～1000000 ohm, temperature coefficient-2%～-6.5%.Utilize this characteristic, NTC themistor can be widely used in occasions such as temperature survey, temperature-compensating, inhibition surge current.
But present domestic like product resistance year drift rate 〉=1%.Requiring than higher field (as Medical Devices) at some temperature-controlled precision is to meet the demands far from.At specialized market, we have developed resistance year drift rate less than 0.1% high reliability NTC thermosensitive resistor for a bit.
Summary of the invention
The present invention proposes a kind of high reliability NTC thermosensitive resistor and preparation method thereof, has improved reliability of products.
For achieving the above object, the technical solution adopted in the present invention is as follows: a kind of high reliability NTC thermosensitive resistor, it mainly is made up of chip, the glass bulb and the lead-in wire that cover around the chip, the coated on both sides of chip has metal electrode, one end of lead-in wire is fixed on the metal electrode, it is characterized in that the main component of described chip material consists of:
Cabaltous nitrate hexahydrate 20%～24%;
Manganese nitrate solution 20%～24%;
Nickel nitrate 14%～18%;
Carbonic hydroammonium 26%～30%;
Ammoniacal liquor 10%～12%.
The metal electrode of the coated on both sides of described chip is a silver electrode.
The manganese nitrate solution concentration of using in the described chip composition is 50%, and described ammonia concn is 25%～28%.
A kind of preparation method of high reliability NTC thermosensitive resistor, preparation method's step is as follows:
A. respectively several raw material are mixed with the aqueous solution, are heated to 45 ℃ and mix stirring, allow it fully react, again with the continuous rinsing of deionized water, until removing unnecessary OH
-Ion;
B. with reaction product under 100 ℃ of conditions the oven dry after, place Muffle furnace to carry out 850 ℃ calcining;
C. be pressed into the cylinder of definite shape with isostatic pressing machine, in 1240 ℃ high temperature furnace, sinter fine and close ceramic body into;
D. cut into the thin slice of 0.25mm with the high accuracy slicing machine,, be divided into 0.5 * 0.5 little chip with the high accuracy scribing machine again in its coated on both sides silver electrode;
E. chip is packed in the glass bulb, good and sound again lead-in wire is packaged into thermistor with the glass banking through 600 ℃.
The present invention through for many years the experiment, find out best proportioning,, improved reliability, its 25 ℃ resistance value year drift rate less than 0.1%.
Embodiment
The invention will be further described below in conjunction with embodiment.
Be the glass sealed diode NTC themistor that a model is HX-MF58GT202F350F below, the raw material of its chip material consist of:
Cabaltous nitrate hexahydrate 206 grams;
50% manganese nitrate solution, 205 grams;
Ferric nitrate 153 grams;
Carbonic hydroammonium 263 grams;
105 milliliters of 26.5% ammoniacal liquor.
Its preparation method is:
The first step: respectively several raw material are mixed with the aqueous solution, are heated to 45 ℃ and mix stirring, allow it fully react, again with the continuous rinsing of deionized water, until removing unnecessary OH
-Ion.
Second step: after oven dry under 100 ℃ of conditions, place Muffle furnace to carry out 850 ℃ calcining reaction product.
The 3rd step: be pressed into the cylinder of definite shape with isostatic pressing machine, in 1240 ℃ high temperature furnace, sinter fine and close ceramic body into.
The 4th step: cut into the thin slice of 0.25mm with the high accuracy slicing machine,, be divided into 0.5 * 0.5 little chip with the high accuracy scribing machine again in its coated on both sides silver electrode.
The 5th step: chip is packed in the glass bulb, and good and sound again lead-in wire is packaged into thermistor with the glass banking through 600 ℃.
The characteristics of this thermistor are:
1, glass packaging, firm in structure, good heat resistance, reliability height, working stability;
2, little, the light weight of volume is applicable to the automatism card machine installation;
3, the cost performance height is economical and practical.
The scope of application of this thermistor is:
1. control of the temperature of medical treatment, environmental protection, meteorology, food processing equipment and check;
2. liquid level indication and flow measurement.
Claims (4)
1, a kind of high reliability NTC thermosensitive resistor, it mainly is made up of chip, the glass bulb and the lead-in wire that cover around the chip, the coated on both sides of chip has metal electrode, and an end of lead-in wire is fixed on the metal electrode, it is characterized in that the main component of described chip material consists of:
Cabaltous nitrate hexahydrate 20%～24%;
Manganese nitrate solution 20%～24%;
Nickel nitrate 14%～18%;
Carbonic hydroammonium 26%～30%;
Ammoniacal liquor 10%～12%.
2, NTC themistor according to claim 1, the metal electrode that it is characterized in that the coated on both sides of described chip is a silver electrode.
3, NTC themistor according to claim 1 and 2 is characterized in that the manganese nitrate solution concentration of using in the described chip composition is 50%, and described ammonia concn is 25%～28%.
4, a kind of preparation method of high reliability NTC thermosensitive resistor is characterized in that this preparation method's step is as follows:
A. respectively several raw material are mixed with the aqueous solution, are heated to 45 ℃ and mix stirring, allow it fully react, again with the continuous rinsing of deionized water, until removing unnecessary OH
-Ion;
B. with reaction product under 100 ℃ of conditions the oven dry after, place Muffle furnace to carry out 850 ℃ calcining;
C. be pressed into the cylinder of definite shape with isostatic pressing machine, in 1240 ℃ high temperature furnace, sinter fine and close ceramic body into;
D. cut into the thin slice of 0.25mm with the high accuracy slicing machine,, be divided into 0.5 * 0.5 little chip with the high accuracy scribing machine again in its coated on both sides silver electrode;
E. chip is packed in the glass bulb, good and sound again lead-in wire is packaged into thermistor with the glass banking through 600 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610122800 CN1945761A (en) | 2006-10-18 | 2006-10-18 | High reliability NTC thermosensitive resistor and its preparing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610122800 CN1945761A (en) | 2006-10-18 | 2006-10-18 | High reliability NTC thermosensitive resistor and its preparing method |
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| Publication Number | Publication Date |
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| CN1945761A true CN1945761A (en) | 2007-04-11 |
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| CN 200610122800 Pending CN1945761A (en) | 2006-10-18 | 2006-10-18 | High reliability NTC thermosensitive resistor and its preparing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107346690A (en) * | 2017-09-08 | 2017-11-14 | 开特电子云梦有限公司 | A kind of high reliability negative temperature coefficient thermistor and preparation method thereof |
-
2006
- 2006-10-18 CN CN 200610122800 patent/CN1945761A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107346690A (en) * | 2017-09-08 | 2017-11-14 | 开特电子云梦有限公司 | A kind of high reliability negative temperature coefficient thermistor and preparation method thereof |
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Open date: 20070411 |