CN108801493A - One kind being based on NTC thermo-sensitive materials, is used for pyrometric temperature sensor - Google Patents

One kind being based on NTC thermo-sensitive materials, is used for pyrometric temperature sensor Download PDF

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Publication number
CN108801493A
CN108801493A CN201810776018.9A CN201810776018A CN108801493A CN 108801493 A CN108801493 A CN 108801493A CN 201810776018 A CN201810776018 A CN 201810776018A CN 108801493 A CN108801493 A CN 108801493A
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conducting wire
powder
thermistor substrate
temperature sensor
sensitive materials
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邱炎新
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Shenzhen Ming Automatic Control Technology Co Ltd
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Shenzhen Ming Automatic Control Technology Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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  • Thermistors And Varistors (AREA)

Abstract

This application involves one kind based on NTC thermo-sensitive materials, is used for pyrometric temperature sensor, the temperature sensor includes thermistor substrate, the thermistor substrate is rectangle, conducting wire A and conducting wire B are respectively welded in the opposing sides of rectangle thermistor substrate, i.e., conducting wire A is welded on the first surface of thermistor substrate, conducting wire B is welded on the second surface of thermistor substrate, to realize that conducting wire A and conducting wire B clamp the thermistor substrate, encapsulated layer is externally provided in thermistor substrate and conducting wire A, conducting wire B；The thermistor substrate is a kind of nucleocapsid, NTC thermal sensitive ceramic materials based on Fe-Ca-Ce-Ti-W-O；Specifically, nuclear structure is CaWO4‑0.3Fe2(WO4)3‑0.2CeTi2O6, shell structure SiO2。

Description

One kind being based on NTC thermo-sensitive materials, is used for pyrometric temperature sensor
Technical field
This application involves temperature sensor technology fields, more particularly to one kind being based on NTC thermo-sensitive materials, being used for high temperature measurement Temperature sensor.
Background technology
Temperature sensor is the core component in temperature measuring instrument, can experience the temperature of measured medium and by its It is converted into available output signal, to realize that temperature measures.In field of temperature measurement, thermo-sensitive material is in temperature sensor Core, extremely sensitive to temperature change, the more thermo-sensitive material of application includes PTC thermo-sensitive materials and NTC thermo-sensitive materials at present.
NTC thermo-sensitive materials are a kind of sensitive materials of negative temperature coefficient, with quick response, at low cost, small, clever The advantages that sensitivity is high, however, current NTC thermo-sensitive materials are not suitable for high temperature measurement.
Invention content
The present invention is intended to provide a kind of being based on NTC thermo-sensitive materials, being used for pyrometric temperature sensor, it is above-mentioned to solve It is proposed problem.
One kind is provided in the embodiment of the present invention to be based on NTC thermo-sensitive materials, be used for pyrometric temperature sensor, it should Temperature sensor includes thermistor substrate, which is rectangle, in the opposing sides of rectangle thermistor substrate On be respectively welded conducting wire A and conducting wire B, that is, conducting wire A is welded on the first surface of thermistor substrate, and conducting wire B is welded on heat On the second surface of quick resistance substrate, to realize that conducting wire A and conducting wire B clamp the thermistor substrate, in thermistor base Piece and conducting wire A, conducting wire B are externally provided with encapsulated layer；The thermistor substrate be a kind of nucleocapsid, be based on Fe-Ca-Ce-Ti- The NTC thermal sensitive ceramic materials of W-O；Specifically, nuclear structure is CaWO4-0.3Fe2(WO4)3-0.2CeTi2O6, shell structure SiO2。
The technical solution that the embodiment of the present invention provides can include the following benefits：
1. the temperature sensor of the present invention has simple in structure, easy to use, good airproof performance, insulation performance height, anti-weather The advantages that performance is strong, reliability is high, at low cost, the reaction time is fast, and response is rapid, and stability is good；
2. the thermistor substrate uses the Fe-Ca-Ce-Ti-W-O systems NTC thermal sensitive ceramic materials of nucleocapsid, shell structure Specially SiO2, with higher electrical conductivity and resistivity-temperature characteristics, can be combined and be played a role with internal nuclear structure, be improved The resistivity-temperature characteristics of thermistor substrate at high temperature, have obtained unexpected technique effect.
The additional aspect of the application and advantage will be set forth in part in the description, and will partly become from the following description It obtains obviously, or recognized by the practice of the application.It should be understood that above general description and following detailed description are only It is exemplary and explanatory, the application can not be limited.
Description of the drawings
Using attached drawing, the invention will be further described, but the embodiment in attached drawing does not constitute any limit to the present invention System, for those of ordinary skill in the art, without creative efforts, can also obtain according to the following drawings Other attached drawings.
Fig. 1 is the structural schematic diagram of temperature sensor described in embodiment of the present invention；
Fig. 2 is the structure sectional view of temperature sensor of the present invention.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended The example of the consistent device and method of some aspects being described in detail in claims, of the invention.
Embodiments herein is related to one kind and being based on NTC thermo-sensitive materials, be used for pyrometric temperature sensor, in conjunction with figure 1, Fig. 2, the temperature sensor include thermistor substrate 10, which is rectangle, in rectangle thermistor base Conducting wire A20 and conducting wire B30 are respectively welded in the opposing sides of piece 10, that is, conducting wire A20 is welded on the of thermistor substrate 10 On one surface 101, conducting wire B30 is welded on the second surface 102 of thermistor substrate 10, to realize conducting wire A20 and conducting wire B30 clamps the thermistor substrate 10, and encapsulated layer 40 is externally provided in thermistor substrate 10 and conducting wire A20, conducting wire B30, should Encapsulated layer 40 is glass glaze encapsulated layer, and main component is magnesia；Conducting wire A20 and conducting wire B30 select Dumet wire conducting wire.
In the application, in terms of encapsulation, traditional epoxy resin is substituted with glass glaze, traditional copper is substituted with Dumet silk thread Silk, carries out sealed knot at high temperature.Due to Dumet wire and glass-glazed leakproofness, the temperature sensor made using the present invention is through boiling After boiling 1000 hours, electrical property is unchanged.It has great practical value.
Wherein, the package length of above-mentioned encapsulated layer 40 is determined according to temperature sensor needs.
In the application, in terms of welding, conducting wire A and conducting wire B are by ultrasonic welding, gold ball bonding and silver paste slugging A kind of realize.
Preferably, which can be 2000~5000 μm；The diameter of conducting wire A and conducting wire B can be 100~ 500μm。
In the application, at the aspect of thermistor substrate 10, the thermistor substrate 10 be a kind of nucleocapsid, be based on The NTC thermal sensitive ceramic materials of Fe-Ca-Ce-Ti-W-O；Specifically, nuclear structure is CaWO4-0.3Fe2(WO4)3-0.2CeTi2O6, Shell structure is SiO2。
In the prior art, the demand sensor that can be worked under the high temperature conditions is increased, however, traditional spinelle shape NTC thermistor material due on A and the positions B under high temperature transition-metal ions can reset, high temperature ageing characteristic is serious, unsuitable 300 degree or more of temperature measures；In technical scheme, the creative Fe-Ca-Ce-Ti-W-O systems using nucleocapsid NTC thermal sensitive ceramic materials, shell structure are specially SiO2, can be combined and be played a role with internal nuclear structure, improve temperature-sensitive The resistivity-temperature characteristics of resistance substrate at high temperature, have obtained unexpected technique effect.In addition, by using nucleocapsid temperature-sensitive Ceramic material effectively reduces the thickness of thermistor substrate so that temperature sensor has ultra-thin effect, expands using model It encloses.
About shell structure SiO2, the SiO2It is prepared using hydro-thermal method.With SiO2Coat nuclear structure CaWO4-0.3Fe2(WO4)3- 0.2CeTi2O6, the NTC effects of material can be significantly improved, unexpected technique effect is achieved.
About nuclear structure, the CaWO4-0.3Fe2(WO4)3-0.2CeTi2O6It is by CaCO3、CeO2、TiO2、WO3、Fe2O3Powder End through ball milling mixing, pre-burning, again formed after ball milling, preferred 2-5 μm of grain size.
In the application, in terms of thermistor substrate, creative ceramic based on Fe-Ca-Ce-Ti-W-O systems of the nuclear structure Material improves the NTC effects of material, achieves unexpected technique effect by doping.
In a preferred embodiment, the thickness of the thermistor substrate 10 be 100~200 μm, length can be 450~ 500 μm, width can be 300~350 μm.Due to using above-mentioned thermal sensitive ceramic material, the thermistor substrate thickness to compare tradition Substrate greatly reduces, and plays ultra-thin technique effect.
It the following is the preparation process of herein described thermistor substrate：
It is prepared by step 1, powder
(a) CaCO is weighed according to stoichiometric ratio3、CeO2、TiO2、WO3、Fe2O3Powder, wherein what the above process was used Primary raw material such as the following table 1
The primary raw material that table 1 uses
Raw material Purity grade Manufacturer
CaCO3 It analyzes pure (99.0%) Shanghai traditional Chinese medicines reagent
CeO2 It analyzes pure (99.0%) Shanghai traditional Chinese medicines reagent
TiO2 It analyzes pure (99.5%) Shanghai traditional Chinese medicines reagent
WO3 It analyzes pure (99.0%) Shanghai traditional Chinese medicines reagent
Fe2O3 It analyzes pure (99.0%) Shanghai traditional Chinese medicines reagent
Then, it is that powder is uniformly mixed and makes powder refining with wet ball-milling, the mass ratio for controlling powder and zirconium ball is 1: 3, the mass ratio with deionized water is 1:2, Ball-milling Time 10h, rotating speed are 350 revs/min, slurry obtained by ball milling are put into dry In dry case, 10h is dried at 90 DEG C, the powder after drying is in 1158 DEG C of pre-burning 3h；Then second of ball milling and drying are carried out again, side Method is identical as first time；After second of ball milling, screening grain size is 2-5 μm, obtains powder E；
(b) above-mentioned powder E is added in ethanol solution, is stirred by ultrasonic, suitable H is then added2O is added suitable The ethyl orthosilicate absolute ethyl alcohol mixed liquor of amount is finally slowly added dropwise ammonium hydroxide and adjusts pH, and ultrasonic disperse stirs again, is added a small amount of Citric acid modification surface is filtered, and washing is dried to obtain nucleocapsid SiO2/ powder E；
Step 2 prepares thermistor substrate
(a) by the above-mentioned SiO prepared2The PVA that 6wt.% is incorporated as in/powder E makees binder, under 180Mpa pressure It suppresses rectangular；
(b) it is sintered, sintering process is：580 DEG C are warming up to the rate of 2 DEG C/min, 1h is kept the temperature at 580 DEG C, with 3 DEG C/min Rate be warming up to 670 DEG C, at 670 DEG C keep the temperature 3h, be warming up to 1310 DEG C with the rate of 4 DEG C/min, at 1310 DEG C keep the temperature 6h, so Postcooling obtains the thermistor substrate to room temperature.
Further explanation is made to the present invention with reference to embodiment.
Embodiment
One kind being based on NTC thermo-sensitive materials, is used for pyrometric thermistor substrate, and the thickness of the thermistor substrate is 100~200 μm, length can be 450~500 μm, and width can be 300~350 μm.The thermistor substrate is a kind of nucleocapsid , NTC thermal sensitive ceramic materials based on Fe-Ca-Ce-Ti-W-O；Specifically, nuclear structure is CaWO4-0.3Fe2(WO4)3- 0.2CeTi2O6, shell structure SiO2。
About shell structure SiO2, the SiO2It is prepared using hydro-thermal method.
About nuclear structure, the CaWO4-0.3Fe2(WO4)3-0.2CeTi2O6It is by CaCO3、CeO2、TiO2、WO3、Fe2O3Powder End through ball milling mixing, pre-burning, again formed after ball milling, preferred 2-5 μm of grain size.
It the following is the preparation process of herein described thermistor substrate：
It is prepared by step 1, powder
(a) CaCO is weighed according to stoichiometric ratio3、CeO2、TiO2、WO3、Fe2O3Powder, wherein what the above process was used Primary raw material such as the following table 1
The primary raw material that table 1 uses
Raw material Purity grade Manufacturer
CaCO3 It analyzes pure (99.0%) Shanghai traditional Chinese medicines reagent
CeO2 It analyzes pure (99.0%) Shanghai traditional Chinese medicines reagent
TiO2 It analyzes pure (99.5%) Shanghai traditional Chinese medicines reagent
WO3 It analyzes pure (99.0%) Shanghai traditional Chinese medicines reagent
Fe2O3 It analyzes pure (99.0%) Shanghai traditional Chinese medicines reagent
Then, it is that powder is uniformly mixed and makes powder refining with wet ball-milling, the mass ratio for controlling powder and zirconium ball is 1: 3, the mass ratio with deionized water is 1:2, Ball-milling Time 10h, rotating speed are 350 revs/min, slurry obtained by ball milling are put into dry In dry case, 10h is dried at 90 DEG C, the powder after drying is in 1158 DEG C of pre-burning 3h；Then second of ball milling and drying are carried out again, side Method is identical as first time；After second of ball milling, screening grain size is 2-5 μm, obtains powder E；
(b) above-mentioned powder E is added in ethanol solution, is stirred by ultrasonic, suitable H is then added2O is added suitable The ethyl orthosilicate absolute ethyl alcohol mixed liquor of amount is finally slowly added dropwise ammonium hydroxide and adjusts pH, and ultrasonic disperse stirs again, is added a small amount of Citric acid modification surface is filtered, and washing is dried to obtain nucleocapsid SiO2/ powder E；
Step 2 prepares thermistor substrate
(a) by the above-mentioned SiO prepared2The PVA that 6wt.% is incorporated as in/powder E makees binder, under 180Mpa pressure It suppresses rectangular；
(b) it is sintered, sintering process is：580 DEG C are warming up to the rate of 2 DEG C/min, 1h is kept the temperature at 580 DEG C, with 3 DEG C/min Rate be warming up to 670 DEG C, at 670 DEG C keep the temperature 3h, be warming up to 1310 DEG C with the rate of 4 DEG C/min, at 1310 DEG C keep the temperature 6h, so Postcooling obtains the thermistor substrate to room temperature.
After measured, the thermistor substrate that the application obtains is 2.66 × 10 in 25 DEG C of resistivity7Ω m, 800 DEG C Resistivity is 149 Ω m；There is preferable NTC performances at high temperature；
High-temperature stability：The variation for the resistivity that thermistor substrate is kept the temperature at 500 DEG C before and after aging 200h is tested, is sent out Now it is by 3.87 × 106Ω m change to 3.98 × 106Ω m, change rate 2.8%, high-temperature stability is preferable.
The foregoing is merely the preferred modes of the present invention, are not intended to limit the invention, all spirit and original in the present invention Within then, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.

Claims (7)

1. one kind being based on NTC thermo-sensitive materials, is used for pyrometric temperature sensor, which includes thermistor base Piece, the thermistor substrate are rectangle, and conducting wire A and conducting wire B are respectively welded in the opposing sides of rectangle thermistor substrate, That is, conducting wire A is welded on the first surface of thermistor substrate, conducting wire B is welded on the second surface of thermistor substrate, from And realize that conducting wire A and conducting wire B clamp the thermistor substrate, it is externally provided with encapsulation in thermistor substrate and conducting wire A, conducting wire B Layer；It is characterized in that, the thermistor substrate is a kind of nucleocapsid, NTC temperature-sensitives based on Fe-Ca-Ce-Ti-W-O pottery Ceramic material；Specifically, nuclear structure is CaWO4-0.3Fe2(WO4)3-0.2CeTi2O6, shell structure SiO2。
2. one kind according to claim 1 is based on NTC thermo-sensitive materials, is used for pyrometric temperature sensor, feature It is, the nuclear structure CaWO4-0.3Fe2(WO4)3-0.2CeTi2O6It is by CaCO3、CeO2、TiO2、WO3、Fe2O3Powder is through ball Mill mixing pre-burning, is formed after ball milling, preferred 2-5 μm of grain size again.
3. one kind according to claim 1 is based on NTC thermo-sensitive materials, is used for pyrometric temperature sensor, feature It is, the encapsulation layer thickness is 2000~5000 μm.
4. one kind according to claim 1 is based on NTC thermo-sensitive materials, is used for pyrometric temperature sensor, feature It is, a diameter of 100~500 μm of the conducting wire A and conducting wire B.
5. one kind according to claim 1 is based on NTC thermo-sensitive materials, is used for pyrometric temperature sensor, feature It is, the conducting wire A and conducting wire B select Dumet wire conducting wire.
6. one kind according to claim 2 is based on NTC thermo-sensitive materials, is used for pyrometric temperature sensor, feature It is, the thickness of the thermistor substrate is 100~200 μm, and length can be 450~500 μm, and width can be 300~350 μ m。
7. one kind according to claim 6 is based on NTC thermo-sensitive materials, is used for pyrometric temperature sensor, feature It is, the preparation process of the thermistor substrate：
It is prepared by step 1, powder
(a) CaCO is weighed according to stoichiometric ratio3、CeO2、TiO2、WO3、Fe2O3Then powder is that powder is mixed with wet ball-milling Powder refining is closed uniformly and makes, the mass ratio for controlling powder and zirconium ball is 1:3, the mass ratio with deionized water is 1:2, when ball milling Between be 10h, rotating speed is 350 revs/min, and slurry obtained by ball milling is put into drying box, 10h, the powder after drying are dried at 90 DEG C Body is in 1158 DEG C of pre-burning 3h；Then second of ball milling and drying are carried out again, and method is identical as first time；After second of ball milling, sieve It is 2-5 μm to select grain size, obtains powder E；
(b) above-mentioned powder E is added in ethanol solution, is stirred by ultrasonic, suitable H is then added2O, addition are suitable just Silester absolute ethyl alcohol mixed liquor is finally slowly added dropwise ammonium hydroxide and adjusts pH, and ultrasonic disperse stirs again, and a small amount of citric acid is added Modification of surfaces filters, and washing is dried to obtain nucleocapsid SiO2/ powder E；
Step 2 prepares thermistor substrate
(a) by the above-mentioned SiO prepared2The PVA that 6wt.% is incorporated as in/powder E makees binder, is suppressed under 180Mpa pressure It is rectangular；
(b) it is sintered, sintering process is：580 DEG C are warming up to the rate of 2 DEG C/min, 1h is kept the temperature at 580 DEG C, with the speed of 3 DEG C/min Rate is warming up to 670 DEG C, and 3h is kept the temperature at 670 DEG C, 1310 DEG C are warming up to the rate of 4 DEG C/min, and 6h is kept the temperature at 1310 DEG C, then cold But to room temperature, the thermistor substrate is obtained.
CN201810776018.9A 2018-07-16 2018-07-16 One kind being based on NTC thermo-sensitive materials, is used for pyrometric temperature sensor Pending CN108801493A (en)

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CN105258820A (en) * 2015-11-05 2016-01-20 广东爱晟电子科技有限公司 Manufacturing method of silicone resin packaged temperature sensor, and temperature sensor
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CN105258820A (en) * 2015-11-05 2016-01-20 广东爱晟电子科技有限公司 Manufacturing method of silicone resin packaged temperature sensor, and temperature sensor
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Application publication date: 20181113