CN115101274A - Functional material composition of linear temperature sensor and preparation method thereof - Google Patents
Functional material composition of linear temperature sensor and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 91
- 239000000203 mixture Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 8
- 239000012071 phase Substances 0.000 claims description 19
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 16
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 3
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 238000003746 solid phase reaction Methods 0.000 claims description 3
- 229910052596 spinel Inorganic materials 0.000 claims description 3
- 239000011029 spinel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910052582 BN Inorganic materials 0.000 claims description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 2
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 150000004767 nitrides Chemical class 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000010791 quenching Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 238000001238 wet grinding Methods 0.000 claims description 2
- 239000011162 core material Substances 0.000 abstract description 4
- 230000004044 response Effects 0.000 abstract description 4
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
- H01C7/042—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient mainly consisting of inorganic non-metallic substances
- H01C7/048—Carbon or carbides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
- H01C17/06—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
- H01C7/042—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient mainly consisting of inorganic non-metallic substances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
- H01C7/042—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient mainly consisting of inorganic non-metallic substances
- H01C7/043—Oxides or oxidic compounds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
- H01C7/042—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient mainly consisting of inorganic non-metallic substances
- H01C7/043—Oxides or oxidic compounds
- H01C7/046—Iron oxides or ferrites
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Abstract
The invention relates to the technical field of negative temperature coefficient thermistor materials for linear temperature sensors, in particular to a functional material composition for a linear temperature sensor and a preparation method thereof. When the invention is used, the defect of small heat conductivity coefficient of the traditional NTC heat-sensitive powder material is overcome, an Al N material is introduced, the heat conductivity coefficient of the Al N material is about 260w/m.k, and the heat conductivity coefficient of the conventional oxide electronic ceramic material is about 1 w/m.k; the Al N material is 200 times of the NTC material, so that the method for greatly increasing the heat conductivity coefficient of the NTC material composition is provided, the problem of slow thermal response time is further solved, the heated local part of the tube core material is quickly heated up, the electric resistivity is quickly reduced to be below a set value, and the aim of quickly alarming is finally fulfilled.
Description
Technical Field
The invention relates to the technical field of negative temperature coefficient thermistor materials for linear temperature sensors, in particular to a functional material composition for a linear temperature sensor and a preparation method thereof.
Background
In order to ensure the normal operation of these equipments or facilities, it is necessary to constantly monitor the temperature conditions of various points in the concerned area, and in particular to know whether the highest temperature value in the area exceeds the alarm point, so as to avoid the occurrence of serious accidents. When monitoring the temperature of an area over-temperature, it is a common practice to monitor the temperature of the area to be monitored by a "point-temperature" temperature sensor, but when the area to be monitored is large, such a monitoring system is extremely complex and difficult to achieve. At present, several space distribution temperature out-of-limit sensors are widely applied, such as a resistance type, a thermocouple type and a fixed point type, wherein a linear temperature alarm cable (thermocouple type) is most widely applied. A linear temperature alarm cable is a linear temperature sensor that can detect the highest temperature present on a continuous line.
A linear temperature sensor is also called a continuous coaxial thermosensitive cable or simply a thermosensitive cable, and fig. 1 is a schematic structural diagram thereof; when the temperature T1 of the linear temperature sensor at a point along the wire exceeds the temperature of the rest of the cable, the resistance of the NTC thermo-sensitive material between the two hot electrodes at that point decreases, thus forming an "l temporary" measuring end at point T1. The flexible thermal cable then resembles a conventional thermocouple, with a thermoelectric potential corresponding to temperature T1 developed between the two hot electrodes. If the wire has a higher temperature at a second point T2 along the way, the resistance of the NTC material between the hot electrodes at point T2 will drop lower than that at the positive point, thus creating a new "2 temporary" measuring terminal at point T2, and simultaneously outputting a thermoelectric voltage corresponding to the temperature L between the hot electrodes. The linear temperature sensor is a thermocouple with a continuously running measuring end, the temperature of which point on the cable is high, the measuring end runs to which point, and the thermoelectric potential output by the linear temperature sensor always corresponds to the highest temperature existing along the cable. If the surface thermocouples are reasonably located within a region (e.g., on a surface), the temperature reflected by the output thermal potential of the linear temperature sensor may be considered the highest temperature present within the region (e.g., the covering surface). Fig. 1,2 and 3 are schematic diagrams of the working principle of a standard thermocouple and a linear temperature sensor respectively.
The key of the prior art linear temperature sensor which can be used for temperature measurement and alarm is the NTC thermosensitive material filled around the electrodes, which must have good negative temperature thermosensitive characteristics, i.e. the resistance decreases as the temperature increases. Currently, the research uses a ternary system of ferric oxide, nickel oxide and manganese oxide as a mainstream technology, and prepares the NTC thermosensitive powder material with a spinel structure by a solid-phase reaction sintering method;
however, the existing transition element oxide series NTC thermosensitive powder materials have the problems of small heat conductivity coefficient and slow thermal response time, so that the local whole heated pipe core material cannot be heated quickly, the resistivity cannot be reduced below a set value quickly, the alarm cannot be given out after the delay, certain problems exist in the aspect of reliability, and the wide application of the product is seriously restrained. Therefore, the person skilled in the art provides a functional material composition for a linear temperature sensor and a method for preparing the same to solve the problems mentioned in the background art.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a functional material composition for a linear temperature sensor, which is formed by compounding two phases of materials, wherein the first phase is an NTC material as a main material phase, the other phase is a second phase substance as a matter for improving the thermal conductivity of the main material, and the two phases are uniformly mixed at normal temperature to form the functional material composition;
the NTC material is a functional material main body for the linear temperature sensor and is used as the functional material main body for the linear temperature sensor;
the second phase material is selected from carbide and nitride with excellent heat conductivity and insulating property.
Preferably: the NTC element with high surge current resistance and the composition range are 80-95 wt% of NTC material and 5-20 wt% of aluminum nitride.
Preferably: the NTC material and the aluminum nitride are obtained by mechanically and uniformly mixing at normal temperature.
Preferably, the NTC heat-sensitive powder material with the spinel structure is prepared by a solid-phase reaction sintering method by mainly taking three elements of iron oxide, nickel oxide and manganese oxide as main materials.
Preferably, the second phase material is selected from common silicon carbide, silicon nitride, aluminum nitride and boron nitride, and the aluminum nitride is NTC thermistor material composition as an example second phase material.
Preferably, the functional material composition consists of the NTC material and aluminum nitride.
A preparation method of a functional material composition of a linear temperature sensor comprises the following preparation steps:
firstly, preparing and granulating the NTC material, respectively weighing the two substances according to the proportion of 80-95 wt% of the NTC material and 5-20 wt% of aluminum nitride, mixing, wet-grinding to obtain NTC element composition slurry, and then drying the NTC element composition slurry for later use; obtaining NTC functional material powder for later use;
secondly, performing NTC material, and further pressing into a tube core;
thirdly, quenching the stainless steel pipe to ensure that the stainless steel pipe is soft, easy to pull and bendable;
fourthly, the cable is cored and pulled;
fifthly, cable row adhesion;
sixthly, welding a steel pipe and sealing a terminal at a short distance;
and seventhly, cleaning the outer pipe.
The invention has the technical effects and advantages that:
the defect that the conventional NTC heat-sensitive powder material has small heat conductivity coefficient is overcome, and in order to improve the heat conductivity coefficient of the material, an AlN material is introduced, the heat conductivity coefficient of the AlN material is about 260w/m.k, and the heat conductivity coefficient of the conventional oxide electronic ceramic material is about 1 w/m.k; the AlN material is 200 times of the NTC material, so that a method capable of greatly increasing the heat conductivity coefficient of a composition of the NTC material is provided, the problem of slow thermal response time is further solved, the heated local whole of the tube core material is rapidly heated, the electric conductivity resistivity is rapidly reduced to be below a set value, and the aim of rapidly alarming is finally fulfilled;
under the condition of unchanging NTC effect, the heat conductivity of the material is greatly improved, so that the material has more practical capability, according to the seepage theory, the threshold value of the two phases of mixture is about 25-30 wt%, and through a large number of experiments, the adding amount of the NTC functional material composition AlN ranges from 5-25 wt%, and the optimal amount is 10-20 wt%.
Drawings
FIG. 1 is a schematic view of a coaxial thermal cable configuration provided herein;
FIG. 2 is a schematic diagram of the working principle of a standard thermocouple provided in the present application;
FIG. 3 is a schematic diagram of the working principle of the linear temperature sensor provided by the present application;
FIG. 4 is a schematic diagram of the working principle of the linear temperature sensor provided in the present application;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Example 1
The functional material composition of the present example comprises the following components in parts by weight:
95 parts of NTC material and 5 parts of aluminum nitride.
The samples were prepared using the manufacturing process flow preparation steps and the experimental data are shown in table 1.
Example 2
The functional material composition of the present example comprises the following components in parts by weight:
90 parts of NTC material and 10 parts of aluminum nitride.
The samples were prepared using the manufacturing process flow preparation procedure and the experimental data are shown in table 1.
Example 3
The NTC element composition of the present embodiment comprises the following components in parts by weight:
80 parts of NTC material and 20 parts of aluminum nitride.
The samples were prepared using the manufacturing process flow preparation procedure and the experimental data are shown in table 1.
Example 4
The functional material composition of the present example comprises the following components in parts by weight:
75 parts of NTC material and 25 parts of aluminum nitride.
The samples were prepared using the manufacturing process flow preparation procedure and the experimental data are shown in table 1.
Comparative example 1
The functional material composition of the comparative example had the following composition in parts by weight:
100 parts of NTC material.
The samples were prepared using the manufacturing process flow preparation procedure and the experimental data are shown in table 1.
Comparative example 2
The functional material composition of the comparative example had the following composition in parts by weight:
70 parts of NTC material and 30 parts of aluminum nitride.
The samples were prepared using the manufacturing process flow preparation steps and the experimental data are shown in table 1.
TABLE 1
The response time measuring method is that the time is burned under an alcohol lamp until the integral resistance value of the sensor reaches less than 200k for alarming.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art and related arts based on the embodiments of the present invention without any creative effort, shall fall within the protection scope of the present invention. Structures, devices, and methods of operation not specifically described or illustrated herein are generally practiced in the art without specific recitation or limitation.
Claims (7)
1. A functional material composition of a linear temperature sensor is compounded by two-phase materials, and is characterized in that a first phase is an NTC material which is used as a main material phase, the other phase is a second phase substance which is used as a main material phase for improving the heat conductivity of the main material, and the two phases are uniformly mixed at normal temperature to form the functional material composition;
the NTC material is a functional material main body for the linear temperature sensor and is used as the functional material main body for the linear temperature sensor;
the second phase material is selected from carbide and nitride with excellent heat conductivity and insulating property.
2. The functional material composition for linear temperature sensor as claimed in claim 1, wherein the NTC element with high inrush current resistance and composition range is 80-95 wt% of NTC material and 5-20 wt% of aluminum nitride.
3. The functional material composition for linear temperature sensor according to claim 1, wherein the NTC material and the aluminum nitride are mechanically mixed at room temperature to form a uniform mixture.
4. The functional material composition for linear temperature sensors as claimed in claim 1, wherein said NTC material is an NTC thermal sensitive powder material with spinel structure prepared by solid phase reaction sintering method and mainly using three elements of iron oxide, nickel oxide and manganese oxide.
5. The functional material composition for linear temperature sensor as claimed in claim 1, wherein the second phase material is selected from silicon carbide, silicon nitride, aluminum nitride and boron nitride.
6. The functional material composition for linear temperature sensor as claimed in claim 5, wherein the functional material composition is composed of the NTC material and aluminum nitride.
7. The method for preparing the functional material composition for linear temperature sensors according to claim 1, comprising the following steps:
firstly, preparing and granulating the NTC material, respectively weighing the two substances according to the proportion of 80-95 wt% of the NTC material and 5-20 wt% of aluminum nitride, mixing, wet-grinding to obtain NTC element composition slurry, and then drying the NTC element composition slurry for later use; obtaining NTC functional material powder for later use;
secondly, performing NTC material, and further pressing into a tube core;
thirdly, quenching the stainless steel pipe;
fourthly, the cable is cored and pulled;
fifthly, cable row sticking;
sixthly, welding a steel pipe and sealing a terminal at a short distance;
and seventhly, cleaning the outer pipe.
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