CN1404163A - Single-core RE complex-casing thermocouple - Google Patents
Single-core RE complex-casing thermocouple Download PDFInfo
- Publication number
- CN1404163A CN1404163A CN01141702.1A CN01141702A CN1404163A CN 1404163 A CN1404163 A CN 1404163A CN 01141702 A CN01141702 A CN 01141702A CN 1404163 A CN1404163 A CN 1404163A
- Authority
- CN
- China
- Prior art keywords
- core
- thermocouple
- complex
- casing
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000463 material Substances 0.000 claims abstract description 12
- 229910021484 silicon-nickel alloy Inorganic materials 0.000 claims abstract description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 229910001120 nichrome Inorganic materials 0.000 claims description 4
- 150000002910 rare earth metals Chemical class 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 2
- 229910000946 Y alloy Inorganic materials 0.000 abstract description 5
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 abstract description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 12
- 239000000395 magnesium oxide Substances 0.000 description 12
- 239000011159 matrix material Substances 0.000 description 9
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 238000009529 body temperature measurement Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 101150062705 Wipf3 gene Proteins 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000003026 anti-oxygenic effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The single-core RE complex-casing thermocouple features the positive pole of Ni-Cr-Y alloy protecting pipe, the negative pole of Ni-Si alloy wire in the central hole of MgO column inside the protecting pipe, and one casing of the same material as the protecting pipe and outside the protecting pipe. It may be used to replace platinum-rhodium thermocouple for application below 130 deg.c and has long service life, high temperature measuring precision, and low cost.
Description
The present invention relates to a kind of single-core RE casing thermocouple material
Industrial departments such as metallurgy, glass, pottery are big technical barriers at the temperature-measurement material that uses below 1300 ℃ always, and data at home and abroad is explored many approach to this.
K type thermocouple in the market, φ 3.2mm be 1300 ℃ of continuously heating after more than 100 hour, because of the preferential oxidation of Cr, causes that thermoelectric potential changes and overproof.1300 ℃ of continuously heating after 300 hours, the matrix undergauge original 3/5, oxide skin thickens, come off fully with matrix, the inner complete oxidation of matrix, the crystal boundary place becomes the cavity and makes the matrix be full of cracks.
The N type thermocouple that International Electrotechnical Commission (IEC) is recommended, adopt the approach that improves Cr and Si content, improve its high-temperature oxidation resistance and elevated temperature heat electromotive force stability, the nichrome (the NP utmost point) that contains Cr16% is 1300 ℃ of heating after 300 hours, the matrix heart Cr of portion has been depleted to 11.6%, matrix border Cr has been depleted to 5.8%, and, the high-temperature oxidation resistance of its negative pole (the NN utmost point) anodal (the NP utmost point) is also poor, and along with increasing (as more than 4.0%) of Si content, its hot-working character also degenerates thereupon, the high-temperature behavior of N type thermocouple under 1300 ℃ is described, not very good yet, to its chemical composition, need redesign.
At present, the casing thermocouple on the market is done protection tube with stainless steel usually, and its highest temperature serviceability temperature is no more than 700 ℃, has limited the use at high temperature of this sleeve pipe idol.
The casing thermocouple of the heavy wall crin that foreign data is introduced and the casing thermocouple of composite tube type, in the diplopore of insulating material MgO post, be installed with positive and negative two thermo wires respectively, the restriction in space in being subjected to managing, both positive and negative polarity thermo wires spacing and all very near with the spacing of tube wall, cause at high temperature and use for a long time, the insulation resistance of its magnesium oxide post descends, and causes streaming error, has reduced temperature measurement accuracy.(Fig. 2)
The present invention is intended to overcome some deficiency of known technology, and a kind of single-core RE complex-casing thermocouple is provided.
The object of the present invention is achieved like this:
1, positive pole is the tubing made from the nichrome material that adds the rare earth yttrium, and its chemical composition percentage by weight is Cr9.0～16.0%, Si0.1～0.4%, Ni+Co8.33～90.8, Y0.1～0.3%% and unavoidable impurities; 2, negative pole is to be through the nickel silicon alloy thermo wires that MgO post center single hole contains Si2.5～4.0%; 3, be with and its composite bushing in the outside of protection tube with material.
Advantage of the present invention: thermo wires is thicker, and the both positive and negative polarity spacing is bigger, can prolong useful life substituting the platinum rhodium thermocouple use below 1300 ℃, has improved temperature measurement accuracy, has saved a large amount of rare precious metal platinum; Integrate protection tube and positive pole, saved anodal materials, reduced cost.
Description of drawings:
Fig. 1 is a single-core RE complex-casing thermocouple of the present invention;
1, anodal pipe 1; 2, anodal pipe 2; Pipe 1 and pipe 2 are same Ni-Cr-Y alloy material; 3, negative pole nickel silicon alloy thermo wires.
Fig. 2 is the casing thermocouple of the on-the-spot ordinary construction of using usually.
Be installed with anodal and negative pole thermo wires in the MgO post diplopore in protection tube.
Describe the details that proposes embodiment according to the present invention in detail below in conjunction with accompanying drawing.
As can be seen from Figure 1: have only MgO post in the heat resisting steel protection tube to be installed with positive and negative two thermo wires when changing a thermo wires into, could enlarged tube in space around the thermo wires; Change original shape during that root thermo wires of only being removed---become tubing by thermo wires, play the effect of heat resisting steel protection tube simultaneously again, just can achieve the goal.
Show by a large amount of experiments: after anodal nichrome adds rare Y element, at high temperature use for a long time, the surface forms close-knitted oxide film, the Y element discrete distribution is in alloy substrate, it is the very active element of chemical property, very big with the affinity of oxygen, have precedence over the oxidation of Cr, so slowed down the interior external oxidation of Cr, form with field trash is distributed on the matrix crystal boundary, as the tree coring by interlocking oxide film---basal body interface stretches to matrix, these field trashes and root whiskers are by the Y of enrichment
2O
3With a small amount of Cr
2O
3NiO (spinel structure) constitutes, and Y
2O
3Fusing point up to 2400 ℃, this had both strengthened crystal boundary, again oxide-film and matrix was locked together securely, thereby had improved the elevated temperature heat electrical stability of the high-temperature oxidation resistance of Ni-Cr-Y alloy greatly.
In this respect, the effect of adding rare earth element y is more effective than simple raising Cr, Si content, adds rare earth element y again, improves Cr content again, and better effects if sees the following form:
Thermoelectric potential deviation contrast table in 1300 ℃ of heating generation in about 500 hours
The K type idol that φ 3.2mm adds Y 1300 ℃ in air 800～1000 hours thermoelectric potential deviations of continuous constant temperature heating be no more than dut temperature ± 0.75%, improve the thermocouple of Cr content 1300 ℃ of continuous heating 1000 hours and add Y, the thermoelectric potential deviation is+60 μ v, is lower than+2 ℃.
This shows that the tubing with the Ni-Cr-Y alloy material is made substitutes the use of heat resisting steel protection tube, and its heat resistance is more excellent.
Like this, be through the negative pole nisiloy thermo wires in the MgO post center single hole in the pipe, can overstriking, improved the useful life under the high temperature.
And anodal pipe 1 material and negative pole thermo wires storeroom have increased insulation resistance apart from than obviously increasing between the casing thermocouple positive and negative electrode of Fig. 2 ordinary construction and with the spacing of tube wall, have improved temperature measurement accuracy.
In order further to improve the high-temperature stability of single-core RE casing thermocouple, outside at this single-core RE sleeve pipe idol pipe 1 is with and manages 1 pipe 2 with material, like this, both increased should idol intensity, crystal boundary that this idol material is at high temperature grown up is discontinuous on the boundary face of pipe 1 and pipe 2, prevent to pollute to internal penetration, the deterioration that stops thermocouple material not only has excellent antioxygenic property, also has excellent also first performance.
In order to eliminate string film effect, between rare earth protection tube and outer tube, accompany the MgO layer.
(Fig. 3)
Embodiment:
1, presses the chemical analysis of Ni-Cr-Y alloy, be smelted into the garden ingot, forge into pipe, be processed into the high temperature resistant protection tube (being called for short pipe 1 and pipe 2) of the specification that requires.
2, will manage an end of 1 and seal into half knob.Center at this half knob is drilled to aperture, and its aperture is identical with the diameter of negative pole thermo wires.
3, the negative pole thermo wires is penetrated an end of the not end socket of pipe 1, and pass,, thermo wires and pipe 1 are welded with argon arc welding at this place from the centre bore that seals into half knob.
4, fill the MgO powder in this pipe 1, and on the thermo wires in this pipe 1, penetrate the MgO post of single hole, and this MgO post is pushed in the pipe gently, the rest may be inferred, up to manage fill up the MgO post in 1 till.
5, retract to desired specification with the pipe 1 of hammer of swaging with the above-mentioned MgO of filling up post.
6, will manage after 2 one ends seal into half knob and be enclosed within the above-mentioned pipe that is tightened 1 outside, tighten with the hammer of swaging again.
7, annealing, measurement.
Use specification
| External diameter φ mm | ?25.0 | ?22.0 | ?18.0 | ?16.0 | ?10.0 | ?8.0 | ?5.0 |
| Single-core line footpath φ mm | ?3.2 | ?2.5 | ?2.3 | ?2.2 | ?2.0 | ?1.8 | ?1.2 |
| Wall thickness φ mm | ?5.0 | ?4.0 | ?3.0 | ?2.0 | ?1.5 | ?1.2 | ?1.0 |
| Maximum operation (service) temperature ℃ | ?1280 | ?1250 | ?1200 | ?1150 | ?1100 | ?1000 | ?900 |
Claims (4)
1, a kind of single-core RE complex-casing thermocouple, it is characterized in that: positive pole is the tubing made from the nichrome material that adds the rare earth yttrium, and its chemical composition percentage by weight is Cr9.0～16.0%, Si0.1～0.4%, Ni+Co83.3～90.8%, Y0.1～0.3% and unavoidable impurities.
2, according to the described a kind of single-core RE complex-casing thermocouple of claim 1, it is characterized in that: negative pole is to be through the nickel silicon alloy thermo wires that MgO post center single hole contains Si2.5～4.0%.
3, according to the described a kind of single-core RE complex-casing thermocouple of claim 1, it is characterized in that: be with and its composite bushing with material in the outside of protection tube.
4, according to the described a kind of single-core RE complex-casing thermocouple of claim 1, it is characterized in that: between rare earth protection tube and outer tube, accompany the MgO layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011417021A CN1170323C (en) | 2001-09-13 | 2001-09-13 | Single-core RE complex-casing thermocouple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011417021A CN1170323C (en) | 2001-09-13 | 2001-09-13 | Single-core RE complex-casing thermocouple |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1404163A true CN1404163A (en) | 2003-03-19 |
| CN1170323C CN1170323C (en) | 2004-10-06 |
Family
ID=4676341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011417021A Expired - Fee Related CN1170323C (en) | 2001-09-13 | 2001-09-13 | Single-core RE complex-casing thermocouple |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1170323C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111684247A (en) * | 2018-01-31 | 2020-09-18 | 株式会社电装 | Temperature sensor |
| CN111684246A (en) * | 2018-01-31 | 2020-09-18 | 株式会社电装 | Temperature sensor and temperature measuring device |
-
2001
- 2001-09-13 CN CNB011417021A patent/CN1170323C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111684247A (en) * | 2018-01-31 | 2020-09-18 | 株式会社电装 | Temperature sensor |
| CN111684246A (en) * | 2018-01-31 | 2020-09-18 | 株式会社电装 | Temperature sensor and temperature measuring device |
| CN111684247B (en) * | 2018-01-31 | 2022-06-28 | 株式会社电装 | Temperature sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1170323C (en) | 2004-10-06 |
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Granted publication date: 20041006 Termination date: 20091013 |