CN1303004A - Thick-film thermocouple for quickly measuring temp of molten steel and its making method - Google Patents
Thick-film thermocouple for quickly measuring temp of molten steel and its making method Download PDFInfo
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- CN1303004A CN1303004A CN 01107157 CN01107157A CN1303004A CN 1303004 A CN1303004 A CN 1303004A CN 01107157 CN01107157 CN 01107157 CN 01107157 A CN01107157 A CN 01107157A CN 1303004 A CN1303004 A CN 1303004A
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- platinum
- rhodium
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Abstract
A thick-film thermocouple for quickly measuring the temp. of molten steel is made up of superfine Pt powder and Rh powder or Pt-Rh alloy powder through mixing with glass powder and transparent thick liquid to obtain print slurry, then silk screen printing on ceramic substrate, after baking, high-temp. sintering, and soldering two compensating lines on the thick film temp.-sensing bulb. Its advantages include simple structure, high stability and reliability, high productivity, and low cost.
Description
The present invention relates to a kind of thermopair and manufacture method thereof, particularly a kind of thick-film type thermopair and manufacture method thereof of measuring liquid steel temperature.
Measuring temp of molten steel is a control material composition and the key link that guarantees smelting quality in the steelmaking process.The fast thermocouple that present China metallurgy industry is used for measuring temp of molten steel mainly is divided into quick platinum rhodium thermocouple and quick Wolfram rhenium heat electric couple two big classes; Because the time that platinum rhodium thermocouple is produced early, process stabilizing is reliable and the use habit of most of steel mill, the market share that present measuring temp of molten steel platinum rhodium fast thermocouple still has comparative advantage reaches more than 70%.China is the poor state of a platinum rhodium, and the platinum rhodium raw material more than 80% relies on import, not only need a large amount of foreign exchange expenditures, and the fluctuation of the international price of platinum rhodium raw material is very big, and rising range is serious, has increased many financial burden for the smelter of China.
The manufacture method of present domestic measuring temp of molten steel platinum rhodium fast thermocouple is with industrial Rt-PtR
10And PtRh
6-PtRn
30Thermocouple wire is cut into the length that needs, and through cleaning and annealing in process, manual then positive pole and the negative pole with thermoelectric wire is connected into the temperature-sensitive pyrometer fire-end with arc welding or oxyhydrogen welding, and the fibre special-purpose compensating wire of burn-oning adds and loads onto the protection overcoat and constitute fast thermocouple again.This manufacture method exists following shortcoming:
1. overall process is manual operations fully, and labour intensity is big, and production efficiency is low, in order to reduce precious metal material consumption, generally adopts 0.07mm or thinner silk material, has further increased operation easier.
2. precious metal material consumption is big, the cost height.At present China's measuring temp of molten steel is more than the 200Kg with precious metal material consumption every year.
3. owing to be manual operations, occur dry joint unavoidably, product reliability is low.
Purpose of the present invention just provide a kind of simple in structure, cost is low, the stable and reliable operation thick-film thermocouple for quickly measuring temp of molten steel.
Another object of the present invention provides the manufacture method of this thick-film thermocouple for quickly measuring temp of molten steel.
The objective of the invention is to realize that by such technical scheme it is that ceramic substrate is provided with two strip materials different and be connected with each other logical platinum film or platinum rhodium film, be welded with on the ceramic substrate respectively and two platinum films or the logical compensating wire of platinum rhodium symphysis.
The manufacture method of this thick-film thermocouple for quickly measuring temp of molten steel is made by following manufacturing process:
1) fine platinum powder and glass dust, thick transparency liquid are mixed into uniform platinum slurry with mortar or milling train;
2) mixed powder and glass dust, the thick transparency liquid with fine platinum-rhodium alloy powder or fine platinum powder and fine rhodium powder is mixed into uniform platinum rhodium slurry with mortar or milling train;
3) with the platinum slurry or the platinum rhodium slurry that prepare, method with serigraphy is printed onto on the ceramic substrate, after the oven dry, at high temperature it is carried out sintering, metal ingredient in the slurry is fused into band shape, by being bonded on the ceramic substrate after the fusing of the glass dust in the slurry, form platinum film or platinum rhodium film, promptly be the positive pole and the negative pole of thermopair, the positive pole of thermopair is to be made by platinum slurry or platinum rhodium slurry, and the negative pole of thermopair is to be made by the different platinum rhodium slurry of the content of the rhodium in the positive pole of the content of rhodium and thermopair;
4) on positive pole that bakes the thermocouple temperature sensitive body and negative pole, the compensating wire of special use in the soldering is packed in the protection assembly that generally adopts then, promptly becomes thick film thermocouple.
Owing to adopted technique scheme, the present invention to have simple in structure and the stable and reliable operation advantage, according to the prepared thick-film thermocouple for quickly of method of the present invention, can realize mechanized operation, enhance productivity; Replace silk material conductor with thick film conductor, reduce the consumption of precious metal material, thereby significantly reduce production costs; Because high temperature sintering fusing platinum powder and platinum rhodium powder are avoided the dry joint of a material to form thick film conductor.
Description of drawings of the present invention is as follows:
Fig. 1 is a structural representation of the present invention;
The invention will be further described below in conjunction with drawings and Examples:
As shown in Figure 1, the present invention is that ceramic substrate 1 is provided with two strip materials different and be connected with each other logical platinum film 2 or platinum rhodium film 2, is welded with the compensating wire 3 that is communicated with two platinum films 2 or platinum rhodium film 2 respectively on the ceramic substrate 1.
The manufacture method of this thick-film thermocouple for quickly measuring temp of molten steel is made by following manufacturing process:
1) fine platinum powder and glass dust, thick transparency liquid are mixed into uniform platinum slurry with mortar or milling train;
2) mixed powder and glass dust, the thick transparency liquid with fine platinum-rhodium alloy powder or fine platinum powder and fine rhodium powder is mixed into uniform platinum rhodium slurry with mortar or milling train;
3) with the platinum slurry or the platinum rhodium slurry that prepare, method with serigraphy is printed onto on the ceramic substrate, after the oven dry, at high temperature it is carried out sintering, metal ingredient in the slurry is fused into band shape, by being bonded on the ceramic substrate after the fusing of the glass dust in the slurry, form platinum film or platinum rhodium film, promptly be the positive pole and the negative pole of thermopair, the positive pole of thermopair is to be made by platinum slurry or platinum rhodium slurry, and the negative pole of thermopair is to be made by the different platinum rhodium slurry of the content of the rhodium in the positive pole of the content of rhodium and thermopair; Generally speaking, the thick film made of platinum slurry is as S type thermopair and PtRn
13The positive pole of thermopair, and the thick film made from platinum rhodium slurry is as the positive pole of Type B thermopair.
4) on positive pole that bakes the thermocouple temperature sensitive body and negative pole, during special-purpose compensating wire is packed the protection assembly that generally adopts then in the soldering, promptly become thick film thermocouple.
Described fine platinum powder, fine rhodium powder or fine platinum rhodium powder are in the salt solusion of platinum, rhodium or platinum rhodium, and reductive agent materials reduction such as adding hydrazine, formic acid, sodium formate make.
Described glass dust is with silicon dioxide SiO
2Be framework material, add an amount of diboron trioxide B
2O
3, magnesium oxide MgO, alundum (Al Al
2O
3, material such as baryta BaO, through fusing, shrend, grind and form.
Described thick transparency liquid is based on cellulose and terpinol, adds that organic substances such as an amount of dibutyl phthalate, butanols, tributyl citrate, p-dihydroxy-benzene, carbitol mix.
The described temperature that slurry is carried out sintering is between 1100 ℃～1400 ℃.
In described platinum slurry, fine platinum powder, glass dust, thick transparency liquid ratio by weight are: fine platinum powder is 65～70, and glass dust is 4.0～5.0, and thick transparency liquid is 20～40.
In described platinum rhodium slurry, the mixed powder of fine platinum-rhodium alloy powder or fine platinum powder and fine rhodium powder and glass dust, thick transparency liquid ratio by weight are: the mixed powder of fine platinum-rhodium alloy powder or fine platinum powder and fine rhodium powder is 65～70, glass dust is 4.0～5.0, and thick transparency liquid is 20～40.
In the mixed powder of fine platinum-rhodium alloy powder or fine platinum powder and fine rhodium powder, the content of rhodium can be 5%～7%, is made into the positive pole of thermopair with the mixed powder of this fine platinum-rhodium alloy powder or fine platinum powder and fine rhodium powder.
In the mixed powder of fine platinum-rhodium alloy powder or fine platinum powder and fine rhodium powder, the content of rhodium also can be 9%～11%, perhaps can be 12%～14%, perhaps can be 29%～31%, be made into the negative pole of thermopair with the mixed powder of the fine platinum-rhodium alloy powder of this class or fine platinum powder and fine rhodium powder.
Embodiment 1: the positive pole of making thick film thermocouple with pure platinum slurry, with the rhodium-containing amount is the negative pole that 10.5% platinum rhodium slurry is made thick film thermocouple, become the thick film platinum rhodium thermocouple at 1200 ℃ sintering temperatures, temperature---the thermoelectrical potential characteristic of the complete conformance with standard S type of its technical parameter industrial thermocouple (silk material).
Embodiment 2: making the positive pole of thick film thermocouple with pure platinum slurry, is the negative pole that 13.7% platinum rhodium slurry is made thick film thermocouple with the rhodium-containing amount, becomes the thick film platinum rhodium thermocouple at 1250 ℃～1300 ℃ sintering temperatures, and its technical parameter meets Pt-PtRh fully
13Temperature---the thermoelectrical potential characteristic of industrial thermocouple (silk material).
Embodiment 3: with the rhodium-containing amount is the positive pole that 6% platinum rhodium slurry is made thick film thermocouple, with the rhodium-containing amount is the negative pole that 31% platinum rhodium slurry is made thick film thermocouple, sintering temperature at 1350 ℃～1400 ℃ becomes the thick film platinum rhodium thermocouple, temperature---the thermoelectrical potential characteristic of the complete conformance with standard Type B of its technical parameter industrial thermocouple (silk material).
Claims (10)
1. thick-film thermocouple for quickly measuring temp of molten steel, it is characterized in that: ceramic substrate (1) is provided with two strip materials different and be connected with each other logical platinum film (2) or platinum rhodium film (2), is welded with the compensating wire (3) that is communicated with two platinum films (2) or platinum rhodium film (2) respectively on the ceramic substrate (1).
2. the manufacture method of thick-film thermocouple for quickly measuring temp of molten steel as claimed in claim 1 is characterized in that it is to make by following manufacturing process:
1) fine platinum powder and glass dust, thick transparency liquid are mixed into uniform platinum slurry with mortar or milling train;
2) mixed powder and glass dust, the thick transparency liquid with fine platinum-rhodium alloy powder or fine platinum powder and fine rhodium powder is mixed into uniform platinum rhodium slurry with mortar or milling train;
3) with the platinum slurry or the platinum rhodium slurry that prepare, method with serigraphy is printed onto on the ceramic substrate, after the oven dry, at high temperature it is carried out sintering, metal ingredient in the slurry is fused into band shape, by being bonded on the ceramic substrate after the fusing of the glass dust in the slurry, form platinum film or platinum rhodium film, promptly be the positive pole and the negative pole of thermopair, the positive pole of thermopair is to be made by platinum slurry or platinum rhodium slurry, and the negative pole of thermopair is to be made by the different platinum rhodium slurry of the content of the rhodium in the positive pole of the content of rhodium and thermopair;
4) on positive pole that bakes the thermocouple temperature sensitive body and negative pole, the compensating wire of special use in the soldering is packed in the protection assembly that generally adopts then, promptly becomes thick film thermocouple.
3. the manufacture method of thick-film thermocouple for quickly measuring temp of molten steel as claimed in claim 2, it is characterized in that: fine platinum powder, fine rhodium powder or fine platinum rhodium powder are in the salt solusion of platinum, rhodium or platinum rhodium, and reductive agent materials reduction such as adding hydrazine, formic acid, sodium formate make.
4. the manufacture method of thick-film thermocouple for quickly measuring temp of molten steel as claimed in claim 2, it is characterized in that: glass dust is with silicon dioxide SiO
2Be framework material, add an amount of diboron trioxide B
2O
3, magnesium oxide MgO, alundum (Al Al
2O
3, material such as baryta BaO, through fusing, shrend, grind and form.
5. the manufacture method of thick-film thermocouple for quickly measuring temp of molten steel as claimed in claim 2, it is characterized in that: thick transparency liquid is based on cellulose and terpinol, adds that organic substances such as an amount of dibutyl phthalate, butanols, tributyl citrate, p-dihydroxy-benzene, carbitol mix.
6. the manufacture method of thick-film thermocouple for quickly measuring temp of molten steel as claimed in claim 2, it is characterized in that: sintering temperature is between 1100 ℃～1400 ℃.
7. as the manufacture method of claim 2,3,4,5,6 described thick-film thermocouple for quickly measuring temp of molten steel, it is characterized in that: in the platinum slurry, fine platinum powder, glass dust, thick transparency liquid ratio by weight are: fine platinum powder is 65～70, glass dust is 4.0～5.0, and thick transparency liquid is 20～40.
8. as the manufacture method of claim 2,3,4,5,6 described thick-film thermocouple for quickly measuring temp of molten steel, it is characterized in that: in the platinum rhodium slurry, the mixed powder of fine platinum-rhodium alloy powder or fine platinum powder and fine rhodium powder and glass dust, thick transparency liquid ratio by weight are: the mixed powder of fine platinum-rhodium alloy powder or fine platinum powder and fine rhodium powder is 65～70, glass dust is 4.0～5.0, and thick transparency liquid is 20～40.
9. the manufacture method of thick-film thermocouple for quickly measuring temp of molten steel as claimed in claim 8, it is characterized in that: in the mixed powder of fine platinum-rhodium alloy powder or fine platinum powder and fine rhodium powder, the content of rhodium is 5%～7%, as the positive pole of thermopair.
10. the manufacture method of thick-film thermocouple for quickly measuring temp of molten steel as claimed in claim 8, it is characterized in that: in the mixed powder of fine platinum-rhodium alloy powder or fine platinum powder and fine rhodium powder, the content of rhodium is 9%～11%, perhaps be 12%～14%, perhaps be 29%～31%, as the negative pole of thermopair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011071575A CN1144029C (en) | 2001-02-20 | 2001-02-20 | Thick-film thermocouple for quickly measuring temp of molten steel and its making method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011071575A CN1144029C (en) | 2001-02-20 | 2001-02-20 | Thick-film thermocouple for quickly measuring temp of molten steel and its making method |
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|---|---|
| CN1303004A true CN1303004A (en) | 2001-07-11 |
| CN1144029C CN1144029C (en) | 2004-03-31 |
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|---|---|---|---|
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636282A (en) * | 2012-04-20 | 2012-08-15 | 上海理工大学 | High-frequency response thin-film thermode temperature sensor and preparation method thereof |
| CN102749148A (en) * | 2012-07-13 | 2012-10-24 | 中国航天空气动力技术研究院 | Manufacture method for membrane resistance thermometer |
| CN102944321A (en) * | 2012-12-07 | 2013-02-27 | 重庆材料研究院 | Preparation method of high-precision thick-film type thermocouple group for measuring micro-distance temperature difference |
| CN102944319A (en) * | 2012-12-07 | 2013-02-27 | 重庆材料研究院 | High-precision thick-film type thermocouple group for measuring micro distance temperature difference |
| CN106124075A (en) * | 2016-06-27 | 2016-11-16 | 安徽科联电气科技有限公司 | A kind of T-shaped hyperfine thermocouple manufacturing process |
| CN109640416A (en) * | 2019-01-23 | 2019-04-16 | 昆明大方自动控制科技有限公司 | A kind of Novel resistor fever tablet with temperature thermocouple |
| CN110752050A (en) * | 2019-10-28 | 2020-02-04 | 中国兵器工业集团第二一四研究所苏州研发中心 | Formula and preparation method of weldable conductive platinum slurry for high-temperature co-fired ceramic |
-
2001
- 2001-02-20 CN CNB011071575A patent/CN1144029C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636282A (en) * | 2012-04-20 | 2012-08-15 | 上海理工大学 | High-frequency response thin-film thermode temperature sensor and preparation method thereof |
| CN102636282B (en) * | 2012-04-20 | 2013-09-25 | 上海理工大学 | High-frequency response thin-film thermode temperature sensor and preparation method thereof |
| CN102749148A (en) * | 2012-07-13 | 2012-10-24 | 中国航天空气动力技术研究院 | Manufacture method for membrane resistance thermometer |
| CN102749148B (en) * | 2012-07-13 | 2013-10-30 | 中国航天空气动力技术研究院 | Manufacture method for membrane resistance thermometer |
| CN102944321A (en) * | 2012-12-07 | 2013-02-27 | 重庆材料研究院 | Preparation method of high-precision thick-film type thermocouple group for measuring micro-distance temperature difference |
| CN102944319A (en) * | 2012-12-07 | 2013-02-27 | 重庆材料研究院 | High-precision thick-film type thermocouple group for measuring micro distance temperature difference |
| CN102944321B (en) * | 2012-12-07 | 2014-07-16 | 重庆材料研究院 | Preparation method of high-precision thick-film type thermocouple group for measuring micro-distance temperature difference |
| CN102944319B (en) * | 2012-12-07 | 2015-01-07 | 重庆材料研究院 | High-precision thick-film type thermocouple group for measuring micro distance temperature difference |
| CN106124075A (en) * | 2016-06-27 | 2016-11-16 | 安徽科联电气科技有限公司 | A kind of T-shaped hyperfine thermocouple manufacturing process |
| CN109640416A (en) * | 2019-01-23 | 2019-04-16 | 昆明大方自动控制科技有限公司 | A kind of Novel resistor fever tablet with temperature thermocouple |
| CN110752050A (en) * | 2019-10-28 | 2020-02-04 | 中国兵器工业集团第二一四研究所苏州研发中心 | Formula and preparation method of weldable conductive platinum slurry for high-temperature co-fired ceramic |
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| Publication number | Publication date |
|---|---|
| CN1144029C (en) | 2004-03-31 |
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