CN1085838C - Steel liquid directly fixing aluminium sensor - Google Patents
Steel liquid directly fixing aluminium sensor Download PDFInfo
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- CN1085838C CN1085838C CN 97112202 CN97112202A CN1085838C CN 1085838 C CN1085838 C CN 1085838C CN 97112202 CN97112202 CN 97112202 CN 97112202 A CN97112202 A CN 97112202A CN 1085838 C CN1085838 C CN 1085838C
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- aluminum
- aluminium
- measurement sensor
- pipe
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Abstract
The present invention belongs to chemical sensing testing technology. The present invention aims to solve inconvenience to practical aluminum measurement due to changes in empirical constants along with smelting conditions during the conversion of the aluminum content according to the electromotive force of an oxygen measurement sensor in the process of indirect aluminum measurement through the oxygen measurement sensor for aluminum measurement at a high speed in molten steel at present; the present invention also aims to overcome the shortage that the experiment value obviously does not conform to the theoretical value when the oxygen activity in the molten steel is smaller than 1.8*10<-7>. To overcome the defects, a novel auxiliary electrode system (Al2O3 and Na3AlF6) is made into a direct aluminum measurement sensor in the technology. Test results indicate that the direct aluminum measurement sensor has the characteristics of short response time (within 10 seconds), freedom from the influence of test temperature, favorable conformity between the experiment value, the theoretical value and the chemical analysis value, etc.
Description
Invention field:
The invention belongs to the chemical sensitisation measuring technology.
Background technology:
The content of aluminium is important parameters very in the steel smelting procedure.Aluminium all has a significant impact the casting cycle of steel, the surface quality and the performance of steel.Therefore, the surplus aluminium amount of measuring quickly and accurately in the steel is very important.
The method of aluminium content is mainly undertaken by deciding lambda sensor in the fast measuring molten steel at present.Owing between oxygen content in the molten steel and the impurity element (or alloying element) certain restricting relation is arranged, at certain smelting condition; Can find out the relation of deciding between oxygen electromotive force and the surplus aluminium amount down:
Lg([％Al]×10
3)＝a+bE(mv)
Just can calculate aluminium content and (see K.Hagen et al. " Umschau-Technical Review " by deciding the lambda sensor electromotive force; Stahl and Eisen; 95 (1975); 398) E decides the lambda sensor electromotive force in the formula; a.b is an empirical constant; it changes with smelting condition change (as adding aluminium mode, cylinder-packing, argon shield etc.); this obviously brings many just the time to practical measurement; in addition; [Al]; [O] breaks away from equilibrium relation, decides aluminium with deciding lambda sensor, and oxygen activity is less than 1.8 * 10 in molten steel
-7The time, actual decide the aluminium experiment value and theoretical value obviously is not inconsistent, decide lambda sensor and be difficult to adopt (see figure 6).
Existing decide lambda sensor and decide the existing above-mentioned defective of aluminium for overcoming, the inventor has adopted a kind of novel auxiliary electrical polar system (Al
2O
3+ Na
3AlF
6) made direct fixing aluminium sensor.Experiment showed, that this sensor has reached satisfied Expected Results.
Summary of the invention:
Fig. 1 is direct fixing aluminium sensor section assembling synoptic diagram.It is mainly by ZrO
2(Mgo) solid electrolyte tube, contrast electrode (Mo+MoO
2) and auxiliary electrode (Al
2O
3+ Na
3AlF
6) three parts composition.ZrO wherein
2(MgO) be illustrated in ZrO
2In be added with a small amount of MgO.As shown in Figure 1, its assembling is the outer wall in solid electrolyte tube [4], by 950 ℃ of sintering processes auxiliary electrode [6] is invested on the base, adorns with (Mo+MoO at pipe [4] inner bottom part
2) as contrast electrode [7], fill with Al in the pipe
2O
3Powder [5], its upper end cover Al
2O
3Pipe [2] is also sealed [4] with high-temperature cement [3].By contrast electrode [7] when drawing Mo silk [1] with molten steel directly the molybdenum bar [8] of contact can be connected with secondary instrument by mistake plain conductor [9].
The said auxiliary electrode of the present invention is to use Al
2O
3And Na
3AlF
6Compound furnishing pasty state is coated in ZrO equably
2(MgO) pipe [4] surface, drying and sintering and make again.
Al
2O
3And Na
3AlF
6Set of dispense than can be according to Al shown in Figure 2
2O
3-Na
3AlF
6The system high-temperature phasor is T=1823-1873K in Range of measuring temp, makes solid-state Al
2O
3Selected with the principle of liquid equilibrium coexistence.The component of Que Dinging can not only make electrolyte and molten steel interface keep solid-state Al by this way
2O
3Exist, also can make oxygen ion conduction not interrupted because of liquid state exists.The invention implementation method:
Experiment of the present invention is at Al
2O
3In the crucible, interior dress 0.5kg steel material experimentizes under with pure Ar gas shiled in the molten steel of measuring, and aluminium content is adjusted by adding a certain amount of high-purity aluminium wire＞99.9% between 0.005-0.1%.To fully stir after adding aluminium at every turn, could insert fixing aluminium sensor and measure electromotive force.The insertion time is 10-20 second, and each is formed test fixing aluminium sensor 3-5 and props up, and gets to analyze before the sample with common and decide lambda sensor and advances once mensuration, so that compare with fixing aluminium sensor.
Experimental temperature is by the control of up-25 type temperature controller, and precision is ± 1K.The control fixing aluminium sensor inserts the time interval, make since the temperature variation that fixing aluminium sensor insertion molten steel causes in ± 5K.The cell emf of sensor is with the 3057-22 type strip chart recorder record of IM Ω internal resistance, so that analyzing responding process and value.
Experimental example is seen Fig. 3-7.
Fig. 3 typically decides the time dependent curve of aluminium electromotive force.Wherein ordinate EMF is for deciding the aluminium electromotive force, and mv is a millivolt, and horizontal ordinate t is the time, and s is second.Experiment condition is T=1823K, [%Al]=0.003.Near the platform that curve occurred 5 seconds is due to the instrument range deficiency.By experimental result as can be known, use the present invention, its response speed satisfied the on-site measurement requirement fully in 10 seconds.
Fig. 4 is the comparison (T=1823K) of experiment value (▲) Yu the calculated value () of electromotive force and aluminium activity logarithmic relationship.Experimental results show that the two meets better.
Fig. 5 is at T=1823-1873K, and the comparison of electromotive force and aluminium activity logarithmic relationship experiment value (▲) and theoretical () experimental results show that under different temperatures and measure that the two meets still better.
Fig. 6 is for deciding lambda sensor and deciding aluminium with common, the relation of its electromotive force and aluminium activity logarithm, and description of test, oxygen activity is less than 1.8 * 10 in molten steel
-7The time, experiment value and theoretical value obviously are not inconsistent.
Fig. 7 is when surveying aluminium with the present invention, and its test value and chemical analysis value be (T=1823K) relatively.Ordinate among the figure [%Al] cal is that sensor is decided the aluminium value, and horizontal ordinate [%Al] ana is a chemical analysis.Experiment shows that the two point of crossing (■) distributes and approach 45.Straight line, two values conform to better.
Claims (1)
1 one kinds of steel liquid directly fixing aluminium sensors, it comprises:
A is added with the ZrO of a small amount of MgO
2Solid electrolyte tube [4] reaches the auxiliary electrode [6] at its outer wall sintering,
B makes contrast electrode [7] at pipe [4] inner bottom part dress with Mo+MoO2,
Fill with Al in the c pipe
2O
3Powder [5] is at the top cover-Al of pipe [4]
2O
3Pipe [2], and will manage [4] with high-temperature cement [3] and be sealed,
D by the Mo silk [1] of drawing in the contrast electrode [7] with molten steel directly the molybdenum bar [8] of contact be connected with secondary instrument by plain conductor [9], it is characterized in that said auxiliary electrode is by Al
2O
3+ Na
3AlF
6System is made, and its set of dispense ratio can make solid-state Al according in Range of measuring temp
2O
3With liquid Na
3AlF
6The principle of balance coexistence is by Al
2O
3-Na
3AlF
6The system high-temperature phasor is selected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97112202 CN1085838C (en) | 1997-07-11 | 1997-07-11 | Steel liquid directly fixing aluminium sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97112202 CN1085838C (en) | 1997-07-11 | 1997-07-11 | Steel liquid directly fixing aluminium sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1205435A CN1205435A (en) | 1999-01-20 |
| CN1085838C true CN1085838C (en) | 2002-05-29 |
Family
ID=5172140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97112202 Expired - Fee Related CN1085838C (en) | 1997-07-11 | 1997-07-11 | Steel liquid directly fixing aluminium sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1085838C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101349670B (en) * | 2007-07-18 | 2012-01-04 | 宁波大学 | Apparatus and method for rapidly measuring trace amount aluminum content |
| CN101762631A (en) * | 2010-01-13 | 2010-06-30 | 河北理工大学 | Aluminum sensor used in hot dip galvanizing process and preparation method thereof |
-
1997
- 1997-07-11 CN CN 97112202 patent/CN1085838C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1205435A (en) | 1999-01-20 |
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