CN1369705A - Method for measring temp gradient in directional settling procedure - Google Patents
Method for measring temp gradient in directional settling procedure Download PDFInfo
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- CN1369705A CN1369705A CN 02111052 CN02111052A CN1369705A CN 1369705 A CN1369705 A CN 1369705A CN 02111052 CN02111052 CN 02111052 CN 02111052 A CN02111052 A CN 02111052A CN 1369705 A CN1369705 A CN 1369705A
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- thermopair
- directional solidification
- thermograde
- bar
- thermocouple
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Abstract
A measuring method of temperature gradient in directinoal solidifying course places directinoal solidifying bar imbedded with thermocouple at its centre into quartx tube of thin wall and sets it at end part of ingot pulling device. The thermocouple will be connected with recorder and the paper moving speed Vp of recorder as well as the moving speed Vd of thermocouple and directional solidifying bar should be finalized. The paper moving distance delta x of recorder and the temperature different delta T of this novel distance can be read out when the melting zone is close to and passing through the end part of thermocouple. The temp gradient G of solid-liquid interface in melting zone can be calculated out through the formula of G=delta T X VP/delta X X Vd.
Description
Technical field:
The present invention relates to a kind of measuring method of thermograde, relate in particular to the measuring method of thermograde in a kind of directional solidification process, belong to and solidify and the melting technique field.
Background technology:
In the directional solidification process, adopt and force the one dimension heat radiation to make melt form certain thermograde, thereby process of setting is carried out along thermograde direction orientation in a certain direction, obtain oriented freezing organization.One of key parameter of directional solidification process control is exactly a thermograde.Thermograde is a vector, and its direction is to point to the direction of temperature rising along the normal of isothermal surface, and its size just equals unit length variation of temperature in the direction.Thermograde is a very important solidifying process parameter in the directional solidification process, the height of thermograde will influence the mixability in zone length and the melting zone, can directly have influence on the institutional framework and the performance of unidirectional solidification material, also be whether the decision interface unsettled important parameter occurs.So it is particularly important that the measurement of temperature gradient of solid-liquid interface just seems.
Because the singularity of device for directionally solidifying structure, the melting zone is generally shorter, and the melting zone is constantly mobile, so difficulty is just compared in the measurement of thermograde.The report of therefore relevant thermograde measuring technique also seldom especially under vacuum condition, has more increased the difficulty of measuring.
Thermograde mainly obtains by rough estimation at present.Elder generation's rough measure melt solid-liquid interface is from the distance L of specific heat eliminating medium, measures or according to the temperature T of melting point substance estimation melt, by accounting temperature gradient G=T/L, obtains rough thermograde G then.This estimation often deviation is bigger, and data are unreliable.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art and actual demand, the measuring method of thermograde in a kind of directional solidification process is provided, accurately measure the thermograde in the directional solidification process, make measurement data accurately and reliably, and method is simple and practical.
For realizing such purpose, the present invention adopts thermopair to measure thermograde in the directional solidification process, in the directional solidification bar, immersion thermocouple, and thermopair is connected with registering instrument, by the translational speed and the temperature difference of thermopair and directional solidification bar in the record process of setting, can measure thermograde.
Concrete grammar of the present invention is:
1, selects a kind of unidirectional solidification material for use,, process a cylindrical hole bigger slightly at the centre or the first half of directional solidification bar, as the thermopair mounting hole than thermopair diameter as various metal bars;
2, thermopair is imbedded and is fixed in the thermopair mounting hole of directional solidification bar, selecting for use according to the character of directional solidification bar of thermopair decided, available nickel chromium-nickel silicon thermocouple, also available single platinum rhodium or double platinum rhodium thermopair;
3, the directional solidification bar that will install thermopair is packed in the thin-walled quartz ampoule;
4, thermopair is connected on the registering instrument, and the chart drive speed V of definite registering instrument
p
5, after directional solidification began, directional solidification bar and thermopair were with same speed V
dMove down, the melting zone near and during end by thermopair, playback record instrument paper feed distance, delta X and pass by this apart from the time temperature difference Δ T, just can pass through formula
Calculate and accurately measure the thermograde G of melting zone solid-liquid interface.
Method of the present invention is simple and practical, can measure the thermograde of device for directionally solidifying in process of setting exactly, and measurement data has solved the thermograde problems of measurement in the device for directionally solidifying accurately and reliably effectively.
Description of drawings and embodiment:
Below by accompanying drawing and specific embodiment technical scheme of the present invention is further described.
Fig. 1 is the placement synoptic diagram of thermopair in the directional solidification bar.
As shown in the figure, a cylinder slightly bigger than thermocouple diameter is arranged near the center of directional solidification bar 4 Shape thermocouple mounting hole 3, thermocouple 2 inserts and is fixed in the directional solidification rod 4 directional solidification bar 4 Be contained in the thin-walled quartz ampoule 5, and be positioned over the end of ingot pulling mechanism 8. Thermocouple 2 connects by lead 1 To recorder.
The method processing of thermopair mounting hole 3 the most handy line cuttings, because line cutting processing dimensional accuracy height, the position is accurate, is convenient to the installation of thermopair 2.Through hole with the line cutting processing can block up with the cylindrical rod that cuts out, and also available one section solid bar links to each other to determine the position of thermopair with hollow bar.
Embodiment 1:
Heating power is 14KW, and TbDyFe alloy withdrawing rate in the directional solidification process is V
dDuring=1.36mm/min, Δ T=45 ℃, Δ X=6mm, V
p=2mm/s calculates thermograde G
1=662 ℃/cm
Embodiment 2:
Heating power is 15KW, and the freezing rate of TbDyFe alloy in the directional solidification process is V
d=1.36mm/min, Δ T=54.7 ℃, Δ X=5mm, V
p=2mm/s calculates thermograde G
2=965 ℃/cm.
Claims (3)
1, the measuring method of thermograde in a kind of directional solidification process, it is characterized in that thermopair (2) is imbedded and is fixed in the middle thermopair mounting hole (3) of directional solidification bar (4), again directional solidification bar (4) is packed in the thin-walled quartz ampoule (5) and be positioned over the end of ingot pulling mechanism (8), thermopair (2) is connected on the registering instrument, and the chart drive speed V of definite registering instrument
pAnd directional solidification begins the translational speed V of back directional solidification bar (4) and thermopair (2)
d, when melting zone (6) near and during end by thermopair (2), playback record instrument paper feed distance, delta X and pass by this apart from the time temperature difference Δ T, pass through formula
Calculate the thermograde G of melting zone solid-liquid interface.
2,, it is characterized in that thermopair mounting hole (3) is 30mm from directional solidification bar end-to-end distance from the length of (D) as the measuring method of thermograde in the said directional solidification process of claim 1.
3,, it is characterized in that thermopair (2) adopts nickel chromium-nickel silicon thermocouple, single platinum rhodium or double platinum rhodium thermopair as the measuring method of thermograde in the said directional solidification process of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021110522A CN1160560C (en) | 2002-03-15 | 2002-03-15 | Method for measring temp gradient in directional settling procedure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021110522A CN1160560C (en) | 2002-03-15 | 2002-03-15 | Method for measring temp gradient in directional settling procedure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1369705A true CN1369705A (en) | 2002-09-18 |
| CN1160560C CN1160560C (en) | 2004-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021110522A Expired - Fee Related CN1160560C (en) | 2002-03-15 | 2002-03-15 | Method for measring temp gradient in directional settling procedure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775650A (en) * | 2010-03-12 | 2010-07-14 | 厦门大学 | Preparation method of solar polycrystalline silicon cast ingot and device thereof |
| CN102528003A (en) * | 2010-12-09 | 2012-07-04 | 中国科学院金属研究所 | Closed water flow direct-cooling device and method for directional solidification |
| CN104569031B (en) * | 2014-12-26 | 2017-06-13 | 广东工业大学 | For the experimental provision and method of nano-fluid directional solidification |
| CN109856183A (en) * | 2019-03-25 | 2019-06-07 | 上海工程技术大学 | A kind of measuring method and device of the metal mold counter-pressure casting solid liquid interface coefficient of heat transfer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759416B (en) * | 2012-07-19 | 2013-11-13 | 中国科学院金属研究所 | Continuous temperature measuring device and method during directional solidification |
-
2002
- 2002-03-15 CN CNB021110522A patent/CN1160560C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775650A (en) * | 2010-03-12 | 2010-07-14 | 厦门大学 | Preparation method of solar polycrystalline silicon cast ingot and device thereof |
| CN101775650B (en) * | 2010-03-12 | 2013-01-30 | 厦门大学 | Preparation method of solar polycrystalline silicon cast ingot and device thereof |
| CN102528003A (en) * | 2010-12-09 | 2012-07-04 | 中国科学院金属研究所 | Closed water flow direct-cooling device and method for directional solidification |
| CN102528003B (en) * | 2010-12-09 | 2013-08-21 | 中国科学院金属研究所 | Closed water flow direct-cooling device and method for directional solidification |
| CN104569031B (en) * | 2014-12-26 | 2017-06-13 | 广东工业大学 | For the experimental provision and method of nano-fluid directional solidification |
| CN109856183A (en) * | 2019-03-25 | 2019-06-07 | 上海工程技术大学 | A kind of measuring method and device of the metal mold counter-pressure casting solid liquid interface coefficient of heat transfer |
| CN109856183B (en) * | 2019-03-25 | 2021-12-17 | 上海工程技术大学 | Method and device for measuring heat exchange coefficient of metal mold counter-pressure casting solid-liquid interface |
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| Publication number | Publication date |
|---|---|
| CN1160560C (en) | 2004-08-04 |
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