CN202710199U - Continuous temperature measuring device in directional solidification process - Google Patents
Continuous temperature measuring device in directional solidification process Download PDFInfo
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- CN202710199U CN202710199U CN201220350902.4U CN201220350902U CN202710199U CN 202710199 U CN202710199 U CN 202710199U CN 201220350902 U CN201220350902 U CN 201220350902U CN 202710199 U CN202710199 U CN 202710199U
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Abstract
The utility model belongs to the field of temperature measurement, in particular to a continuous temperature measuring device in a directional solidification process, for solving the problem of high difficulty in continuous temperature measurement in the directional solidification process and the like. According to the utility model, a non-contact type thermocouple is adopted for continuously measuring the temperature values at different positions in the directional solidification process and accurately calculating the temperature gradient of a solid-liquid interface. A single-hole ceramic tube is arranged outside a double-hole ceramic tube; a clearance is formed between the double-hole ceramic tube and the single-hole ceramic tube; a mould case is arranged outside the single-hole ceramic tube; the double-hole ceramic tube is installed at the lower part of an upward lifting system; a platinum rhodium thermocouple is built in the double-hole ceramic tube; the temperature measuring end of the platinum rhodium thermocouple stretches to the lower part of the single-hole ceramic tube; the other end of the platinum rhodium thermocouple is connected with the input end of a paperless recorder; and the paperless recorder is used for automatically collecting the temperature values at different time. Time-based change of temperature in the paperless recorder is converted into distance-based change of temperature, so that the distribution condition of temperature fields at different positions in the directional solidification process can be reflected.
Description
Technical field:
The utility model belongs to the temperature measurement field, is specially a kind of directional solidification process continuous thermometering device.
Background technology:
Directional solidification technique is widely used in the turbo blade manufacturing of aeromotor and gas turbine.In the research process of directional solidification theory and technique, usually to determine the distribution situation in temperature field in the process of setting, so the temperature field when needing the alloy directional solidification is measured.Yet the directional solidification process is carried out under the vacuum seal condition, and the furnace temperature in the process of setting is up to 1700 ℃, so the furnace temperature data acquisition and processing (DAP) of directional solidification furnace difficulty, and the degree of accuracy of image data is low.At present, the furnace temperature collecting method commonly used of directional solidification furnace is as follows: at the diverse location of the ceramic shell mould ceramic pipe of built-in level (the inner sealing) of putting in advance, insert a thermopair in each ceramic pipe, all thermopairs are external in temperature measuring device, and this temperature measuring device gathers the different temperature values constantly of each thermopair automatically.Each thermopair of the method can only be measured same position place temperature with variation constantly, but can not measure temperature with the variation of vertical range, thereby is difficult to determine the distribution situation in temperature field in the process of setting.
The utility model content:
The purpose of this utility model is to provide a kind of directional solidification process continuous thermometering device, solves continuously measuring temperature difficulty in the directional solidification furnace, and thermograde is difficult to the through engineering approaches problems such as accurately calculating.
The technical solution of the utility model is:
A kind of directional solidification process continuous thermometering device, this continuous thermometering device comprises: recording instrument without paper, formwork, single hole ceramic pipe, diplopore ceramic pipe, platinum rhodium thermocouple, concrete structure is as follows:
Diplopore ceramic pipe arranged outside single hole ceramic pipe, leave the space between diplopore ceramic pipe and the single hole ceramic pipe, arranged outside formwork at the single hole ceramic pipe, the diplopore ceramic pipe is installed on the jacking system bottom, the built-in platinum rhodium thermocouple of diplopore ceramic pipe, the thermometric end of platinum rhodium thermocouple extends the bottom of single hole ceramic pipe, and the other end of platinum rhodium thermocouple is connected with the input end of recording instrument without paper.
Described directional solidification process continuous thermometering device, the solid phase alloy is positioned between single hole ceramic pipe and the formwork.
Described directional solidification process continuous thermometering device, the outside of formwork is provided with: formwork clamping bar, graphite annulus, formwork is by the clamping of formwork clamping bar, the arranged outside induction copper band of graphite annulus, be used for realization to the induction heating of solid phase alloy, form the alloy melting zone, solidifying between the part that alloy melting zone and alloy melting zone are following forms solid-liquid interface.
Described directional solidification process continuous thermometering device arranges crucible in the bottom of induction copper band, graphite annulus, separates by thermal baffle between graphite annulus and the crucible, and be liquid metal in the crucible, the bottom of formwork extends in the liquid metal.
Described directional solidification process continuous thermometering device, the bottom of crucible is lower jacking system.
Described directional solidification process continuous thermometering device, single hole ceramic pipe built-in equal height and bottom end seal in formwork, the single hole ceramic pipe maintains static in formwork and is parallel to the thermograde direction, and the alloy melt in platinum rhodium thermocouple and the formwork is by the isolation of single hole ceramic pipe.
Described directional solidification process continuous thermometering device, insert in the diplopore ceramic pipe of both ends open at the two poles of the earth of platinum rhodium thermocouple, and the bottom of diplopore ceramic pipe contacts with single hole ceramic pipe bottom, and diplopore ceramic pipe height is more than the formwork height.
Described directional solidification process continuous thermometering device, the length of diplopore ceramic pipe are 1-5 times of formwork height.
Described directional solidification process continuous thermometering device, the directional solidification furnace of being measured by continuous thermometering device comprises high speed water-cooled directional solidification furnace, liquid metal cooling directional solidification furnace or zone melting liquid metal cooling directional solidification furnace.
The beneficial effects of the utility model are:
1. the utility model is in the ceramic shell mould of investment cast, adopts in advance the single hole ceramic pipe of built-in bottom end seal that thermopair and alloy melt are isolated, so alloy melt do not contact with thermopair, and thermopair is reusable.The utility model adopts contactless thermopair, the temperature value of continuous coverage directional solidification process diverse location and the thermograde of accurately calculating solid-liquid interface.
2. the utility model thermopair and diplopore ceramic pipe are fixed as one, and jacking system is fixed on diplopore ceramic pipe top, and moving up and down of diplopore ceramic pipe is moving up and down of thermopair, can repeatedly measure the temperature under the different curing conditions.
3. the utility model thermopair the two poles of the earth are external in recording instrument without paper, and in the process that thermopair slowly at the uniform velocity moves, recording instrument without paper can gather different temperature constantly continuously automatically, and temperature value is accurate and continuous.
4. according to the temperature variation of recording instrument without paper and the solid-liquid phase line temperature range of alloy melt, but the thermograde of accurate Calculation solid-liquid interface.
Description of drawings:
Fig. 1 is zone melting liquid metal cool furnace synoptic diagram of the present utility model.Among the figure, the upper jacking system of 1-; The 2-recording instrument without paper; 3-formwork clamping bar; The 4-formwork; 5-solid phase alloy; 6-single hole ceramic pipe; 7-diplopore ceramic pipe; The 8-platinum rhodium thermocouple; 9-responds to copper band; The 10-graphite annulus; 11-alloy melting zone; 12-thermal baffle; The 13-solid-liquid interface; The 14-crucible; The 15-liquid metal; Jacking system under the 16-.
Fig. 2 be thermopair when static under the different heating frequency temperature with change curve constantly.
Fig. 3 does not move temperature under the speed with the change of distance curve for the same.
Fig. 4 is the DTA heating curve of SRR99 alloy.
Fig. 5 is the SRR99 alloy solid-liquid interface temperature gradient under the different heating frequency.
Embodiment:
The below is take zone melting liquid metal cool furnace as example, and used alloy is the SRR99 nickel base superalloy, introduces the calculating of method and the thermograde thereof of continuous temperature measurement.
As shown in Figure 1, the directional solidification process continuous thermometering device of the utility model zone melting liquid metal cool furnace mainly comprises: upper jacking system 1, recording instrument without paper 2, formwork clamping bar 3, formwork 4, solid phase alloy 5, single hole ceramic pipe 6, diplopore ceramic pipe 7, platinum rhodium thermocouple 8, induction copper band 9, graphite annulus 10, alloy melting zone 11, thermal baffle 12, solid-liquid interface 13, crucible 14, liquid metal 15, lower jacking system 16 etc., and concrete structure is as follows:
Diplopore ceramic pipe 7 is installed on jacking system 1 bottom, the diplopore ceramic pipe 7 interior platinum rhodium thermocouples 8 that arrange, and the thermometric end of platinum rhodium thermocouple 8 extends the bottom of single hole ceramic pipe 6, and the other end of platinum rhodium thermocouple 8 is connected with the input end of recording instrument without paper 2; Diplopore ceramic pipe 7 arranged outside single hole ceramic pipes 6, leave the space between diplopore ceramic pipe 7 and the single hole ceramic pipe 6, arranged outside formwork 4 at single hole ceramic pipe 6, solid phase alloy 5 is positioned between single hole ceramic pipe 6 and the formwork 4, the outside of formwork 4 is provided with: formwork clamping bar 3, graphite annulus 10, formwork 4 are by 3 clampings of formwork clamping bar, and the arranged outside of graphite annulus 10 is responded to copper band 9, be used for realization to the induction heating of solid phase alloy 5, form alloy melting zone 11; Bottom at induction copper band 9, graphite annulus 10 arranges crucible 14, separating by thermal baffle 12 between graphite annulus 10 and the crucible 14, is liquid metal 15 in the crucible 14, and the bottom of formwork 4 extends in the liquid metal 15, liquid metal 15 is used for the cool metal melt as cooling medium; Alloy melting zone 11 and alloy melting zone solidifying below 11 forms solid-liquid interface 13 between the part, the bottom of crucible 14 is lower jacking system 16.
In the utility model, liquid metal is generally directional solidification gallium-indium-tin alloy commonly used, adopts liquid metal can improve the thermograde of solidification front.
The key member of this device is: upper jacking system 1, recording instrument without paper 2, single hole ceramic pipe 6, diplopore ceramic pipe 7, platinum rhodium thermocouple 8.The effect of these five key members is as follows: the upper jacking system of 1-: make diplopore ceramic pipe (being platinum rhodium thermocouple) continuous moving, for continuous temperature measurement provides condition; The 2-recording instrument without paper: automatically gather different temperature values constantly, the temperature value interval is little and accurate; 6-single hole ceramic pipe: isolation thermopair and alloy melt, prevent that thermopair is contaminated, thermopair is reusable; 7-diplopore ceramic pipe: as the prop carrier of thermopair, it is at the uniform velocity mobile to drive thermopair by self movement; The 8-platinum rhodium thermocouple: detected temperatures changes in real time.
The utility model directional solidification process continuous temperature measurement method, in the ceramic shell mould of investment cast, thermopair and alloy melt are isolated in the employing in advance single hole ceramic pipe of built-in bottom end seal (the single hole ceramic pipe is parallel to the thermograde direction); The diplopore ceramic pipe bottom of both ends open is inserted at the two poles of the earth of thermopair, and the length of diplopore ceramic pipe will be more than the formwork height; Diplopore ceramic pipe top is fixed in jacking system and is external in recording instrument without paper; By slow at the uniform velocity mobile diplopore ceramic pipe, recording instrument without paper gathers different continuous temperature values constantly automatically.
At first, the single hole ceramic pipe of bottom end seal is fixed in the center of formwork or diverse location on every side, the bottom of single hole ceramic pipe and top flush with bottom and the top of formwork respectively.Secondly, thermopair the two poles of the earth are inserted in the diplopore ceramic pipe, the diplopore ceramic pipe is inserted single hole ceramic pipe bottom, formwork is fixed in the furnace chamber, upper jacking system in the furnace chamber is clamped diplopore ceramic pipe top, and the thermopair top is external in recording instrument without paper, the foundry alloy particle is placed in the formwork cavity again.Then, formwork is heated to foundry alloy fusing, after formwork and alloy melt reach thermal equilibrium, slowly moves the diplopore ceramic pipe that comprises thermopair at the uniform velocity, recording instrument without paper gathers the formwork temperature in the different moment automatically simultaneously.At last, temperature in the recording instrument without paper is changed into temperature with the variation of distance with variation constantly, thus the temperature field distribution situation of reflection directional solidification process diverse location; Can accurately calculate in addition the thermograde of furnace chamber with the solid-liquid phase line temperature range of the change curve of distance and alloy according to temperature.
Described directional solidification process continuous temperature measurement method, concrete steps are as follows:
(1) for high speed water cold-peace liquid metal cooling directional solidification furnace, in the wax-pattern module group assembling process of investment cast, the single hole ceramic pipe of bottom end seal is fixed in the center of formwork or diverse location on every side, and the single hole ceramic pipe is parallel to the thermograde direction; For zone melting liquid metal cooling directional solidification furnace, use the formwork of bottom end seal, the single hole ceramic pipe of bottom end seal is fixed in the center of formwork, and the single hole ceramic pipe is parallel to the thermograde direction;
(2) single hole ceramic pipe bottom flushes with the formwork bottom, and single hole ceramic pipe top flushes with the formwork top, and guarantees that the ceramic pipe in the formwork maintains static behind dewaxing-sintering;
(3) the diplopore ceramic pipe of both ends open is inserted at the two poles of the earth of platinum rhodium thermocouple, and the pad at the two poles of the earth is exposed to diplopore ceramic pipe low side, and the top at the two poles of the earth is exposed to the top of diplopore ceramic pipe, and the length of diplopore ceramic pipe is more than the formwork height; In the present embodiment, the length of diplopore ceramic pipe is 1-5 times of formwork height;
(4) in the formwork cavity, place the alloy fragment, then the formwork of built-in single hole ceramic pipe is fixed in the body of heater, the diplopore ceramic pipe that will comprise thermopair inserts in the single hole ceramic pipe, the bottom of diplopore ceramic pipe contacts with single hole ceramic pipe bottom, jacking system is fixed on the top of diplopore ceramic pipe, and thermopair the two poles of the earth are external in recording instrument without paper;
(5) adopt vacuum induction heating formwork: for high speed water cold-peace liquid metal cooling directional solidification furnace, heating-up temperature is 1400-1700 ℃; For zone melting liquid metal cooling directional solidification furnace, the heating frequency is 1000-1500Hz;
(6) temperature to be heated or heating frequency are when reaching settings, and alloy melt is static 1-20min in formwork, the diplopore ceramic pipe is moved at the uniform velocity, on the speed of moving be 0.1-100 μ m/s;
(7) move end on the diplopore ceramic pipe after, the diplopore ceramic pipe at the uniform velocity can be moved down, measure the temperature variation in the thermopair folding process, perhaps the diplopore ceramic pipe is displaced downwardly to the formwork low side, again move the diplopore ceramic pipe on, measure the temperature variation that moves past on the thermopair in the journey.
(8) process the automatic temperature value that gathers of recording instrument without paper and change into temperature with the limit variation of distance, and accurately calculate the thermograde of solid-liquid interface according to the solid-liquid phase line temperature range of alloy.
In the utility model, ceramic pipe is aluminium oxide, silicon nitride, silit, hexagonal boron nitride, WC, TiC, TaC, NbC or VC, and ceramic content is more than 99wt%.
In the utility model, the employed material of alloy melt is nickel base superalloy.
When thermopair was still in the alloy melting zone, the heating frequency was increased to the each instantaneous increase 100Hz of 1300Hz(from 1000Hz), temperature is with change curve constantly as shown in Figure 2 under the different heating frequency.This figure not only reflects the heating-up temperature that the different heating frequency is corresponding, and can reflect the needed heating-up time of different heating frequency.As seen from the figure: the heating frequency with the corresponding relation of temperature is: corresponding 1389 ℃ of 1000Hz, corresponding 1407 ℃ of 1100Hz, corresponding 1484 ℃ of 1200Hz, corresponding 1574 ℃ of 1300Hz; The heating frequency with the corresponding relation of heating-up time is: the corresponding 50s of 1100Hz, the corresponding 250s of 1200Hz, the corresponding 600s of 1300Hz.Therefore it is higher to heat frequency, and corresponding heating-up temperature is higher, and intensification is that the time is longer.In addition, because the solid-liquid phase line temperature of different-alloy is different, can select suitable heating frequency according to the corresponding relation of heating frequency and temperature, thereby make the fully fusing under corresponding heating frequency of different alloys.
Move speed not simultaneously on thermopair, the degree of accuracy of the temperature value that recording instrument without paper gathers is different.The heating frequency is moved speed when being 1100Hz on the impact of the degree of accuracy of temperature value as shown in Figure 3 on the thermopair, because not the same reference position difference of moving the thermopair under the speed, therefore not the same during arbitrary distance (" distance " refers to the thermometric end of thermopair and the distance of the reference position of thermopair herein) among Fig. 3 to move temperature value corresponding to speed different, but this does not affect the speed of moving to the impact of temperature degree of accuracy.As seen from the figure, on the speed of moving when being 40 μ m/s, the data of collection are not steady, it is larger to fluctuate; When on the speed of moving when being 8 μ m/s or 4 μ m/s, the data of collection are more steady, it is less to fluctuate.The fluctuation of curve is to be determined by the degree of accuracy of recording instrument without paper collecting temperature value, on move speed when larger, the temperature data points interval of collection is larger, thereby the temperature difference of adjacent collection point is larger, data fluctuations is larger, the degree of accuracy of temperature reduces.Therefore in the continuous temperature measurement process, should adopt the low speed of moving to improve the degree of accuracy of data with this, yet on the speed of moving not be the smaller the better, in the degree of accuracy (when the speed of moving is 8 μ m/s or 4 μ m/s) of temperature all in the higher situation, if adopt 4 μ m/s on move speed, the required Measuring Time of whole measuring process is longer, operating process is more time-consuming, so also should not select in the thermometric process to move speed on less.
Fig. 4 is the DTA heating curve of SRR99 alloy.Liquidus curve and the solidus temperature interval of SRR99 alloy are 1332-1383 ℃ as can be known by the DTA heating curve of SRR99 alloy.
SRR99 alloy solid-liquid interface temperature gradient under the different heating frequency as shown in Figure 5, the speed of moving on the thermopair is little on the impact of temperature gradient of solid-liquid interface, however the magnetic field heating frequency obviously affects thermograde.The heating frequency with the corresponding relation of thermograde is: the corresponding 123K/cm of 1100Hz, and the corresponding 169K/cm of 1200Hz, the corresponding 240K/cm of 1300Hz, so the magnetic field heating frequency is larger, the thermograde of solid-liquid interface is larger.The computing method of thermograde are as follows: at first, change into temperature with the change curve of distance according to moving the temperature of speed with the recording instrument without paper collection on the thermopair with variation constantly; Secondly, at the liquidus curve of SRR99 alloy and the slope of solidus temperature interval (1332-1383 ℃), this slope is the thermograde at SRR99 alloy solid-liquid interface to accounting temperature, also is the thermograde of this directional solidification furnace with the change curve of distance.
To the computing method of the continuous temperature measurement of high speed water-cooled directional solidification furnace and liquid metal cooling directional solidification furnace and thermograde with top identical.Because the heating space of these two kinds of bodies of heater is larger, may have body of heater temperature field surrounding situation pockety, the temperature field of adopting this utility model also can measure one week of body of heater distributes.At first, built-in a plurality of identical single hole ceramic pipe in advance around the formwork inserts a diplopore ceramic pipe that comprises thermopair in each single hole ceramic pipe, make all thermopair low sides be in identical horizontal level (starting altitude that guarantees measurement point is identical); Secondly, all diplopore ceramic pipes are fixed in upper jacking system (guarantee all thermopairs on to move speed identical); At last, all thermopairs are external in recording instrument without paper.Temp measuring method such as top identical.
Embodiment result shows, adopt the utility model to the nickel base superalloy melt continuous temperature measurement in the directional solidification furnace, under thermopair and the discontiguous condition of alloy melt, the continuous temperature that can repeatedly measure under the different curing conditions changes and corresponding thermograde.
Claims (9)
1. directional solidification process continuous thermometering device is characterized in that this continuous thermometering device comprises: recording instrument without paper, formwork, single hole ceramic pipe, diplopore ceramic pipe, platinum rhodium thermocouple, and concrete structure is as follows:
Diplopore ceramic pipe arranged outside single hole ceramic pipe, leave the space between diplopore ceramic pipe and the single hole ceramic pipe, arranged outside formwork at the single hole ceramic pipe, the diplopore ceramic pipe is installed on the jacking system bottom, the built-in platinum rhodium thermocouple of diplopore ceramic pipe, the thermometric end of platinum rhodium thermocouple extends the bottom of single hole ceramic pipe, and the other end of platinum rhodium thermocouple is connected with the input end of recording instrument without paper.
2. according to directional solidification process continuous thermometering device claimed in claim 1, it is characterized in that the solid phase alloy is positioned between single hole ceramic pipe and the formwork.
3. according to directional solidification process continuous thermometering device claimed in claim 1, it is characterized in that, the outside of formwork is provided with: formwork clamping bar, graphite annulus, formwork is by the clamping of formwork clamping bar, the arranged outside induction copper band of graphite annulus, be used for realization to the induction heating of solid phase alloy, form the alloy melting zone, solidifying between the part that alloy melting zone and alloy melting zone are following forms solid-liquid interface.
4. according to directional solidification process continuous thermometering device claimed in claim 3, it is characterized in that, in the bottom of induction copper band, graphite annulus crucible is set, separate by thermal baffle between graphite annulus and the crucible, be liquid metal in the crucible, the bottom of formwork extends in the liquid metal.
5. according to directional solidification process continuous thermometering device claimed in claim 4, it is characterized in that the bottom of crucible is lower jacking system.
6. according to directional solidification process continuous thermometering device claimed in claim 1, it is characterized in that, single hole ceramic pipe built-in equal height and bottom end seal in formwork, the single hole ceramic pipe maintains static in formwork and is parallel to the thermograde direction, and the alloy melt in platinum rhodium thermocouple and the formwork is by the isolation of single hole ceramic pipe.
7. according to directional solidification process continuous thermometering device claimed in claim 1, it is characterized in that, insert in the diplopore ceramic pipe of both ends open at the two poles of the earth of platinum rhodium thermocouple, and the bottom of diplopore ceramic pipe contacts with single hole ceramic pipe bottom, and diplopore ceramic pipe height is more than the formwork height.
8. according to directional solidification process continuous thermometering device claimed in claim 7, it is characterized in that: the length of diplopore ceramic pipe is 1-5 times of formwork height.
9. according to directional solidification process continuous thermometering device claimed in claim 1, it is characterized in that: the directional solidification furnace of being measured by continuous thermometering device comprises high speed water-cooled directional solidification furnace, liquid metal cooling directional solidification furnace or zone melting liquid metal cooling directional solidification furnace.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201220350902.4U CN202710199U (en) | 2012-07-19 | 2012-07-19 | Continuous temperature measuring device in directional solidification process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201220350902.4U CN202710199U (en) | 2012-07-19 | 2012-07-19 | Continuous temperature measuring device in directional solidification process |
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| CN201220350902.4U Expired - Fee Related CN202710199U (en) | 2012-07-19 | 2012-07-19 | Continuous temperature measuring device in directional solidification process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404622A (en) * | 2014-11-26 | 2015-03-11 | 中国电子科技集团公司第十三研究所 | Thermocouple lifting device for indium phosphide single-crystal furnace |
| CN112048605A (en) * | 2020-08-03 | 2020-12-08 | 西北工业大学 | Directional annealing device and method for preparing metal columnar crystals |
| CN113447153A (en) * | 2021-06-28 | 2021-09-28 | 哈尔滨工业大学 | Temperature measuring device and measuring method in directional solidification process of cold crucible |
| CN118080790A (en) * | 2024-04-29 | 2024-05-28 | 江苏永瀚特种合金技术股份有限公司 | Mould for monitoring temperature field change of heater of monocrystalline directional mould shell |
-
2012
- 2012-07-19 CN CN201220350902.4U patent/CN202710199U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404622A (en) * | 2014-11-26 | 2015-03-11 | 中国电子科技集团公司第十三研究所 | Thermocouple lifting device for indium phosphide single-crystal furnace |
| CN112048605A (en) * | 2020-08-03 | 2020-12-08 | 西北工业大学 | Directional annealing device and method for preparing metal columnar crystals |
| CN113447153A (en) * | 2021-06-28 | 2021-09-28 | 哈尔滨工业大学 | Temperature measuring device and measuring method in directional solidification process of cold crucible |
| CN113447153B (en) * | 2021-06-28 | 2024-04-19 | 哈尔滨工业大学 | Temperature measuring device and method in directional solidification process of cold crucible |
| CN118080790A (en) * | 2024-04-29 | 2024-05-28 | 江苏永瀚特种合金技术股份有限公司 | Mould for monitoring temperature field change of heater of monocrystalline directional mould shell |
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