CN201182017Y - Induction heater used for high-temperature gradient directional solidification - Google Patents
Induction heater used for high-temperature gradient directional solidification Download PDFInfo
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- CN201182017Y CN201182017Y CNU2008200288748U CN200820028874U CN201182017Y CN 201182017 Y CN201182017 Y CN 201182017Y CN U2008200288748 U CNU2008200288748 U CN U2008200288748U CN 200820028874 U CN200820028874 U CN 200820028874U CN 201182017 Y CN201182017 Y CN 201182017Y
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- heater
- frequency induction
- induction coil
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- directional solidification
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Abstract
The utility model relates to an induction heater used for high-temperature gradient directional solidification, which comprises a high-frequency induction coil (7) and a graphite heating element (1), wherein, the high-frequency induction coil (7) and the graphite heating element (1) are tapered; the end socket of the small diameter end of the graphite heating element is provided with a straight tube; the small diameter end of the graphite heating element is arranged on a radiation baffle (3); a crucible (6) penetrating through the middle hole of the radiation baffle is connected with a pulling system (9); the high-frequency induction coil (7) is sleeved outside the graphite heating element (1), and is connected with a high-frequency induction power supply (10). The melting interface of a sample is intensively heated by the small diameter end of the graphite heating element (1) and excess heat is limited in a smaller region at the front edge of the interface, so the corundum crucible can not be damaged caused by long-time heating in the process of directional solidification, the distance between the highest temperature region and the solidification interface is shortened, and the temperature gradient of the front edge of a solid-liquid interface is increased. Therefore, the tissue of materials is improved, and the combination property of materials is increased. Moreover, the utility model is suitable for large-sized directional solidification samples.
Description
One, technical field
The present invention relates to the acquisition technology of directional solidification high-temperature gradient, specifically is a kind of induction heater that is used for high-temperature gradient directional solidification.
Two, background technology
The development of aero gas turbine engine depends on the development of high temperature alloy always, and the application of directional solidification technique is a milestone in the high temperature alloy evolution, and it makes the manufacturing technology of high temperature alloy enter new period.Adopt the prepared high temperature alloy gas turbine engine blade that goes out of directional technology with column and even single crystal organization, have good thermal shock resistance, long fatigue behaviour, higher creep resistance and middle temperature plasticity, thereby improved the useful life and the serviceability temperature of blade.In the directional solidification process, the temperature gradient of forward position, freezing interface liquid phase and freezing rate are the important parameters of decision solidified structure form.By improving temperature gradient, can improve freezing rate on the one hand, can obtain on the other hand longer, the exemplar of arborescent structure marshalling.The development of directional solidification technique is a main target to improve the freezing interface temp gradient at front edge all.By forcing the heating and cooling condition, obtain high temperature gradient, thereby make the directed tissue refinement of exemplar, the component segregation degree reduces, and growth defect obviously reduces, and combination property is improved, and simultaneously, has improved production efficiency, reduces production costs.
Heating condition in the directional solidification technique is a very crucial part, and its mode of heating has the mode of heating or the graphite resistance mode of heating of electromagnetic induction and heater combination usually.Because graphite has good thermal conductivity, conductivity and magnetic conduction not, so it is the heater of good directional solidification.At present, industrial common employing graphite heating method is produced high-temperature alloy blades.Graphite resistance heating and graphite induction heating dual mode are arranged in the graphite heating method, wherein graphite resistance heating temperature control is easy, melt heating is not disturbed by or not the outfield, directed tissue growth is stable, but components mechanism complexity, the fault of graphite resistance heating are many, the difficult maintenance, and heating-cooling speed is very slow, has prolonged the production cycle.The graphite induction heating, heating-cooling speed is fast, heater has greatly shielded the stirring of electromagnetic field to liquid phase, directed tissue growth is stable, but industrially adopt solid/liquid interfaces temp gradient at front edge that the graphite heating method obtained usually less than 100K/cm at present, this makes material structure thick, and component segregation is serious, defective is more, greatly reduces the mechanical property of exemplar.
Existing graphite heating device for directionally solidifying is researched and analysed discovery, its calandria all adopts straight barrel shape substantially, make the highest overheated temperature province of graphite heater be in the medium position of heater, increase the highest overheated temperature level like this and put distance with the freezing interface, thereby reduced temperature gradient.
Northwestern Polytechnical University has proposed a kind of composite induction heating apparatus of high-temperature gradient directional solidification in application number is 200710017592.8 application for a patent for invention, the heater of this composite induction heating apparatus is made of liner and high frequency coil, liner is welded in high frequency coil one end for concentrating the thermal treatment zone, the end-coil formation preheats the district on the liner, and on both are integrated in one, form the composite sensing heater, and directly assemble sample in this composite sensing heater, the eddy current of radio-frequency induction coil induction directly acted on the sample heat, and the concentrated thermal treatment zone concentrates heating to improve temperature gradient to fusing at the interface, it is fast to have firing rate, the advantage that temperature gradient is high.But this heater also makes sample be subjected to the effect of electromagnetic stirring force in heating sample, and the oriented growth of sample tissue is affected, and is particularly evident in large dimension specimen.So the heater that this device adopted can only be used for preparation small size sample under the laboratory condition.
Three, summary of the invention
Low in order to overcome present graphite heating device for directionally solidifying temperature gradient, the deficiency that the exemplar mechanical property of production is restricted the present invention proposes a kind of induction heater that is used for high-temperature gradient directional solidification.
The present invention includes the loam cake of radio-frequency induction coil, heater and heater, be arranged in body of heater jointly with pull system, crystallizer, radio-frequency induction coil and crucible.Radiation baffle is positioned on the crystallizer, and crucible passes the mesopore of radiation baffle, and system is connected with pull; Radio-frequency induction coil is enclosed within outside the heater, is connected with high frequency electric source.The invention is characterized in that the internal diameter difference of the every circle of radio-frequency induction coil forms the taper by the multiturn coil coiled; The profile of heater and inner chamber also are and the corresponding taper of radio-frequency induction coil, and are straight tube in the end of heater smaller diameter end; The heater loam cake is positioned at the big end of heater.
The wall thickness of graphite heater housing is a uniform thickness, and this wall thickness should be greater than the penetration depth of high-frequency current.The internal diameter of graphite heater taper smaller diameter end is a bit larger tham the crucible external diameter, and the external diameter of smaller diameter end is its internal diameter and twice wall thickness value sum.The internal diameter of larger diameter end is greater than the smaller diameter end internal diameter, and the preheat temperature that will reach according to test specimen and the heating power of high frequency induction power supply come value.The larger diameter end external diameter is its internal diameter and twice wall thickness value sum.The graphite heater height determines that according to specimen length half is in the graphite heater to make sample at least.The graphite heater top adds loam cake to reduce the heat dissipation of heating sample.The internal diameter of loam cake is identical with the graphite heater minimum diameter.
Radio-frequency induction coil is the taper of multiturn, and is gapped between every circle, and its total height is a little less than the graphite heater height.
Radio-frequency induction coil inner surface and heating graphite external surface have certain clearance, and the span in its gap is 1.5～6mm, when the heating graphite body diameter when ф 30mm is following, adopt the gap of 1.5～2.5mm; When the heating graphite body diameter when ф 30mm is above, adopt 2.5～6mm gap.Because this coil is taper, so the gap width of radio-frequency induction coil inner surface and heating graphite external surface increases gradually along with the increase of tapered diameter.The internal diameter of radio-frequency induction coil is heating graphite body diameter and this gap width sum.
The present invention carries out induction heating to the heater in induction coil after induction coil is inserted high-frequency ac current, the heater after the heating by thermal radiation with the heat transferred sample to finish heating.By the heater small end sample fusing is concentrated at the interface and to strengthen heating, and with the overheated less zone, forward position, interface that is confined to, make in the directional solidification process corundum crucible can be because of overheated damage for a long time.Shortened the distance of highest temperature region and freezing interface, the temperature gradient in solid/liquid interfaces forward position has been improved, thereby improves material structure, improved the material combination property, and be applicable to industrial large-sized directional solidification sample.
Four, description of drawings
The induction heater of high-temperature gradient directional solidification
Fig. 1 is a kind of device for directionally solidifying structural representation that uses the high-temperature gradient directional solidification induction heater.
Fig. 2 is the structural representation that is used for the induction heater of high-temperature gradient directional solidification.
Fig. 3 is the heating element structure schematic diagram.
Fig. 4 is the radio-frequency induction coil structural representation.
Fig. 5 is the structural representation of execution mode.Among the figure:
1. heater 2. bodies of heater 3. radiation baffles 4. crystallizers 5. loam cakes 6. crucibles 7. radio-frequency induction coils 8. vacuum systems 9. pull systems 10. high frequency induction power supplies
Five, embodiment
Present embodiment comprises body of heater 1, pull system 9, crystallizer 4, crucible 6 and graphite induction heater, and specimen length is 80mm; The height of heater 1 is 50mm, and wall thickness is 11mm, and wall thickness is greater than the penetration depth of high-frequency current; Crucible 6 external diameters are 8mm; The frequency of power supply high frequency induction power supply 10 is 25kHz.
Graphite induction heater comprises the heater 1 that radio-frequency induction coil 7, graphite are made and the loam cake 5 of heater.Heater 1 is made the taper of hollow, radio-frequency induction coil 7 also is corresponding taper, and heater 1 is positioned at radio-frequency induction coil 7, smaller diameter end by radio-frequency induction coil 7 is concentrated induction heating to the smaller diameter end of heater 1, and the smaller diameter end of heater 1 concentrates radiation to strengthen heating to crucible 6 again; The larger diameter end of radio-frequency induction coil 7 larger diameter end and heater 1 preheats crucible 6; Loam cake 5 is positioned at heater 1 larger diameter end.
The high-purity high-quality graphite of graphite heater 1 usefulness is made, lower wall thickness unanimity on it.Being a bit larger tham the penetration depth δ of high-frequency current according to the wall thickness of graphite heater, is 11mm so get the wall thickness of graphite heater 1.By crucible 6 external diameters is 8mm, and the internal diameter of getting graphite heater 1 smaller diameter end is 10mm, and external diameter is 32mm, and the small end termination be highly for 10mm etc. straight the tube.Graphite heater 1 larger diameter end internal diameter is 20mm, and external diameter is 42mm.Specimen length is 80mm, and the height of graphite heater 1 is 50mm.The material of graphite heater loam cake 5 is identical with the material of graphite heater 1, and it highly is 10mm, and the internal diameter of loam cake is identical with the internal diameter of graphite heater smaller diameter end, and external diameter is with the external diameter of graphite heater larger diameter end.
Radio-frequency induction coil 7 used copper tubes are of a size of ф 4 * 1mm.The gap of radio-frequency induction coil 7 every turn-to-turns is 3mm, and its total height is 42mm, a little less than the graphite heater height; The number of turn is got 5 circles according to power supply coupling and coil total height.Radio-frequency induction coil inner surface and heating graphite external surface have certain clearance, and the span in its gap is 1.5～6mm, when the heating graphite body diameter when ф 30mm is following, adopt the gap of 1.5～2.5mm; When ф 30mm is above, adopt 2.5～6mm gap.When determining the internal diameter of radio-frequency induction coil, need the gap between consideration radio-frequency induction coil inner surface and the heating graphite external surface, in the present embodiment, the external diameter of graphite heater 1 larger diameter end is 42mm, and the gap width of the outer surface at this place and radio-frequency induction coil inner surface is got 6mm; The external diameter of smaller diameter end is 32mm, and the gap width of the outer surface at this place and radio-frequency induction coil inner surface is got 1.5mm.In the present embodiment, the maximum inner diameter of radio-frequency induction coil is 54mm, and minimum diameter is 35mm; Be positioned at three middle circle coils of maximum gauge and minimum diameter and get median respectively, so begin to be followed successively by 40mm, 45mm, 50mm from smaller diameter end.
During installation, graphite induction heater and pull system 9, crystallizer 4, crucible 6 are arranged in body of heater 2 jointly, and the centre bore that crucible 6 one ends pass radiation baffle 3 places in the crystallizer 4, is connected with pull system 9, and the other end is positioned at the center of heater 1.The two ends of radio-frequency induction coil 7 are connected with high frequency induction power supply 10 respectively.The smaller diameter end of taper heater 1 contacts with radiation baffle 3; The loam cake 5 of heater is positioned at the larger diameter end of heater.
The present invention turns to radio-frequency induction coil 7 and heater 1 corresponding taper, by the smaller diameter end of radio-frequency induction coil 7 small end of heater 1 is strengthened heating, and the larger diameter end part preheats the big end of heater.Tube straight such as one section grade is arranged at the smaller diameter end place of heater 1, can strengthen heating to sample, make highest temperature region be near the smaller diameter end of heater 1, reduced the distance with the freezing interface, improved temperature gradient by this section; The larger diameter end of heater 1 is carried out preheating and fusing to sample, makes sample also can obtain enough superheating ratios under higher drawing velocity.
Claims (5)
1. induction heater that is used for high-temperature gradient directional solidification, the loam cake that comprises radio-frequency induction coil (7), heater (1) and heater (1), be arranged in body of heater (2) jointly with pull system (9), crystallizer (4) and crucible (6), radiation baffle (3) is positioned on the crystallizer (4), crucible (6) one ends pass the hole that is positioned at radiation baffle (3) center, be connected with pull system (9), the other end places in the heater (1); Radio-frequency induction coil (7) is enclosed within outside the heater (1), is connected with high frequency induction power supply (10), it is characterized in that the internal diameter difference of the every circle of radio-frequency induction coil (7), forms the taper by the multiturn coil coiled; The profile of heater (1) and inner chamber also be and the corresponding taper of radio-frequency induction coil (7), and be straight in the end of heater (1) smaller diameter end; Heater loam cake (5) is positioned at the larger diameter end of heater.
2. a kind of according to claim 1 induction heater that is used for high-temperature gradient directional solidification is characterized in that the external diameter of the internal diameter of described taper heater (1) smaller diameter end greater than crucible (6).
3. a kind of according to claim 1 induction heater that is used for high-temperature gradient directional solidification is characterized in that the gap between described taper radio-frequency induction coil (7) and the heater (1) is 1.5～6mm, and increases along with the increase of tapered diameter.
4. a kind of according to claim 1 induction heater that is used for high-temperature gradient directional solidification is characterized in that the smaller diameter end of radio-frequency induction coil (7) and heater (1) places on the radiation baffle (3).
5. as a kind of induction heater that is used for high-temperature gradient directional solidification as described in the claim 3, it is characterized in that when heater (1) external diameter when 30mm is following, the gap between radio-frequency induction coil (7) inner surface and heater (1) outer surface is 1.5～2.5mm; When heater (1) external diameter when 30mm is above, the gap between radio-frequency induction coil (7) inner surface and heater (1) outer surface is 2.5～6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200288748U CN201182017Y (en) | 2008-04-17 | 2008-04-17 | Induction heater used for high-temperature gradient directional solidification |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200288748U CN201182017Y (en) | 2008-04-17 | 2008-04-17 | Induction heater used for high-temperature gradient directional solidification |
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| CN201182017Y true CN201182017Y (en) | 2009-01-14 |
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| CNU2008200288748U Expired - Fee Related CN201182017Y (en) | 2008-04-17 | 2008-04-17 | Induction heater used for high-temperature gradient directional solidification |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102343432A (en) * | 2010-07-30 | 2012-02-08 | 中国科学院金属研究所 | Thermal resistance structure assisted water cooling crystallizer directional solidification device |
| CN111230077A (en) * | 2020-03-09 | 2020-06-05 | 西北工业大学 | Wide speed-regulating directional solidification device for high-temperature alloy |
| CN113639557A (en) * | 2021-07-21 | 2021-11-12 | 西安石油大学 | Crucible of alumina-based eutectic ceramic part for directional solidification aeroengine |
-
2008
- 2008-04-17 CN CNU2008200288748U patent/CN201182017Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102343432A (en) * | 2010-07-30 | 2012-02-08 | 中国科学院金属研究所 | Thermal resistance structure assisted water cooling crystallizer directional solidification device |
| CN102343432B (en) * | 2010-07-30 | 2013-03-27 | 中国科学院金属研究所 | Thermal resistance structure assisted water cooling crystallizer directional solidification device |
| CN111230077A (en) * | 2020-03-09 | 2020-06-05 | 西北工业大学 | Wide speed-regulating directional solidification device for high-temperature alloy |
| CN113639557A (en) * | 2021-07-21 | 2021-11-12 | 西安石油大学 | Crucible of alumina-based eutectic ceramic part for directional solidification aeroengine |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090114 Termination date: 20110417 |