CN202347126U - Double-crucible induction heating furnace - Google Patents
Double-crucible induction heating furnace Download PDFInfo
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- CN202347126U CN202347126U CN2011203914887U CN201120391488U CN202347126U CN 202347126 U CN202347126 U CN 202347126U CN 2011203914887 U CN2011203914887 U CN 2011203914887U CN 201120391488 U CN201120391488 U CN 201120391488U CN 202347126 U CN202347126 U CN 202347126U
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Abstract
The utility model relates to a double-crucible induction heating furnace which comprises a tubby heat preservation body with an open top, wherein the heat preservation body is internally provided with a refractory material and an induction coil; a crucible support frame is supported at the center of the tubby heat preservation body; a crucible with an opening at the top is placed on the crucible support frame; the crucible comprises an outer crucible which has electric conductivity and high temperature resistance and an inner crucible which has high temperature resistance; the inner crucible is located in the outer crucible; center lines of the inner and outer crucibles are located on a same straight line with a center line of the heating furnace; and the gap between the inner and outer crucibles is 1-20mm. The heating furnace uses the inner and outer crucibles to separate a heater and a raw material container, so that the problems that the crucibles made of precious metals such as iridium, platinum and the like are easy to perforate in the high-temperature induction melting process and the crucibles made of common tungsten, molybdenum and the like pollute the raw materials in the induction heating melting process are solved, and the qualified rate of the products is greatly improved.
Description
Technical field
The utility model relates to a kind of high melt device, particularly a kind of pair of crucible induction heater.
Background technology
Induction heating melting technology is widely used in various crystal growths and Metal smelting process, and it utilizes electromagnetic induction effect that the crucible of electroconductibility is heated, and makes that the raw material in the crucible melts, and control cooling then realizes crystal growth or Metal smelting.
Traditional induction heater has only a crucible, and crucible is the container of raw material, is again the calorifier of equipment; In heating melting production process, though the variation of mean power is that momentary power constantly fluctuates smoothly slowly; Accordingly, crucible temperature also can be along with fluctuation of power, simultaneously; The electromagnetic induction line mainly concentrates on the crucible outside surface, and it is thermoae inhomogeneous to make that the crucible surfaces externally and internally receives, and very easily causes the perforation of crucible to be lost efficacy; Typical example is exactly that Iridium Crucible is bored a hole when the induction heating growing sapphire crystal easily, thereby causes the sapphire crystal growth failure.In addition, in crystal growth and Metal smelting field, often adopt the crucible of materials such as tungsten, molybdenum; Because its fusing point is high especially, is difficult for melting, often makes with ceramic sintering process; Such crucible very easily produces under the condition of induction heating and peels off; Crucible material is incoming stock to be polluted it, and in crystal or metal (alloy), forms inclusion, thereby causes product quality to reduce greatly even scrap.
Summary of the invention
To the problems referred to above, the utility model provides a kind of pair of crucible induction heater.This process furnace adopts inside and outside two crucibles, and calorifier and material container are separated.The utility model solved in the high temperature induction melting process noble metal crucibles such as iridium, platinum easily perforation and crucibles such as common tungsten, molybdenum in induction heating melting process to the pollution problem of raw material, greatly improve the qualification rate of product.
The technical scheme of the utility model is:
Two crucible induction heaters; Comprise tubbiness thermal insulator with open top; Be provided with refractory materials and ruhmkorff coil in the thermal insulator, the crucible bracing frame is supported on tubbiness thermal insulator center, and the top has open crucible and is placed on the crucible bracing frame; Said crucible comprises having electroconductibility and resistant to elevated temperatures outer crucible and the interior crucible with high thermal resistance; Said in crucible be positioned at outer crucible, the medullary ray of inside and outside crucible and the medullary ray of process furnace point-blank, the gap between interior crucible wall and the outer crucible sidewall is 1～20mm.
The fusing point of said inside and outside crucible is than by melting raw material Rong Dian ≧ 100 ℃.
The wall thickness of crucible is 3 ~ 20mm in said, and the wall thickness of outer crucible is 2 ~ 20mm.
The height of said outer crucible is greater than or equal to interior crucible.
The height of said outer crucible is less than interior crucible.
Said outer crucible adopts conduction and resistant to elevated temperatures tungsten or molybdenum or iridium or platinum or materials such as platinum rhodium or graphite.
Crucible adopts tungsten or molybdenum or iridium or platinum or the platinum rhodium or the materials such as graphite or zirconium white or aluminum oxide of resistant to elevated temperatures metal or alloy or pottery in said.
The utility model adopts inside and outside two crucibles to apply mechanically, and interior crucible is as the container that holds raw material, and outer crucible generates heat under the effect of electromagnetic induction, thus melt raw material and the certain temperature of maintenance in the process of crystal growth or Metal Melting.Outer crucible does not directly contact with raw material, can avoid crucible to peel off the pollution to product.
Because induction heating is to utilize electromagnetic induction principle; Be placed on conducting material in the alternating magnetic field; Make its inner inductive current that produces, thereby produce the method for joule heating heating, therefore; The interior crucible of process furnace be placed in the outer crucible and the medullary ray of the medullary ray of crucible and process furnace point-blank, can obtain centrosymmetric temperature distribution (thermograde).
Owing to have only the material of electroconductibility just can receive the effect heating of electromagnetic induction; Therefore, the outer crucible material must be conducted electricity, simultaneously; Inside and outside crucible works long hours under hot conditions; Good high-temperature stability must be arranged, and common high temperature resistant material comprises tungsten, molybdenum, iridium, platinum, platinum rhodium, zirconium white, aluminum oxide (being commonly called as corundum), graphite etc., its fusing point such as following table:
| The material title | Tungsten | Molybdenum | Iridium | Platinum | The platinum rhodium | Zirconium white | Aluminum oxide | Graphite |
| Fusing point ℃ | 3422 | 2623 | 2466 | 1768 | 1600 | 2715 | 2054 | 3652 |
Inside and outside crucible fusing point all must be higher than by 100 ℃ of the fusing points of melting raw material; Because the heating system of induction heating has determined that temperature reduces from outside to inside gradually in the stove; That is, the temperature at inside and outside sidewall of crucible place is higher, and the material temperature of (especially crucible center) is lower in the crucible; Therefore, if inside and outside crucible fusing point too very easily bore a hole near the raw material fusing point.
Conductor is accepted electromagnetic induction and converts the speed of heat into very fast; Keep certain clearance between the inside and outside sidewall of crucible; Fill protective gas in the gap or keep vacuum; Because the thermal conductivity of gas or vacuum is very poor, can cushion outer crucible with the temperature fluctuation speed that fluctuation of power causes, help the stability that holding temperature distributes like this.Gap length can be regulated the emergency of heat conduction velocity, is generally 1-20mm and is advisable.Equally, also can regulate heat conducting emergency, but for convenience, interior crucible is placed directly in generally above the outer crucible bottom through the size that changes inside and outside crucible bottom gap.
Interior crucible thickness is 3-20mm, just selects according to raw material what and use temperature, makes it have enough physical strengths.
The outer crucible wall thickness is 2-20mm, and its reason is: the one, and the electromagnetic induction depth of interaction, another is enough physical strengths.The electromagnetic induction depth of interaction depends on frequency, heating element relative magnetic permeability and the resistivity of induction heating power.The blocked up not only heaviness of outer crucible wall thickness but also influence thermal conduction effect is crossed and thinly can not fully be accepted the electromagnetic induction heating, does not have enough physical strengths again.
The outer crucible height is not less than 1/4th of interior crucible height, makes outer crucible can fully accept the electromagnetic induction heating, can realize the adjusting of thermograde again through the height that changes calorifier.
The Working environment of crucible is under protective atmosphere or vacuum environment, otherwise oxidation easily.
Description of drawings
Fig. 1 is the structure diagram of two crucible induction heaters;
Fig. 2 is the structural representation of two crucibles.
Among the figure, 1 is lifting rod, and 2 is seed crystal, and 3 is thermal insulator, and 4 is outer crucible, and 5 is interior crucible, and 6 is ruhmkorff coil, and 7 is raw material, and 8 is the crucible bracing frame.
Embodiment
Referring to Fig. 1; Two crucible induction heaters; Comprise the tubbiness thermal insulator 3 with open top, be provided with refractory materials and ruhmkorff coil 6 in the thermal insulator, crucible bracing frame 8 is supported on tubbiness thermal insulator center; The top has open crucible and is placed on the crucible bracing frame; Said crucible comprises having electroconductibility and resistant to elevated temperatures outer crucible 4 and the interior crucible 5 with high thermal resistance, and outer crucible adopts conduction and resistant to elevated temperatures tungsten or molybdenum or iridium or platinum or materials such as platinum rhodium or graphite, and said interior crucible adopts tungsten or molybdenum or iridium or platinum or the platinum rhodium or the materials such as graphite or zirconium white or aluminum oxide of resistant to elevated temperatures metal or alloy or pottery.The wall thickness of crucible is 3 ~ 20mm in said; The wall thickness of outer crucible is 2 ~ 20mm; Crucible has enough physical strengths in making; Simultaneously, the outer crucible wall not because of blocked up and heavy with influence thermal conduction effect, can not fully not accept electromagnetic induction because wall thickness crosses thin yet and generate heat and do not have enough physical strengths.Crucible is positioned at outer crucible in said; The medullary ray of inside and outside crucible and the medullary ray of process furnace are point-blank; The height of said outer crucible is greater than or equal to interior crucible, and perhaps the height of outer crucible is less than interior crucible, and the outer crucible height is not less than 1/4th of interior crucible height; Make outer crucible can fully accept the electromagnetic induction heating, simultaneously interior crucible can be realized the adjusting of thermograde through the height that changes calorifier.Gap L (see figure 2) between interior crucible wall and the outer crucible sidewall is 1～20mm, is used to regulate the emergency of heat conduction velocity.The fusing point of said inside and outside crucible avoids inside and outside crucible in the process of melting raw material, to bore a hole than by melting raw material fusing point >=100 ℃.
Embodiment 1: apply mechanically growing sapphire crystal (with reference to figure 1) with tungsten crucible and iridium crucible.
As outer crucible 4, iridium crucible is as interior crucible 5 with tungsten crucible.To clean good outer crucible 4 earlier puts on the crucible bracing frame 8 of Medium Frequency Induction Heating Furnace; To clean good interior crucible 5 then and put into outer crucible 4; The medullary ray of two crucible medullary rays and process furnace point-blank, the gap 1-15mm between the sidewall of crucible, outer crucible 4 is highly consistent with interior crucible 5; Outer crucible 4 wall thickness 5-10mm, interior crucible 5 wall thickness 3-8mm.
The aluminium sesquioxide raw material 7 of 30kg cleaning is put into crucible 5, sapphire seed crystal 2 is installed to also adjustment is well vertical on the lifting rod 1, at last stove is built sealing.
The open vacuum pump is taken furnace air away, when vacuum reaches 10pa when following; Close vacuum pump; In stove, feed argon gas then furnace pressure is reached a little more than barometric point, the vent valve that keeps feeding argon gas and suitably open furnace roof guarantees that stove inside remains pressure-fired with respect to atmosphere.
Open heating power supply, heat up up to raw material 7 fusings (about 2054 ℃), the adjustment temperature neither is melted also when seed crystal 2 contacts with bath surface does not grow up rapidly---reach the solid-liquid equilibrium temperature spot.Begin slowly to lift seed crystal 1 then and raw material is slowly lowered the temperature.
When jewel weight grows into the 23kg left and right sides, jewel is lifted out liquid level fast, begin cooling annealing cooling, after ruhmkorff coil 6 power drop to 0, close heating power supply, treat that stove inside naturally cools to room temperature after, sapphire crystal is taken out in blow-on.
Embodiment 2: apply mechanically growth cholic acid crystalline lithium (with reference to figure 1) with plumbago crucible and platinum-rhodium crucible.
As outer crucible 4, platinum-rhodium crucible is as interior crucible 5 with plumbago crucible.Process like embodiment 1 installs inside and outside crucible, the gap 1-10mm between two sidewall of crucible, and outer crucible 4 highly is 1/2nd of an interior crucible 5, outer crucible 4 wall thickness 2-10mm, interior crucible 5 wall thickness 3-10mm.
The cholic acid lithium raw material 7 of 10kg cleaning is put into crucible 5, cholic acid lithium seed crystal 2 is installed to also adjustment is well vertical on the lifting rod 1, at last stove is built sealing.
Extract furnace air out like the process of embodiment 1, fill argon gas then, let remain pressure-fired in the stove.
Open heating power supply, heat up up to raw material 7 fusings (about 1650 ℃), the adjustment temperature neither is melted also when seed crystal 2 contacts with bath surface does not grow up rapidly---reach the solid-liquid equilibrium temperature spot.Begin slowly to lift seed crystal 2 then and raw material is slowly lowered the temperature.
When crystal weight grows into the 8kg left and right sides, jewel is lifted out liquid level fast, begin cooling annealing cooling, after ruhmkorff coil 6 power drop to 0, close heating power supply, treat that stove inside naturally cools to room temperature after, the cholic acid crystalline lithium is taken out in blow-on.
Embodiment 3: apply mechanically melting Ni-Ti alloy (with reference to figure 1) with molybdenum crucible and corundum crucible.
As outer crucible 4, corundum crucible is as interior crucible 5 with molybdenum crucible.Process like embodiment 1 installs inside and outside crucible, the gap 5-15mm between two sidewall of crucible, and outer crucible 4 highly is 1.5 times of interior crucible 5, outer crucible 4 wall thickness 3-6mm, interior crucible 5 wall thickness 3-10mm.
5kg high purity nickel and 5kg high purity titanium mixed put into crucible then, stove is built sealing.Vacuumize and vacuum in the stove is maintained in the 0.01pa.
Open heating power supply and make raw material slowly melt (about 1450 ℃), slowly cooling drops to 0 up to ruhmkorff coil 6 power then, closes heating power supply, treat that stove naturally cools to room temperature after, the Ni-Ti alloy ingot is taken out in blow-on.
Claims (7)
1. two crucible induction heater; Comprise tubbiness thermal insulator with open top; Be provided with refractory materials and ruhmkorff coil in the thermal insulator, the crucible bracing frame is supported on tubbiness thermal insulator center, it is characterized in that: the top has open crucible and is placed on the crucible bracing frame; Said crucible comprises having electroconductibility and resistant to elevated temperatures outer crucible and the interior crucible with high thermal resistance; Said in crucible be positioned at outer crucible, the medullary ray of inside and outside crucible and the medullary ray of process furnace point-blank, the gap between interior crucible wall and the outer crucible sidewall is 1～20mm.
2. according to claim 1 pair of crucible induction heater is characterized in that: the fusing point of said inside and outside crucible is than by melting raw material fusing point >=100 ℃.
3. according to claim 1 pair of crucible induction heater is characterized in that: the wall thickness of crucible is 3 ~ 20mm in said, and the wall thickness of outer crucible is 2 ~ 20mm.
4. according to claim 1 pair of crucible induction heater, it is characterized in that: the height of said outer crucible is greater than or equal to interior crucible.
5. according to claim 1 pair of crucible induction heater, it is characterized in that: the height of said outer crucible is less than interior crucible.
6. according to claim 1 pair of crucible induction heater is characterized in that: said outer crucible adopts conduction and resistant to elevated temperatures tungsten or molybdenum or iridium or platinum or platinum rhodium or graphite material.
7. according to claim 1 pair of crucible induction heater is characterized in that: crucible adopts tungsten or molybdenum or iridium or platinum or platinum rhodium or graphite or the zirconium white or the alumina material of resistant to elevated temperatures metal or alloy or pottery in said.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203914887U CN202347126U (en) | 2011-10-14 | 2011-10-14 | Double-crucible induction heating furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203914887U CN202347126U (en) | 2011-10-14 | 2011-10-14 | Double-crucible induction heating furnace |
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| CN202347126U true CN202347126U (en) | 2012-07-25 |
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| CN2011203914887U Expired - Lifetime CN202347126U (en) | 2011-10-14 | 2011-10-14 | Double-crucible induction heating furnace |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586858A (en) * | 2012-04-01 | 2012-07-18 | 北京华进创威电子有限公司 | Double-crucible device for growing single crystals through induction heating physical vapor phase transfer |
| CN102818454A (en) * | 2012-08-10 | 2012-12-12 | 同济大学 | Composite crucible with advantages of energy saving, low cost and capability of being alloyed |
| CN102901659A (en) * | 2012-09-06 | 2013-01-30 | 中国科学院金属研究所 | Preparation method for metal alloy test rod |
| CN103047860A (en) * | 2011-10-14 | 2013-04-17 | 重庆四联光电科技有限公司 | Double-crucible induction heating furnace |
| CN103673598A (en) * | 2012-09-04 | 2014-03-26 | 三星电机株式会社 | Refractory structure for preparing nickel powder and preparing method of nickel powder |
| CN112281214A (en) * | 2020-10-29 | 2021-01-29 | 山东大学 | Method and device for growing rare earth sesquioxide crystal based on double-crucible method |
| CN113088869A (en) * | 2021-03-31 | 2021-07-09 | 哈尔滨化兴软控科技有限公司 | Preparation method of tantalum carbide sheet |
-
2011
- 2011-10-14 CN CN2011203914887U patent/CN202347126U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047860A (en) * | 2011-10-14 | 2013-04-17 | 重庆四联光电科技有限公司 | Double-crucible induction heating furnace |
| CN102586858A (en) * | 2012-04-01 | 2012-07-18 | 北京华进创威电子有限公司 | Double-crucible device for growing single crystals through induction heating physical vapor phase transfer |
| CN102818454A (en) * | 2012-08-10 | 2012-12-12 | 同济大学 | Composite crucible with advantages of energy saving, low cost and capability of being alloyed |
| CN103673598A (en) * | 2012-09-04 | 2014-03-26 | 三星电机株式会社 | Refractory structure for preparing nickel powder and preparing method of nickel powder |
| CN102901659A (en) * | 2012-09-06 | 2013-01-30 | 中国科学院金属研究所 | Preparation method for metal alloy test rod |
| CN112281214A (en) * | 2020-10-29 | 2021-01-29 | 山东大学 | Method and device for growing rare earth sesquioxide crystal based on double-crucible method |
| CN113088869A (en) * | 2021-03-31 | 2021-07-09 | 哈尔滨化兴软控科技有限公司 | Preparation method of tantalum carbide sheet |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120725 |