CN103556220A - Polycrystalline silicon ingot furnace - Google Patents
Polycrystalline silicon ingot furnace Download PDFInfo
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- CN103556220A CN103556220A CN201310564069.2A CN201310564069A CN103556220A CN 103556220 A CN103556220 A CN 103556220A CN 201310564069 A CN201310564069 A CN 201310564069A CN 103556220 A CN103556220 A CN 103556220A
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Abstract
The invention discloses a polycrystalline silicon ingot furnace which can enable the resistivity of a cast ingot to be distributed uniformly. A stop block for sealing a gas outlet is arranged at the gas outlet of a gas inlet pipe of the polycrystalline silicon ingot furnace, a plurality of spiral holes with the same helical direction are formed in the stop block, the plurality of the spiral holes are arranged around the central axis of the gas inlet pipe, inlets of the spiral holes are positioned on the upper surface of the stop block, and outlets of the spiral holes are positioned on the lower surface of the stop block. After argon gas passes through the spiral holes, the gas outlet way of the argon gas is changed from original direct blowing to rotating gas outlet, and the argon gas which is sprayed out of the spiral holes in a rotating manner can drive a silicon solution in a crucible to rotate, so that impurities contained in the silicon solution can be fully diffused in the silicon solution, the distribution of liquid-phase components is uniform, and the uniform distribution of the resistivity of the cast ingot is ensured; furthermore, the stirring of the silicon solution in the crucible can enable the volatile impurities contained in the silicon solution to be volatilized as soon as possible so as to ensure the quality and performance of the cast ingot. The polycrystalline silicon ingot furnace is suitable for popularization and application in the field of polycrystalline silicon production equipment.
Description
Technical field
The present invention relates to production of polysilicon apparatus field, especially a kind of polycrystalline silicon ingot or purifying furnace.
Background technology
Solar cell can be electric energy by transform light energy, is an emphasis of modern Energy-saving Society development.According to the difference of body material, existing solar cell is divided into polysilicon solar cell, monocrystaline silicon solar cell and class monocrystaline silicon solar cell.Wherein, the transformation efficiency of monocrystaline silicon solar cell is high, but production cost is also high, the transformation efficiency of polysilicon solar cell is than the low 1%-2% of monocrystaline silicon solar cell, but its production cost is also low, and class monocrystaline silicon solar cell is the battery between monocrystalline silicon battery and polysilicon solar cell.Consider, solar cell in the market still be take polysilicon solar cell as main.
The existing polycrystal silicon ingot for the production of polysilicon solar cell adopts casting ingot process system conventionally, casting ingot process is generally realized by polycrystalline silicon ingot or purifying furnace, existing polycrystalline silicon ingot or purifying furnace comprises, comprise body of heater, on body of heater, be provided with aspirating hole, in described body of heater, be provided with subiculum warming plate and stay-warm case, stay-warm case is placed on subiculum warming plate, stay-warm case and subiculum warming plate form heat insulating cage jointly, on described stay-warm case, be connected with the elevating lever that can make stay-warm case move up and down, in described heat insulating cage, be provided with crucible, crucible guard boards, graphite base plate, graphite cover plate, sidepiece well heater, top heater, heat exchange platform, described graphite base plate is placed on heat exchange platform, crucible is placed on graphite base plate, crucible guard boards is arranged on crucible outside, sidepiece well heater is arranged on the outside of crucible guard boards, graphite cover plate is arranged on crucible top, top heater is arranged on graphite cover plate top, described heat exchange platform is fixed on bottom of furnace body by graphite column, the upper end of crucible guard boards is provided with exhaust emissions hole, also comprise inlet pipe, described inlet pipe is successively through body of heater, stay-warm case, top heater, after graphite cover plate, stretch in crucible.
Current casting ingot process, is first after spraying-stocking process, then enters ingot casting operation.
Spraying: can react with crucible after silicon material high temperature melting, introduce impurity, and cause sticky pot, affect the quality of silicon ingot, so need to spray one deck silicon nitride solution between crucible and silicon material, utilize silicon nitride can effectively isolate silicon material and crucible, after silicon nitride solution spraying completes, carry out hyperthermia drying, the moisture evaporation by silicon nitride solution, just can make crucible inwall adhere to one deck silicon nitride coating again.
Charging: after crucible is dried, by fragmentary silicon material, in order, requirement and weight packs silicon material in crucible into.
The crucible of charged just can carry out next step casting ingot process, first charged crucible is packed in the body of heater of ingot furnace, after installing on request, by ingot furnace closing lid, the ingot furnace that closing lid is later, just forms the chamber of a sealing, the sealed crucible that installs silicon material is inner at ingot furnace, the casting ingot process that brings into operation, whole casting ingot process divides 6 processes, vacuumizes-heats-melt-grow brilliant-annealing-cooling.
S11, vacuumize: the air in body of heater is taken away from aspirating hole, and airborne oxygen and silicon material generation oxidizing reaction in the process that prevents from heating up, affect silicon ingot quality.Vacuumizing is to utilize vacuum pump that the air in body of heater is extracted out, until reach opening of device requirement.
S12, heating: after having vacuumized, enter the heating phase, heating is to approach temperature of fusion in order to make fast silicon material heat up, now the environment in furnace chamber is vacuum environment, can be conducive to, by being attached to the water vapour on silicon material surface, by the method vacuumizing, extract out, and be rapidly heated.
S13, fusing: in melting process, need in the chamber of sealing, fill argon gas, avoid being attached to the silicon nitride coating generation decomposition reaction of crucible inwall, argon gas is to be filled with in body of heater by inlet pipe.After fusing starts, in body of heater, start inflation, by processing sequence, be inflated to after specified pressure, start dynamically to keep.
S14, long brilliant: the silicon material having melted, start long crystalline substance, long brilliant process is to rising by the stay-warm case of body of heater inside, liquid-state silicon starts heat radiation from bottom, the liquid-state silicon of bottom becomes solid state si, and be accompanied by the rising of stay-warm case and scattering and disappearing of heat, slowly upwards solidify, until whole silicon ingot has solidified.
S15, annealing: because long brilliant process starts in bottom, and follow stay-warm case to rise, until top, push up like this because the reason of heat radiation at the end, will exist must temperature head, produces internal stress.The effect of annealing is exactly to guarantee, under isoperibol, to eliminate temperature head, thereby eliminates internal stress.
S16, cooling: quick cooling silicon ingot is to tapping temperature in furnace chamber.
From above-mentioned technological process, be not difficult to find out, existing technique is by adopting free volatileness that the volatile impurity in silicon solution is vapored away in melting process.But, the destruction that after the fusing of silicon material, overlong time can cause the inner silicon nitride coating of crucible, so, after having melted, general silicon material will start to cool to long brilliant temperature, the free volatilization time is shorter, most volatilizable impurity does not also volatilize, just enter the long brilliant stage, impurity is set in silicon ingot, and now the viscosity of silicon liquid is larger, not volatilizable impurity and volatilizable impurity are not fully spread in silicon solution, liquid composition skewness, cause existing in the ingot casting after solidifying impurity enriched district, cause the resistivity distribution of ingot casting inhomogeneous, badly influence the quality and performance of ingot casting itself.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of polycrystalline silicon ingot or purifying furnace that can make the uniform resistivity distribution of ingot casting.
The technical solution adopted for the present invention to solve the technical problems is: this polycrystalline silicon ingot or purifying furnace, comprise body of heater, on body of heater, be provided with aspirating hole, in described body of heater, be provided with subiculum warming plate and stay-warm case, stay-warm case is placed on subiculum warming plate, stay-warm case and subiculum warming plate form heat insulating cage jointly, on described stay-warm case, be connected with the elevating lever that can make stay-warm case move up and down, in described heat insulating cage, be provided with crucible, crucible guard boards, graphite base plate, graphite cover plate, sidepiece well heater, top heater, heat exchange platform, described graphite base plate is placed on heat exchange platform, crucible is placed on graphite base plate, crucible guard boards is arranged on crucible outside, sidepiece well heater is arranged on the outside of crucible guard boards, graphite cover plate is arranged on crucible top, top heater is arranged on graphite cover plate top, described heat exchange platform is fixed on bottom of furnace body by graphite column, the upper end of crucible guard boards is provided with exhaust emissions hole, also comprise inlet pipe, described inlet pipe is successively through body of heater, stay-warm case, top heater, after graphite cover plate, stretch in crucible, the place, air outlet of described inlet pipe is provided with the block of its sealing, on described block, be provided with the threaded hole that a plurality of rotation directions are identical, described a plurality of threaded hole is arranged around the central axis of inlet pipe, the import of described threaded hole is positioned at the upper surface of block, outlet is positioned at the lower surface of block.
Further, from air-flow and the angle between inlet pipe central axis of threaded hole ejection, it is 20 ℃～30 ℃.
Further, described air-flow and the angle between inlet pipe central axis from threaded hole ejection is 28 ℃.
Further, on described graphite cover plate, be provided with a plurality of through holes.
Be further, described bottom of furnace body is provided with overflow blanket, described overflow blanket is four-layer structure, be followed successively by from top to bottom knitting ceramic fiber blanket layer, knitting ceramic fiber blanket layer, ceramic fiber blanket layer, carbon carpet veneer, the thickness of described knitting ceramic fiber blanket layer is that the thickness of 10mm, knitting ceramic fiber blanket layer is that the thickness of 10mm, ceramic fiber blanket layer is that the thickness of 25mm, carbon carpet veneer is 10mm.
Further, the upper surface of described overflow blanket is provided with overflow silk.
Further, between adjacent graphite column, be provided with overflow silk.
Further, on described subiculum warming plate, be provided with a plurality of overflow weirs.
Further, between described crucible and crucible guard boards, be provided with carbon felt.
Further, described exhaust emissions hole is circular hole.
The invention has the beneficial effects as follows: by the place, air outlet in inlet pipe, arrange the block of its sealing, on described block, be provided with the threaded hole that a plurality of rotation directions are identical, described a plurality of threaded hole is arranged around the central axis of inlet pipe, the import of described threaded hole is positioned at the upper surface of block, outlet is positioned at the lower surface of block, when argon gas is after threaded hole, the mode of giving vent to anger of argon gas is changed, by original directly blowing, changing rotation into gives vent to anger, from the argon gas of threaded hole rotation ejection, can drive the silicon liquid rotation in crucible, thereby the impurity containing in silicon liquid is fully spread in silicon solution, liquid composition is evenly distributed, avoid existing in the ingot casting after solidifying impurity enriched district, the resistivity distribution that guarantees ingot casting is even, and the silicon liquid in crucible is stirred, can impel the volatilizable impurity containing in silicon liquid to volatilize as early as possible, thereby guarantee the quality and performance of ingot casting itself.
Accompanying drawing explanation
Fig. 1 is the structural representation of polycrystalline silicon ingot or purifying furnace of the present invention;
Fig. 2 is the local enlarged diagram of the A of Fig. 1;
Fig. 3 is the structural representation of graphite cover plate of the present invention;
Fig. 4 is the structural representation of overflow blanket of the present invention;
Fig. 5 is the structural representation of crucible guard boards of the present invention;
In figure, be labeled as: body of heater 1, aspirating hole 2, subiculum warming plate 3, stay-warm case 4, elevating lever 5, crucible 6, crucible guard boards 7, graphite base plate 8, graphite cover plate 9, sidepiece well heater 10, top heater 11, heat exchange platform 12, exhaust emissions hole 13, inlet pipe 14, block 15, threaded hole 16, through hole 17, overflow blanket 18, overflow silk 19, overflow weir 20, carbon felt 21, graphite column 22.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Fig. 1 to 5, this polycrystalline silicon ingot or purifying furnace, comprise body of heater 1, on body of heater 1, be provided with aspirating hole 2, in described body of heater 1, be provided with subiculum warming plate 3 and stay-warm case 4, stay-warm case 4 is placed on subiculum warming plate 3, stay-warm case 4 and the common formation heat insulating of subiculum warming plate 3 cage, on described stay-warm case 4, be connected with the elevating lever 5 that can make stay-warm case 4 move up and down, in described heat insulating cage, be provided with crucible 6, crucible guard boards 7, graphite base plate 8, graphite cover plate 9, sidepiece well heater 10, top heater 11, heat exchange platform 12, described graphite base plate 8 is placed on heat exchange platform 12, crucible 6 is placed on graphite base plate 8, crucible guard boards 7 is arranged on crucible 6 outsides, sidepiece well heater 10 is arranged on the outside of crucible guard boards 7, graphite cover plate 9 is arranged on crucible 6 tops, top heater 11 is arranged on graphite cover plate 9 tops, described heat exchange platform 12 is fixed on body of heater 1 bottom by graphite column 22, the upper end of crucible guard boards 7 is provided with exhaust emissions hole 13, also comprise inlet pipe 14, described inlet pipe 14 is successively through body of heater 1, stay-warm case 4, top heater 11, after graphite cover plate 9, stretch in crucible 6, the place, air outlet of described inlet pipe 14 is provided with the block of its sealing 15, on described block 15, be provided with the threaded hole 16 that a plurality of rotation directions are identical, described a plurality of threaded hole 16 is arranged around the central axis of inlet pipe 14, the import of described threaded hole 16 is positioned at the upper surface of block 15, outlet is positioned at the lower surface of block 15.By the place, air outlet in inlet pipe 14, arrange the block of its sealing 15, on described block 15, be provided with the threaded hole 16 that a plurality of rotation directions are identical, described a plurality of threaded hole 16 is arranged around the central axis of inlet pipe 14, the import of described threaded hole 16 is positioned at the upper surface of block 15, outlet is positioned at the lower surface of block 15, when argon gas is after threaded hole 16, the mode of giving vent to anger of argon gas is changed, by original directly blowing, changing rotation into gives vent to anger, from the argon gas of threaded hole 16 rotation ejections, can drive the silicon liquid rotation in crucible 6, thereby the impurity containing in silicon liquid is fully spread in silicon solution, liquid composition is evenly distributed, avoid existing in the ingot casting after solidifying impurity enriched district, the resistivity distribution that guarantees ingot casting is even, and the silicon liquid in crucible 6 is stirred, can impel the volatilizable impurity containing in silicon liquid to volatilize as early as possible, thereby guarantee the quality and performance of ingot casting itself.
In the above-described embodiment, in order to make argon gas can promote as far as possible the silicon liquid rotation in crucible 6, from air-flow and the angle between inlet pipe 14 central axis of threaded hole 16 ejections, it is 20 ℃～30 ℃.Be further, the described air-flow from threaded hole 16 ejections and the angle between inlet pipe 14 central axis are 28 ℃, can make the silicon liquid in crucible 6 rotate faster, liquid composition be distributed more even, and impel the volatilizable impurity containing in silicon liquid to volatilize as early as possible.
In long brilliant process, crucible 6 inside need to have certain thermograde from top to bottom, be that temperature in crucible 6 reduces from the top down gradually, thermograde changes more obvious, the speed of growth of ingot casting is faster, the temperature of crucible 6 internal upper parts is mainly to provide by top heater 11, the heat of top heater 11 is delivered in crucible 6 after seeing through graphite cover plate 9 again, due to the obstruct through graphite cover plate 9, the temperature of graphite cover plate 9 tops will be higher than the temperature of graphite cover plate 9 belows, because the sidepiece well heater 10 of existing polycrystalline silicon ingot or purifying furnace and top heater 11 are all unified controls, and in the long brilliant stage, temperature must be controlled at certain scope, Here it is makes sidepiece well heater 10 and the top heater 11 all can only be with identical power work, that is to say that the heat that sidepiece well heater 10 and top heater 11 provide is certain, if make the temperature of crucible 6 internal upper parts higher, just must make more heats can see through graphite cover plate 9 is delivered in crucible 6, thereby the interior thermograde of crucible 6 is changed obviously, the invention provides a kind of simple and effective way reaches the interior thermograde of crucible 6 and changes obvious object, on described graphite cover plate 9, be provided with a plurality of through holes 17, by a plurality of through holes 17 are set on graphite cover plate 9, the heat of top heater 11 can be unseparated the through hole 17 that passes through be delivered in crucible 6, the temperature of crucible 6 internal upper parts can be increased for original, thereby the thermograde in crucible 6 is changed obviously, and then the speed of growth of increase ingot casting, this mode only need be beaten several through holes 17 on original graphite cover plate 9, substantially can not increase cost, repacking is also very convenient simultaneously.
Polycrystalline silicon ingot or purifying furnace in use, there is sometimes the phenomenon of silicon hydrorrhea stream, once there is silicon hydrorrhea stream, the silicon liquid overflowing can flow on the subiculum warming plate 3 of below along heat exchange platform 12, then silicon liquid drops onto the bottom of body of heater 1 again from the edge of subiculum warming plate 3, because silicon liquid temp is higher, thereby silicon liquid is easy to body of heater 1 to burn accidents caused, silicon liquid for fear of overflow burns body of heater 1, described body of heater 1 bottom is provided with overflow blanket 18, overflow blanket 18 separates the silicon liquid overflowing and body of heater 1, effectively avoided silicon liquid that body of heater 1 is burnt, even if silicon liquid burns overflow blanket 18, now the temperature of silicon liquid is also lower, can not cause too large loss to body of heater 1.In order to prevent that silicon liquid from burning overflow blanket 18, described overflow blanket 18 is four-layer structure, be followed successively by from top to bottom knitting ceramic fiber blanket layer, knitting ceramic fiber blanket layer, ceramic fiber blanket layer, carbon carpet veneer, the thickness of described knitting ceramic fiber blanket layer is that the thickness of 10mm, knitting ceramic fiber blanket layer is that the thickness of 10mm, ceramic fiber blanket layer is that the thickness of 25mm, carbon carpet veneer is 10mm.
For being known in time, operator whether there is silicon hydrorrhea stream, the upper surface of described overflow blanket 18 is provided with overflow silk 19, once there is silicon hydrorrhea stream, the silicon liquid overflowing will blow the overflow silk 19 that is arranged on overflow blanket 18 surfaces after dropping on overflow blanket 18, after overflow silk 19 blows, can send guard signal, alert is carried out relating operation.Because the silicon liquid of overflow is easy to along graphite column 22 to dirty, therefore, in order to monitor quickly the generation of overflow phenomena, between adjacent graphite column 22, be provided with overflow silk 19.Because flowing to the edge that will flow to subiculum warming plate 3 after subiculum warming plate 3, could continue to dirty the silicon liquid of overflow, so just cause overflow phenomena to occur just can monitor after for some time, so just increased the probability having an accident, therefore, for whether monitoring quickly there is silicon hydrorrhea flow phenomenon, on described subiculum warming plate 3, be provided with a plurality of overflow weirs 20, by overflow weir 20 is set on subiculum warming plate 3, after flowing to subiculum warming plate 3, silicon liquid can directly from overflow weir 20, flow to the overflow blanket 18 of below, and then blow being arranged on the overflow silk 19 arranging on overflow blanket 18, thereby reach the object of fast monitored.
In addition, it is more even for crucible 6 is heated, between described crucible 6 and crucible guard boards 7, be provided with carbon felt 21, the heat of sidepiece well heater 10 passes to crucible 6 through carbon felt 21 after seeing through crucible guard boards 7 again, because carbon felt 21 has good heat preservation and insulation, therefore, heat can not see through fast carbon felt 21 and be delivered in crucible 6, can make like this heat obtain homogenizing when seeing through carbon felt 21, thereby crucible 6 is heated evenly, can improve the qualification rate of product.
In order to be better conducive to the volatilization of impurity, described exhaust emissions hole 13 is circular hole, original exhaust emissions hole 13 is square slotted eye, when tail gas is discharged from square slotted eye, the air flow line of tail gas is more at random, irregular, be unfavorable for the volatilization of impurity, changed into after circular hole, can make the air flow line of tail gas regular, thereby be conducive to the volatilization of impurity.
Claims (10)
1. polycrystalline silicon ingot or purifying furnace, comprise body of heater (1), on body of heater (1), be provided with aspirating hole (2), in described body of heater (1), be provided with subiculum warming plate (3) and stay-warm case (4), stay-warm case (4) is placed on subiculum warming plate (3), stay-warm case (4) forms heat insulating cage jointly with subiculum warming plate (3), on described stay-warm case (4), be connected with the elevating lever (5) that can make stay-warm case (4) move up and down, in described heat insulating cage, be provided with crucible (6), crucible guard boards (7), graphite base plate (8), graphite cover plate (9), sidepiece well heater (10), top heater (11), heat exchange platform (12), described graphite base plate (8) is placed on heat exchange platform (12), crucible (6) is placed on graphite base plate (8), crucible guard boards (7) is arranged on crucible (6) outside, sidepiece well heater (10) is arranged on the outside of crucible guard boards (7), graphite cover plate (9) is arranged on crucible (6) top, top heater (11) is arranged on graphite cover plate (9) top, described heat exchange platform (12) is fixed on body of heater (1) bottom by graphite column (22), the upper end of crucible guard boards (7) is provided with exhaust emissions hole (13), also comprise inlet pipe (14), described inlet pipe (14) is successively through body of heater (1), stay-warm case (4), top heater (11), after graphite cover plate (9), stretch in crucible (6), it is characterized in that: the place, air outlet of described inlet pipe (14) is provided with the block of its sealing (15), on described block (15), be provided with the threaded hole that a plurality of rotation directions are identical (16), described a plurality of threaded hole (16) is arranged around the central axis of inlet pipe (14), the import of described threaded hole (16) is positioned at the upper surface of block (15), outlet is positioned at the lower surface of block (15).
2. polycrystalline silicon ingot or purifying furnace as claimed in claim 1, is characterized in that: from the air-flow of threaded hole (16) ejection and the angle between inlet pipe (14) central axis, be 20 ℃～30 ℃.
3. polycrystalline silicon ingot or purifying furnace as claimed in claim 2, is characterized in that: the described air-flow from threaded hole (16) ejection and the angle between inlet pipe (14) central axis are 28 ℃.
4. according to the polycrystalline silicon ingot or purifying furnace described in any one claim in claims 1 to 3, it is characterized in that: on described graphite cover plate (9), be provided with a plurality of through holes (17).
5. polycrystalline silicon ingot or purifying furnace as claimed in claim 4, it is characterized in that: described body of heater (1) bottom is provided with overflow blanket (18), described overflow blanket (18) is four-layer structure, be followed successively by from top to bottom knitting ceramic fiber blanket layer, knitting ceramic fiber blanket layer, ceramic fiber blanket layer, carbon carpet veneer, the thickness of described knitting ceramic fiber blanket layer is that the thickness of 10mm, knitting ceramic fiber blanket layer is that the thickness of 10mm, ceramic fiber blanket layer is that the thickness of 25mm, carbon carpet veneer is 10mm.
6. polycrystalline silicon ingot or purifying furnace as claimed in claim 5, is characterized in that: the upper surface of described overflow blanket (18) is provided with overflow silk (19).
7. polycrystalline silicon ingot or purifying furnace as claimed in claim 6, is characterized in that: between adjacent graphite column (22), be provided with overflow silk (19).
8. polycrystalline silicon ingot or purifying furnace as claimed in claim 7, is characterized in that: on described subiculum warming plate (3), be provided with a plurality of overflow weirs (20).
9. polycrystalline silicon ingot or purifying furnace as claimed in claim 8, is characterized in that: between described crucible (6) and crucible guard boards (7), be provided with carbon felt (21).
10. polycrystalline silicon ingot or purifying furnace as claimed in claim 9, is characterized in that: described exhaust emissions hole (13) is circular hole.
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| CN105603522A (en) * | 2016-02-03 | 2016-05-25 | 陈鸽 | Polycrystalline silicon ingot furnace with diversion device |
| CN105543954B (en) * | 2016-02-03 | 2017-12-08 | 重庆丰银包装材料有限公司 | A kind of polycrystalline ingot furnace with carrier gas heater |
| CN107699945A (en) * | 2016-02-03 | 2018-02-16 | 陈鸽 | A kind of polycrystalline ingot furnace with carrier gas heater and guiding device |
| CN107815731A (en) * | 2016-02-03 | 2018-03-20 | 陈鸽 | A kind of polycrystalline ingot furnace with carrier gas heater |
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| CN105543954A (en) * | 2016-02-03 | 2016-05-04 | 陈鸽 | Polycrystal ingot casting furnace with carrier gas heater |
| CN107513763B (en) * | 2016-02-03 | 2019-11-08 | 江苏锡沂高新区科技发展有限公司 | A kind of guiding device for polycrystalline ingot furnace |
| CN109579527A (en) * | 2018-11-29 | 2019-04-05 | 大余明发矿业有限公司 | A kind of pure oxygen mixed gas submerged combustion bath smelting furnace |
| CN109321972A (en) * | 2018-12-14 | 2019-02-12 | 扬州荣德新能源科技有限公司 | A kind of polycrystalline furnace contains gas guiding device |
| CN111394790A (en) * | 2020-04-26 | 2020-07-10 | 新余学院 | Low-impurity polycrystalline silicon ingot furnace |
| CN111850673A (en) * | 2020-07-27 | 2020-10-30 | 江苏协鑫硅材料科技发展有限公司 | Gas stirring device, ingot furnace and using method thereof |
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