CN210177000U - Carbon-carbon heating body structure - Google Patents
Carbon-carbon heating body structure Download PDFInfo
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- CN210177000U CN210177000U CN201920033013.7U CN201920033013U CN210177000U CN 210177000 U CN210177000 U CN 210177000U CN 201920033013 U CN201920033013 U CN 201920033013U CN 210177000 U CN210177000 U CN 210177000U
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Abstract
The utility model discloses a carbon-carbon heating element structure and a manufacturing process thereof, which adopts the conventional weftless plane fabric and a net tire to be overlapped layer by layer, and obtains a carbon-carbon heater prefabricated body through needle-punching forming; or overlapping and layering the self-grinding laid flat fabric and the net tire layer by layer, forming by needling to obtain a carbon/carbon heater preform, and performing subsequent carbonization, densification and high-temperature treatment to obtain the carbon/carbon heater. The utility model discloses a body structure and product machine tooling design provide an ingot furnace lateral part carbon/carbon heater along longitudinal resistance transmutation, do not relate to great engineering volume designs such as furnace body transformation, the long brilliant stage technological parameter accurate control of ingot casting process, it is all smaller to equipment precision and artifical standardization requirement, it is also relatively shorter to verify the cycle simultaneously, be a low cost, high efficiency, the measure of ingot casting in-process longitudinal temperature difference problem is solved to the pertinence, effectively promote the crystal silicon yield.
Description
Technical Field
The utility model relates to a carbon heater field, specifically speaking, in particular to carbon heating element structure and manufacturing process thereof.
Background
The solar photovoltaic cell comprises monocrystalline silicon and polycrystalline silicon cells, but the polycrystalline silicon conversion efficiency is low, the monocrystalline silicon cost is high, and the attenuation is large. In order to integrate the advantages of both polycrystalline and single crystal, single crystal-like processes have been developed in the prior art, but they still suffer from the following problems:
in the crystal silicon ingot casting process of the single crystal-like process, the heat insulation cage is lifted, air flow enters from a gap at the bottom, the heating power of the whole heating body from bottom to top is the same as the height of the side heater is fixed, the longitudinal temperature in the furnace body is controlled by the air flow, and the temperature gradient is difficult to control in a reasonable range, so that the crystal silicon ingot inclination phenomenon can occur in the crystal growth process.
In addition, in the crystal growth stage of the crystalline silicon cast ingot, the heat insulation cage is lifted, the temperature in the furnace body is uneven due to airflow heat dissipation, the middle temperature of the crucible is high generally, the peripheral temperature of the crucible is low, particularly, the bottom of the crucible is arc-shaped, the crystal growth is fast at the periphery, the crystal growth is slow at the middle, and defects are formed.
In order to ensure the level of a silicon liquid interface in the crystal growth process, an upper heater and a lower heater are adopted for heating in opposite directions at present, a heat exchange platform is additionally arranged at the bottom, and the temperature of the bottom of a crucible is uniform. However, in the heating mode, longitudinal temperature difference still exists, and the temperature of the bottom at the periphery is reduced more quickly than that of the middle; in addition, the ingot casting process is controlled through full power, all stages of the ingot casting process are completed through power and time control, a stable heat source is provided, the temperature difference of the upper temperature gradient and the lower temperature gradient during the growth of the silicon ingot is effectively reduced, the internal stress of the silicon ingot is eliminated, the fluctuation of a thermal field is reduced to the maximum extent, and therefore the quality of the silicon ingot is improved.
The prior art mainly focuses on temperature and power control of an upper heater and a lower heater of an ingot furnace, design of a furnace body and air flow in the furnace and stage process control of an ingot casting process, so that some problems existing in the single crystal-like process at present are solved. The control means improves the crystal defects to a certain extent, but has little influence on the yield improvement. The heat exchange platform at the bottom in the ingot furnace only homogenizes the temperature at the bottom of the crucible, and the problem of longitudinal temperature difference in the furnace is not solved; through the design of the furnace body and the air flow in the furnace, the relative engineering quantity is large, the influence factors are more, comprehensive analysis is needed, and the cost is higher; the control requirements of the process control on the temperature and the time in the ingot casting process are higher, and the process control is not only related to the accuracy of equipment but also normative of a manual operation flow. At present, resistance of a side heater for a thermal field of a polycrystalline ingot furnace is uniformly distributed basically, all areas of heat productivity from top to bottom are the same, and heat dissipation is not uniform under the influence of airflow in a crystal growth stage, so that a silicon ingot is inclined, and the quality of cast crystal silicon is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a carbon-carbon heating body structure and manufacturing process to not enough among the prior art to solve the problem that exists among the prior art.
The utility model provides a technical problem can adopt following technical scheme to realize:
a carbon-carbon heating element structure with a gradual change function of heating power comprises a heating element, wherein the section of the heating element is trapezoidal, and carbon fiber filament bundles with the same specification are uniformly distributed in the heating element to form a heating area with gradually changed heating power.
A carbon-carbon heating element structure with a gradual change function of heating power comprises a heating element, wherein the section of the heating element is rectangular, and carbon fiber filament bundles with the same specification are distributed in the heating element from dense to sparse to form a heating area with gradually changed heating power.
Further, the carbon fiber filament bundles with the same specification are 12k carbon fiber filament bundles which are distributed on the thin net tire formed by the short carbon fibers in a sparse-to-dense mode.
A carbon-carbon heating body structure with a gradual change function of heating power comprises a heating body, wherein the section of the heating body is rectangular, and carbon fiber filament bundles with different specifications are distributed in the heating body to form a heating area with gradually changed heating power.
Further, the carbon fiber filament bundles of different specifications include 3K, 6K, 12K and 24K carbon fiber filament bundles which are sequentially distributed on the thin web composed of the short carbon fibers.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses a body structure and product machine tooling design provide an ingot furnace lateral part carbon/carbon heater along longitudinal resistance (heating power) transmutation, do not relate to great engineering volume designs such as furnace body transformation, the accurate control of the long brilliant stage process parameter of ingot casting process, it is all smaller to equipment precision and artifical standardization requirement, it is also relatively shorter to verify the cycle simultaneously, a low cost, high efficiency, the measure of ingot casting in-process longitudinal temperature difference problem is solved to the pertinence, effectively promote the crystal silicon yield.
Drawings
Fig. 1 is a schematic view of a conventional carbon side heater.
FIG. 2 is a schematic view of a heat-generating body according to example 1 of the present invention.
FIG. 3 is a schematic view showing the distribution of carbon fiber filament bundles of a heat-generating body according to example 3 of the present invention.
FIG. 4 is a schematic view showing the distribution of carbon fiber filament bundles of a heat-generating body according to example 3 of the present invention.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.
Referring to fig. 1, the conventional side carbon heater has a flat plate shape, and the resistivity between two points on the entire surface is the same, so that the heat generation power of the entire surface after current is applied is substantially the same. The resistivity of conventional carbon-carbon materials is about 2-3.5x10-5Ω M, and typically the total resistance of one side heater is 14-20M Ω.
Referring to fig. 2, fig. 3 and fig. 4, the carbon-carbon heating element structure of the present invention realizes gradient distribution of heating element resistance and gradual change of heating power of the carbon-carbon heater through the following two methods.
1) The conventional non-weft plain weave fabric and the mesh tire are overlapped layer by layer, a carbon heater preform is obtained through needle punching forming, after subsequent densification and high-temperature treatment, thickness processing is carried out, the end face of the heater is in a trapezoid shape from top to bottom, so that the carbon/carbon heater is different in resistance of each point from top to bottom, the resistance is gradually reduced along with the increase of the sectional area, and the heating power is increased through the increase of current.
2) And (3) overlapping and layering the self-ground weftless plane fabric and the net tire layer by layer, forming by needling to obtain a carbon/carbon heater preform, and performing subsequent carbonization, densification and high-temperature treatment to obtain the carbon/carbon heater. The self-grinding laid plane fabric comprises two types: one of the carbon filaments is arranged on a net tire with certain gram weight by 3K, 6K, 12K and 24K carbon filaments according to a certain sequence, proportion and quantity; the other one is made up by using 12K carbon filaments, according to a certain density design, arranging them on a net body with a certain gram weight, and making them pass through the process of needling and compounding. When the prefabricated body is formed by needling, the laid flat fabric is layered in a fixed direction, so that the prefabricated body with the number of long fibers distributed from top to bottom from sparse to dense is obtained, and finally the carbon/carbon heater with gradually changed longitudinal resistance and heating power is obtained.
Example 1
A carbon-carbon heating element structure with a gradual change function of heating power comprises a heating element, wherein the section of the heating element is trapezoidal, and carbon fiber filament bundles with the same specification are uniformly distributed in the heating element to form a heating area with gradually changed heating power.
A manufacturing process of a carbon heater with a gradual heating power change function comprises the following steps:
1) cutting carbon fibers into short fibers with the length of 30-90mm, forming a thin net blank by opening and carding, then uniformly laying carbon fiber filament bundles with the same specification on the thin net blank, and compounding the short fibers and the carbon fiber filament bundles into continuous unidirectional cloth by needling;
2) cutting unidirectional cloth according to the specification, then laminating the cut unidirectional cloth together according to the alternative layering mode of 0-90 degrees or 0-45-90 degrees, and compounding the unidirectional cloth together through needling to prepare a prefabricated body of a plate;
3) dipping the prefabricated body of the plate into glue, wherein the glue is phenolic resin, furan resin, epoxy resin or asphalt, and then hot-pressing the glue into the plate through a flat press;
4) carbonizing the pressed plate at 850-1100 ℃ for 20 hours;
5) densifying the carbonized plate;
6) putting the plate with the density meeting the requirement into a high-temperature furnace for high-temperature treatment, thereby achieving the purposes of removing stress and discharging impurities; the high-temperature treatment temperature of the high-temperature furnace is higher than the use temperature of the plate, and is 1850-2400 ℃;
7) and machining the plate subjected to high-temperature treatment into a trapezoid in the thickness direction.
The carbon-carbon heater with the gradual change function of the heating power comprises a heating body, wherein the section of the heating body is rectangular, and carbon fiber filament bundles with the same specification are distributed in the heating body from dense to sparse to form a heating area with the gradual change of the heating power.
Example 2
A manufacturing process of a carbon-carbon heating body structure with a heating power gradual change function comprises the following steps:
1) cutting carbon fibers into short fibers with the length of 30-90mm, forming a thin net blank by opening and carding, then laying carbon fiber filament bundles with the same specification on the thin net blank from dense to sparse arrangement, and compounding the short fibers and the carbon fiber filament bundles into continuous unidirectional cloth by needling;
2) cutting unidirectional cloth according to the specification, then laminating the cut unidirectional cloth together according to the alternative layering mode of 0-90 degrees or 0-45-90 degrees, and compounding the unidirectional cloth together through needling to prepare a prefabricated body of a plate;
3) dipping the prefabricated body of the plate into glue, wherein the glue is phenolic resin, furan resin, epoxy resin or asphalt, and then hot-pressing the glue into the plate through a flat press;
4) carbonizing the pressed plate at 850-1100 ℃ for 20 hours;
5) densifying the carbonized plate;
6) putting the plate with the density meeting the requirement into a high-temperature furnace for high-temperature treatment, thereby achieving the purposes of removing stress and discharging impurities; the high-temperature treatment temperature of the high-temperature furnace is higher than the use temperature of the plate, and is 1850-2400 ℃;
7) and machining the plate subjected to high-temperature treatment into a flat plate.
A carbon-carbon heating body structure with a gradual change function of heating power comprises a heating body, wherein the section of the heating body is rectangular, and carbon fiber filament bundles with different specifications are distributed in the heating body to form a heating area with gradually changed heating power.
Example 3
A manufacturing process of a carbon-carbon heating body structure with a heating power gradual change function comprises the following steps:
1) cutting carbon fibers into short fibers with the length of 30-90mm, forming a thin net blank by opening and carding, then arranging and laying a plurality of carbon fiber long tows with different specifications on the thin net blank, and compounding the short fibers and the carbon fiber long tows into continuous unidirectional cloth by needling;
2) cutting unidirectional cloth according to the specification, then laminating the cut unidirectional cloth together according to the alternative layering mode of 0-90 degrees or 0-45-90 degrees, and compounding the unidirectional cloth together through needling to prepare a prefabricated body of a plate;
3) dipping the prefabricated body of the plate into glue, wherein the glue is phenolic resin, furan resin, epoxy resin or asphalt, and then hot-pressing the glue into the plate through a flat press;
4) carbonizing the pressed plate at 850-1100 ℃ for 20 hours;
5) densifying the carbonized plate;
6) putting the plate with the density meeting the requirement into a high-temperature furnace for high-temperature treatment, thereby achieving the purposes of removing stress and discharging impurities; the high-temperature treatment temperature of the high-temperature furnace is higher than the use temperature of the plate, and is 1850-2400 ℃;
7) and machining the plate subjected to high-temperature treatment into a flat plate.
Further, the densification method in the step 5) includes the following three methods:
a: placing the carbonized sheet material into a high-pressure impregnation furnace, impregnating phenolic resin, furan resin, epoxy resin or asphalt into the sheet material by pressurizing, wherein the impregnation pressure is 1.5-8MPa, then carbonizing the impregnated sheet material, impregnating and carbonizing again after carbonization is finished, and repeating the above processes until the density of the sheet material is more than 1.5g/cm3The carbonization temperature is 850-1100 ℃;
a primary high-temperature carbonization treatment can be added in the multiple carbonization processes, the temperature of the high-temperature carbonization treatment is more than 1500 ℃, and the high-temperature carbonization treatment is used for improving the aperture ratio and reducing the dipping times;
b: placing the carbonized plate into a CVD vapor deposition furnace, and cracking natural gas at high temperature to deposit carbon in the pores of the plate, thereby improving the density of the plate; repeating the above process until the density of the plate is more than 1.5g/cm3The carbonization temperature is 850-1100 ℃, and the deposition temperature is 900-1300 ℃;
c, combining the two modes of a and b, performing vapor deposition for one or two periods, and then performing impregnation, carbonization and densification for several periods until the density of the plate is more than 1.5g/cm3。
The utility model discloses an above-mentioned three embodiment all can realize the effect that same plate-like heat-generating body heating power changes, and embodiment 1's method production is simple, and the resistivity of the material of production itself is the same, only needs to reach the requirement through machining, but because the difference of thickness, leads to having great stress and thermal expansion difference in the heat-generating body use, makes panel warp, has certain influence to life. In the embodiments 2 and 3, the effect of changing the heating power of the same plate-shaped heating element is achieved by designing the resistivity of the material, the production process is complex, the cost is high, and the service life can be prolonged.
The utility model discloses well production has the panel preform of resistivity gradual change and is the biggest innovation point of core, and the key point produces the plate-like carbon heat-generating body of resistance gradual change promptly through two kinds of modes. The whole densification process is a common process in the industry.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The carbon-carbon heating element structure with the gradual change function of the heating power comprises a heating body and is characterized in that the section of the heating body is trapezoidal, and carbon fiber filament bundles with the same specification are uniformly distributed in the heating body to form a heating area with the gradual change of the heating power.
2. A carbon-carbon heat-generating body structure having a function of gradually changing heat-generating power as described in claim 1, wherein the carbon fiber filament bundle of the same specification is a 12k carbon fiber filament bundle which is distributed thinly and densely on a thin web composed of short carbon fibers.
3. The carbon-carbon heating element structure with the gradual change function of the heating power comprises a heating body and is characterized in that the section of the heating body is rectangular, and carbon fiber filament bundles with the same specification are distributed in the heating body from dense to sparse to form a heating area with the gradual change of the heating power.
4. The carbon-carbon heating element structure with the gradual change function of the heating power comprises a heating body and is characterized in that the section of the heating body is rectangular, and carbon fiber filament bundles with different specifications are distributed in the heating body to form a heating area with the gradual change of the heating power.
5. A carbon-carbon heat-generating body structure having a heat-generating power gradually-changing function as described in claim 4, wherein said carbon fiber filament bundles of different specifications include 3K, 6K, 12K and 24K carbon fiber filament bundles, which are distributed in order on a thin web composed of short carbon fibers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920033013.7U CN210177000U (en) | 2019-01-09 | 2019-01-09 | Carbon-carbon heating body structure |
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| CN201920033013.7U CN210177000U (en) | 2019-01-09 | 2019-01-09 | Carbon-carbon heating body structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688643A (en) * | 2019-01-09 | 2019-04-26 | 嘉兴启晟碳材料有限公司 | A kind of carbon carbon heater and its manufacturing process |
| CN113816757A (en) * | 2021-10-29 | 2021-12-21 | 西安美兰德新材料有限责任公司 | Method for quickly preparing carbon-carbon composite material heat-insulating barrel |
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2019
- 2019-01-09 CN CN201920033013.7U patent/CN210177000U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688643A (en) * | 2019-01-09 | 2019-04-26 | 嘉兴启晟碳材料有限公司 | A kind of carbon carbon heater and its manufacturing process |
| CN109688643B (en) * | 2019-01-09 | 2022-02-01 | 湖南启晟新材料有限公司 | Manufacturing method of carbon-carbon heater |
| CN113816757A (en) * | 2021-10-29 | 2021-12-21 | 西安美兰德新材料有限责任公司 | Method for quickly preparing carbon-carbon composite material heat-insulating barrel |
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