CN215103682U - Integral spiral braided crucible preform and integral spiral braided coating crucible - Google Patents
Integral spiral braided crucible preform and integral spiral braided coating crucible Download PDFInfo
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- CN215103682U CN215103682U CN202022349028.XU CN202022349028U CN215103682U CN 215103682 U CN215103682 U CN 215103682U CN 202022349028 U CN202022349028 U CN 202022349028U CN 215103682 U CN215103682 U CN 215103682U
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Abstract
The utility model relates to a coating crucible that whole spiral was woven crucible preform and whole spiral was woven, the crucible preform is woven the dictyosome that forms by one or many carbon fiber rope spirals, the crucible is woven for the netted fretwork of upper end opening lower extreme. The crucible is formed by weaving one carbon fiber rope or a plurality of carbon fiber ropes, and a prefabricated body does not need to be needled, so that the working time is saved; the straight carbon fiber rope is adopted for weaving, a blank does not need to be manufactured, the shape plasticity is strong, the blank is not limited, the flexible design can be realized, the delivery period is shortened in batch production, and the material processing waste is less.
Description
Technical Field
The utility model relates to a carbon-fibre composite's in monocrystalline silicon or polycrystalline silicon's the manufacturing process application, concretely relates to adopt carbon-fibre composite to weave the whole spiral of preparation and weave crucible preform and with its coating crucible of making.
Background
In the production of silicon single crystals, the czochralski method (CZ method), which is a method of pulling a single crystal from a melt in a vertical direction, is currently widely used. In the manufacturing apparatus, one of the members is a graphite crucible for carrying a quartz crucible therein. In the using process, the problems of cracking, erosion loss and the like of the graphite crucible exist due to different expansion coefficients of the quartz crucible and the graphite crucible and the erosion reaction between silicon vapor and graphite. Moreover, as the diameter of the crystal grown by the single crystal silicon is thicker and thicker, the diameter of the corresponding single crystal furnace is larger and larger, and thus the reliability of the thermal field is required to be higher and higher. Because of the strength limitation of the graphite crucible, the larger the diameter, the larger the wall thickness requirement, so the weight is heavy, and the heat capacity is high, thereby leading to heavy operation, increased energy consumption and increased cost.
As a technique not using a large-sized graphite crucible, the applicant has proposed a technique including forming carbon fibers into a crucible shape by a filament winding method, impregnating them with a resin or pitch as a matrix, and then firing to manufacture a crucible made of a carbon/carbon fiber composite material (hereinafter referred to as a C/C composite material), a technique including attaching a carbon fiber cloth to a forming die, forming and curing to obtain a carbon fiber-reinforced plastic, and then impregnating and firing to manufacture a crucible made of a C/C composite material, and the like. For example, patent No. 200910118210.X discloses a crucible holding member of a hollow mesh body, which is formed by braiding a plurality of strands; however, these crucibles formed by weaving must be processed by adding a binder, carbonizing at a high temperature, and vapor-depositing, which is very time-consuming, but the edges of these crucibles are not reinforced and have no surface coating treatment, so that the edge portions of the crucibles are very easily corroded during use, resulting in insufficient strength.
Thus, the prior art crucible also has a place to lift.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a whole spiral that carbon-fibre composite woven weaves crucible preform and with its coating crucible of making to solve prior art's problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an integral spiral weaves crucible preform, crucible preform is by the dictyosome that one or many carbon fiber rope spiral weaves and form, the crucible is the netted fretwork of upper end opening lower extreme and weaves.
The integrally spirally woven crucible preform according to the preferred embodiment of the present application, which comprises a body portion; the crucible body portion is including straight barrel, bowl body and bowl bottom body, crucible body portion includes a plurality of axial strips, and one or many carbon fiber rope winds axial strip spiral is woven, the axial strip with the contained angle that carbon fiber rope spiral woven the direction is less than 90 degrees for being greater than 70 degrees, the bowl bottom body is woven for netted fretwork.
The integrally spirally woven crucible preform according to a preferred embodiment of the present application, the crucible preform comprising: the crucible body comprises a straight cylinder body, a bowl-shaped body and a bowl bottom body; the crucible body part comprises a plurality of axial strips, one or more carbon fiber ropes are spirally woven around the axial strips, the included angle between the axial strips and the spiral weaving direction of the carbon fiber ropes is more than 70 degrees and less than 90 degrees, and the upper edge sealing part and the crucible body part are woven and connected by one or more carbon fiber ropes; the bowl bottom body is a netted hollow woven structure.
The utility model provides a coating crucible that whole spiral was woven, the reticulation body that the crucible was woven by one or many carbon fiber rope spirals and is formed, the crucible is woven for the netted fretwork of upper end opening lower extreme, and carbon fiber surface and between cladding or packing deposit carbon layer or sclerosis thing layer.
The integrally spiral-woven coated crucible according to the preferred embodiment of the present application, which comprises a body portion; the crucible body portion is including straight barrel, bowl body and bowl bottom body, crucible body portion includes a plurality of axial strips, and one or many carbon fiber rope winds axial strip spiral is woven, the axial strip with the contained angle that carbon fiber rope spiral woven the direction is less than 90 degrees for being greater than 70 degrees, the bowl bottom body is woven for netted fretwork.
The integrally spiral-woven coated crucible according to the preferred embodiment of the present application, comprising: the crucible body comprises a straight cylinder body, a bowl-shaped body and a bowl bottom body; the crucible body part comprises a plurality of axial strips, one or more carbon fiber ropes are spirally woven around the axial strips, the included angle between the axial strips and the spiral weaving direction of the carbon fiber ropes is more than 70 degrees and less than 90 degrees, and the upper edge sealing part and the crucible body part are woven and connected by one or more carbon fiber ropes; the bowl bottom body is a netted hollow woven structure.
According to the application, the integrally woven coating crucible is preferably implemented, the meshed body woven by the meshed hollow-out of the bowl bottom body comprises one or more carbon fiber ropes and one or more carbon fiber ropes, wherein one part of the one or more carbon fiber ropes is radiated outwards from the circle center, one part of the one or more carbon fiber ropes is encircled into a circle, one or more carbon fiber ropes radiated outwards from the circle center are in mesh hollow-out at one time above the one or more carbon fiber ropes, and one time is in mesh hollow-out in cross connection with the lower part of the one or more carbon fiber ropes encircled into a circle.
According to the integrally woven coating crucible implemented in the application, the reticular body of the bowl bottom body, which is reticular and hollowed and woven, comprises a first group of carbon fiber ropes and a second group of carbon fiber ropes; the carbon fiber ropes forming the first group of carbon fiber ropes are consistent in direction, and the carbon fiber ropes forming the second group of carbon fiber ropes are consistent in direction; the first group of carbon fiber ropes are arranged above the second group of carbon fiber ropes at one time, and the second group of carbon fiber ropes are arranged below the first group of carbon fiber ropes at one time in a cross connection mode to form a mesh hollow.
According to the integrally woven coating crucible implemented in the application, the reticular body of the bowl bottom body, which is reticular and hollowed and woven, comprises at least two groups of carbon fiber ropes; the carbon fiber ropes are connected around the first group of carbon fiber ropes to form a compact shape, the first group of carbon fiber ropes radiating outwards from the circle center are connected above the second group of carbon fiber ropes surrounding the circular shape at one time, and the first group of carbon fiber ropes are connected below the second group of carbon fiber ropes surrounding the circular shape at one time in a cross mode to form a mesh hollow.
Owing to adopted above technical scheme, make the utility model discloses following advantage effect has:
firstly, the crucible is woven by adopting a straight carbon fiber rope, a blank does not need to be manufactured, the shape plasticity of the crucible is strong, the crucible is not limited by the blank, the crucible can be flexibly designed, the delivery period is shortened in batch production, and the material processing waste is less;
secondly, the surface of the crucible is subjected to surface treatment, so that corrosion can be effectively reduced, and the service life is prolonged;
thirdly, the crucible of the application is made of continuous fibers, has certain toughness, can be deformed properly along with the expansion and contraction of the quartz crucible, does not generate the same internal crack as the traditional crucible, and is beneficial to prolonging the service life of the crucible;
fourthly, the design of thin walls and hollowing is adopted, so that the infrared radiation heat can be more quickly transferred to the silicon material, the melting of the silicon is accelerated, the material melting time can be effectively shortened, and the working hours and the cost are saved; fifthly, the adopted braided crucible does not need post-machining, so that the use of raw materials can be greatly saved, and the manufacturing cost is reduced;
sixth, the weight of the braided crucible is reduced by more than 60%, so that the heat capacity can be reduced, the temperature rise and fall time can be shortened, and the energy consumption can be saved.
Of course, implementing any particular embodiment of the present disclosure does not necessarily have all of the above technical advantages at the same time.
Drawings
FIG. 1 is a schematic view of a crucible of the present application;
FIG. 2 is a schematic view of a carbon fiber braided tube;
FIG. 3 is one of the weaving diagrams;
FIG. 4 is a second schematic view of knitting;
FIG. 5 is a third schematic view of knitting;
FIG. 6 is a fourth schematic view of knitting;
FIG. 7 is a schematic view of another alternative weave construction of the present application;
FIG. 8 is a schematic view of a bowl bottom structure;
FIG. 9 is a schematic view of another angle of FIG. 8;
FIG. 10 is a schematic view of another structure of the bowl bottom body;
fig. 11 is a schematic view of another structure of the bowl bottom.
Detailed Description
For the purpose of understanding, the preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The core idea of the application is to make a crucible, which effectively improves and exceeds the service life of a traditional crucible, and the crucible is firstly woven into a prefabricated body by fibers, and the prefabricated body is a woven body without densification and hardening, and then the crucible is densified to obtain the hardened crucible. The densification hardening includes vapor deposition, liquid deposition, sintering, etc., which are well known technologies and will not be described herein. The structure of the crucible can be flexibly designed according to the actual design requirement without manufacturing a blank again, so that the cost can be effectively saved, the delivery time can be shortened, and the crucible can be produced in batch.
The present application will be described in detail below with reference to the accompanying drawings. Referring to fig. 1, an integral spiral woven crucible, which is shown for illustrative purposes only and is not intended to limit the present application, is applied to a carbon fiber composite material in a process of manufacturing single crystal silicon or polycrystalline silicon, and includes a mesh body woven by one or more carbon fiber ropes, and a hollow mesh body woven with an open upper end and a lower end. As described above, the crucible is first woven from fibers to form a preform, i.e., the overall spiral woven crucible preform in the present application, which will be referred to as a crucible preform in the following description.
The crucible preform is a reticular body formed by weaving one or more carbon fiber ropes, and the crucible preform is woven in a reticular hollow mode at the upper end and the lower end. The coating crucible which is integrally spirally woven and is made of the crucible preform is a reticular body which is formed by weaving one or more carbon fiber ropes, the crucible is a reticular hollow woven body with an opening at the upper end and a hollow-out lower end, a deposited carbon layer or a hardened substance layer is coated or filled between the carbon fiber surface (the surface of the hardened carbon fiber ropes is called as the carbon fiber surface), and the hardened substance can be silicon carbide, silicon nitride or other ceramics and the like.
Further, the crucible preform includes a body portion; the crucible body portion is including straight barrel, bowl body and bowl bottom body, crucible body portion includes a plurality of axial strips, and one or many carbon fiber rope winds axial strip spiral is woven, the axial strip with the contained angle that carbon fiber rope spiral woven the direction is less than 90 degrees for being greater than 70 degrees, the bowl bottom body is woven for netted fretwork.
In another embodiment, the crucible preform includes: the crucible body comprises a straight cylinder body, a bowl-shaped body and a bowl bottom body; the crucible body part comprises a plurality of axial strips, one or more carbon fiber ropes are spirally woven around the axial strips, the included angle between the axial strips and the spiral weaving direction of the carbon fiber ropes is more than 70 degrees and less than 90 degrees, and the upper edge sealing part and the crucible body part are woven and connected by one or more carbon fiber ropes; the bowl bottom body is a netted hollow woven structure.
The crucible of the present application is described below, comprising: an upper edge sealing portion 11 and a body portion formed by weaving one or more carbon fiber ropes 30 to be aligned obliquely with respect to a central axis, the body portion including a straight cylinder body 121, a bowl-shaped body 122, and a bowl-shaped bottom body 123. Each of the carbon fiber ropes 30 includes a plurality of carbon fiber yarns, the center of the rope is a carbon fiber yarn parallel to the axis of the rope, and the carbon fiber yarn parallel to the axis is coated with a carbon fiber braided tube 40, as shown in fig. 2.
The upper edge sealing part 11 is an annular body and is formed by weaving one or more carbon fiber ropes 30, and the weaving method of the upper edge sealing part 11 is different from that of the crucible body part; one weaving mode of the crucible body part is as follows: the crucible body portion includes a plurality of axial strips, the dictyosome of straight barrel 121 and bowl body 122 is wound by one or many carbon fiber rope axial strip spiral is woven, the axial strip with the contained angle that the direction was woven to the carbon fiber rope spiral is less than 90 degrees for being greater than 70 degrees, the bowl end body is woven for netted fretwork.
Referring to fig. 7, another weaving manner of the body portion is: in another embodiment of the straight cylinder 121 and bowl 122 of the present application, the crucible includes a body portion; the crucible body portion is including straight barrel, bowl body and bowl bottom body, straight barrel and bowl form body include a plurality of axial strip 50, one or many the carbon fiber rope winds axial strip spiral is woven, the axial strip with the contained angle that the direction was woven to the carbon fiber rope spiral is less than 90 degrees for being greater than 70 degrees, the bowl bottom body is woven for netted fretwork.
In this embodiment, as shown in fig. 7, the crucible has no upper edge sealing part, and can be supported at the lower opening of the spiral weaving without being scattered, the vertical axial strips 50 of the straight cylinder and the bowl-shaped body enhance the supporting strength in the height direction of the crucible, the circumferential strength of the crucible ring of the horizontal spiral weaving is increased, the upper and lower diameters are more accurate, the spiral weaving is adopted, the weaving is simpler, the manufacturing time is reduced, and the material cost and the use cost are greatly reduced, and the so-called spiral is a twisted curve like a spiral and a screw.
The axial strips 50 are one of carbon-carbon rods, graphite rods, high-temperature ceramic rods, high-temperature metal rods and carbon fiber ropes. The mesh bodies of the straight cylinder 121 and the bowl body 122 can secure high strength because the carbon fiber ropes 30 and the carbon fiber ropes 30 are interlaced with each other in a braid shape therebetween, and can firmly hold even a quartz crucible having a large weight. In addition, in the embodiment, the carbon fiber ropes 30 and the carbon fiber ropes 30 are aligned diagonally with respect to the central axis of the mesh body, rather than being aligned in the direction perpendicular to the central axis, and thus a structure having low rigidity in the circumferential direction is obtained. In view of this, even when a force expanding in the circumferential direction acts on the crucible due to the above-described reasons, the lattice formed by the carbon fiber ropes 30 and the carbon fiber ropes 30 is twisted, whereby the mesh body can be enlarged in the circumferential direction, and the expansion in the circumferential direction can be absorbed. Therefore, breakage of the carbon fiber is unlikely to occur, the shape is not largely lost, and thus the crucible has excellent shape stability.
Further, in the mesh body, the carbon fiber ropes 30 and the inclination angles of the carbon fiber ropes 30 with respect to the central axis may be appropriately changed depending on the rigidity required for each part of the crucible. The circumferential rigidity of the mesh body can be adjusted by changing the inclination angle, and thus the circumferential rigidity can be changed according to the use or according to each part of the mesh body.
The carbon fiber ropes 30 are each formed by bundling about several tens of thousands of carbon fibers. As the carbon fibers constituting the carbon fiber rope 30, pitch-based carbon fibers, PAN-based carbon fibers, viscose-based carbon fibers, or the like can be used. The carbon fibers that make up the carbon fiber rope 30 may be the same material or different materials.
The upper hem part 11 is knitted or woven, and as shown in fig. 3, 4, 5 and 6, the upper hem part 11 is formed by knitting one or more carbon fiber ropes 30 in various knitting manners.
Next, the bowl bottom body 123 is described, and in a first embodiment, as shown in fig. 8 and fig. 9, the mesh body of the bowl bottom body 123 includes one or more carbon fiber ropes partially radiating from the center of the circle and one or more carbon fiber ropes partially encircling the circle, when two portions of the carbon fiber ropes cross each other, the one or more carbon fiber ropes radiating from the center of the circle are positioned above the one or more carbon fiber ropes encircling the circle at one time, and are cross-connected below the one or more carbon fiber ropes encircling the circle at one time to form a mesh hollow. The term "mesh-like hollow" as used herein means that the carbon fiber ropes are not always close to each other, and a gap is intentionally left.
Referring to fig. 10, in a second embodiment, the net-shaped body of the bowl bottom 123 includes a first group of carbon fiber ropes and a second group of carbon fiber ropes; the carbon fiber ropes forming the first group of carbon fiber ropes are consistent in direction, and the carbon fiber ropes forming the second group of carbon fiber ropes are consistent in direction; the first group of carbon fiber ropes are arranged above the second group of carbon fiber ropes at one time, and the second group of carbon fiber ropes are arranged below the first group of carbon fiber ropes at one time in a cross connection mode to form a mesh hollow. The term "mesh-like hollow" as used herein means that the carbon fiber ropes are not always close to each other, and a gap is intentionally left.
In another embodiment, as shown in fig. 11, the net-shaped body of the bowl bottom body 123 includes at least two groups of carbon fiber ropes; the at least two groups of carbon fiber ropes are connected in a dense mode in a weaving mode. The dense state as referred to herein means a state in which the carbon fiber ropes are close to each other, and no void is intentionally left. As shown, the mesh body of the bowl bottom body 123 includes at least two groups of carbon fiber ropes; the carbon fiber ropes are connected around the first group of carbon fiber ropes to form a compact shape, the first group of carbon fiber ropes radiating outwards from the circle center are connected above the second group of carbon fiber ropes surrounding the circular shape at one time, and the first group of carbon fiber ropes are connected below the second group of carbon fiber ropes surrounding the circular shape at one time in a cross mode to form a mesh hollow. The term "mesh-like hollow" as used herein means that the carbon fiber ropes are not always close to each other, and a gap is intentionally left.
As described above, the three shapes of the net-shaped body of the bowl bottom 123 are not intended to limit the present invention, and the net-shaped body is formed in a woven manner.
In summary, in the spiral weaving mode, due to the existence of the axial strips, the upper sealing edge may be provided or not in terms of the requirement of the sealing edge.
Compared with the crucible in the prior art, the crucible of the application adopts carbon fiber composite's carbon fiber rope 30 to weave, need not make the idiosome, and the shape of crucible does not receive the restriction of idiosome, can design in a flexible way, because the raw materials specification is unified, can batch production, and production efficiency improves greatly moreover, shortens greatly in the crucible manufacturing process during labour time simultaneously, so the cost is lower, and delivery cycle is short, easily supplies.
Compared with the prior art, the method has the advantages and positive effects that the method adopts the technology as follows:
firstly, the crucible is woven by adopting a straight carbon fiber rope, a blank does not need to be manufactured, the shape plasticity of the crucible is strong, the crucible is not limited by the blank, the crucible can be flexibly designed, the delivery period is shortened in batch production, and the material processing waste is less;
secondly, the surface of the crucible is subjected to surface treatment, so that corrosion can be effectively reduced, and the service life is prolonged;
thirdly, the crucible of the application is made of continuous fibers, has certain toughness, can be deformed properly along with the expansion and contraction of the quartz crucible, does not generate the same internal crack as the traditional crucible, and is beneficial to prolonging the service life of the crucible;
fourthly, the design of thin walls and hollowing is adopted, so that the infrared radiation heat can be more quickly transferred to the silicon material, the melting of the silicon is accelerated, the material melting time can be effectively shortened, and the working hours and the cost are saved;
fifthly, the adopted braided crucible does not need post-machining, so that the use of raw materials can be greatly saved, and the manufacturing cost is reduced;
sixth, the weight of the braided crucible is reduced by more than 60%, so that the heat capacity can be reduced, the temperature rise and fall time can be shortened, and the energy consumption can be saved.
Of course, it is not necessary to implement any particular embodiment of the present invention to achieve all of the above technical effects at the same time.
The above disclosure is only for the preferred embodiment of the present invention, but not intended to limit itself, and those skilled in the art can make variations and changes equally without departing from the spirit of the present invention, and all such variations and changes are deemed to fall within the scope of the present invention.
Claims (8)
1. The integral spiral woven crucible preform is characterized in that the crucible preform is a net-shaped body formed by spirally weaving one or more carbon fiber ropes, and the crucible is a net-shaped hollow weave with an opening at the upper end and a hollowed weaving at the lower end;
the crucible preform comprises a crucible body part; the crucible body portion is including straight barrel, bowl body and bowl bottom body, crucible body portion includes a plurality of axial strips, and one or many carbon fiber rope winds axial strip spiral is woven, the axial strip with the contained angle that carbon fiber rope spiral woven the direction is less than 90 degrees for being greater than 70 degrees, the bowl bottom body is woven for netted fretwork.
2. The integrally spiral-woven crucible preform of claim 1, wherein the crucible preform comprises: and the upper edge sealing part is connected with the crucible body part through weaving of one or more carbon fiber ropes.
3. The utility model provides a coating crucible that whole spiral was woven, its characterized in that, the reticulation body that the crucible was woven by one or many carbon fiber rope spirals and is formed, the crucible is woven for the netted fretwork of upper end opening lower extreme, and carbon fiber rope's surface coating sinks carbon deposit layer or sclerosis thing layer, fills between the carbon fiber rope and sinks carbon deposit layer or sclerosis thing layer.
4. The integrally spiral-woven coated crucible of claim 3, wherein said crucible includes a body portion; the crucible body portion is including straight barrel, bowl body and bowl bottom body, crucible body portion includes a plurality of axial strips, and one or many carbon fiber rope winds axial strip spiral is woven, the axial strip with the contained angle that carbon fiber rope spiral woven the direction is less than 90 degrees for being greater than 70 degrees, the bowl bottom body is woven for netted fretwork.
5. The integrally spiral-woven coated crucible of claim 3, wherein said crucible comprises: the crucible body comprises a straight cylinder body, a bowl-shaped body and a bowl bottom body; the crucible body part comprises a plurality of axial strips, one or more carbon fiber ropes are spirally woven around the axial strips, the included angle between the axial strips and the spiral weaving direction of the carbon fiber ropes is more than 70 degrees and less than 90 degrees, and the upper edge sealing part and the crucible body part are woven and connected by one or more carbon fiber ropes; the bowl bottom body is a netted hollow woven structure.
6. The crucible as recited in claim 4 or 5, wherein the meshed hollowing-out woven mesh body of the bowl bottom body comprises one or more carbon fiber ropes partially radiating from the center of the circle and one or more carbon fiber ropes partially encircling the circle, and the one or more carbon fiber ropes radiating from the center of the circle are crossed and connected to form a meshed hollow-out structure above the one or more carbon fiber ropes encircling the circle at one time and below the one or more carbon fiber ropes encircling the circle at one time.
7. The integrally spiral-woven coated crucible of claim 4 or 5, wherein said bowl bottom mesh openwork-woven mesh comprises a first plurality of carbon fiber strands and a second plurality of carbon fiber strands; the carbon fiber ropes forming the first group of carbon fiber ropes are consistent in direction, and the carbon fiber ropes forming the second group of carbon fiber ropes are consistent in direction; the first group of carbon fiber ropes are arranged above the second group of carbon fiber ropes at one time, and the second group of carbon fiber ropes are arranged below the first group of carbon fiber ropes at one time in a cross connection mode to form a mesh hollow.
8. The integrally spiral-woven coating crucible of claim 4 or 5, wherein said bowl bottom body mesh openwork-woven mesh comprises at least two groups of carbon fiber strands; the carbon fiber ropes are connected around the first group of carbon fiber ropes to form a compact shape, the first group of carbon fiber ropes radiating outwards from the circle center are connected above the second group of carbon fiber ropes surrounding the circular shape at one time, and the first group of carbon fiber ropes are connected below the second group of carbon fiber ropes surrounding the circular shape at one time in a cross mode to form a mesh hollow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022349028.XU CN215103682U (en) | 2020-10-21 | 2020-10-21 | Integral spiral braided crucible preform and integral spiral braided coating crucible |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022349028.XU CN215103682U (en) | 2020-10-21 | 2020-10-21 | Integral spiral braided crucible preform and integral spiral braided coating crucible |
Publications (1)
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