Split combined quartz crucible mold

Abstract

A split-type combined quartz crucible mold comprises an inner shell formed by stacking a plurality of high-purity quartz ceramic parts, a water cooling circulation sleeve is sleeved on the outer surface of the inner shell, an exhaust gap is left between the water cooling circulation sleeve and the outer wall of the inner shell, vacuum holes connected to the exhaust gap are opened on the high-purity quartz ceramic parts, and a vacuum pipe connected to the exhaust gap is fixedly connected at the bottom of the water cooling circulation sleeve. The split-type combined quartz crucible mold provided in the present application is a split structure, which has the advantages of small expansion coefficient and good thermal shock resistance, is not easy to expand and deform at high temperature, and the high-purity quartz ceramic parts are made of high-purity silicon dioxide, which is in contact with the high-purity quartz sand used as the raw material of the crucible without pollution, and each mold has a long service life, which effectively reduces the production cost of the crucible.

Description

Technical Field

[0001] The invention relates to the technical field of crucible moulds, in particular to a split type combined quartz crucible mould. Background Art

[0002] With the development of solar energy, the technology of single crystal solar energy has developed particularly rapidly and has occupied a dominant position. The cost performance of solar single crystal production has also been greatly improved. The size of single crystal silicon crucible was more than 10 inches in the 1990s, and it has increased to more than 36-40 inches now. As the size of single crystal silicon crucible has gradually increased, the issue of single crystal silicon crucible production mold has gradually emerged.

[0003] At first, the material used for the single crystal silicon quartz crucible mold was graphite. The graphite mold was expensive and would oxidize and fall off at high temperatures to contaminate the high-purity quartz sand. However, the high-purity quartz sand produced had to be purified at a cost of about 8,000 yuan per ton after being contaminated. The graphite crucible mold was expensive and polluted. Later, all-metal was used as a large-size single crystal silicon quartz crucible mold, but this type of mold was also expensive and easily deformed at high temperatures. It would also react with high-purity quartz sand at high temperatures to cause contamination. The contaminated high-purity quartz sand was even more difficult to purify, and the mold was heavy and inconvenient to operate. Both of the above molds have the disadvantages of high cost and low cost-effectiveness. The contaminated high-purity quartz sand had to be purified at a cost of about 8,000 yuan per ton, which also increased environmental pollution a lot. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a split combined quartz crucible mold with good thermal shock resistance and no pollution in view of the deficiencies in the prior art.

[0005] The technical problem to be solved by the present invention is achieved by the following technical solutions. The present invention is a split combined quartz crucible mold, comprising an inner shell composed of a plurality of high-purity quartz ceramic parts, a water cooling circulation sleeve is arranged outside the inner shell, an air extraction gap is left between the water cooling circulation sleeve and the outer wall of the inner shell, vacuum holes connected to the air extraction gap are opened on the high-purity quartz ceramic parts, and a vacuum extraction pipeline connected to the air extraction gap is fixedly connected to the bottom of the water cooling circulation sleeve.

[0006] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the split combined quartz crucible mold described above, a plurality of support legs are fixedly installed at the bottom of the inner shell, and a support tube matching the support legs is welded at the bottom of the water cooling circulation sleeve. One end of the support tube extends into the air extraction gap, and the other end of the support tube extends to the outside of the water cooling circulation sleeve and is screwed with a sealing bolt. A support spring matching the support legs is also installed in the support tube.

[0007] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the split combined quartz crucible mold described above, the inner shell includes a disc-shaped member at the bottom, a cylindrical member in the middle and an annular member at the top. The disc-shaped member is an integral structure made of high-purity quartz ceramic parts, and the cylindrical member and the annular member are both petal-shaped structures formed by combining and stacking high-purity quartz ceramic parts.

[0008] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the split combined quartz crucible mold described above, ridges are arranged on the tops of the disc-shaped part and the cylindrical part, grooves are arranged on the bottoms of the cylindrical part and the annular part, ridges are arranged on one side of the high-purity quartz ceramic part constituting the cylindrical part and the high-purity quartz ceramic part constituting the annular part, and grooves are arranged on the other sides of the high-purity quartz ceramic part constituting the cylindrical part and the high-purity quartz ceramic part constituting the annular part.

[0009] The technical problem to be solved by the present invention can be further achieved by the following technical solution: for the split combined quartz crucible mold described above, the vacuum hole is conical, and the smaller end of the vacuum hole is arranged on the side close to the exhaust gap.

[0010] The technical problem to be solved by the present invention can be further achieved by the following technical solution: for the above-mentioned split combined quartz crucible mold, the vacuum holes are filled with quartz wool or quartz ceramic filter elements.

[0011] The technical problem to be solved by the present invention can also be further achieved by the following technical solution. For the split combined quartz crucible mold described above, the porosity of the high-purity quartz ceramic part is 5-15, the upper width of the exhaust gap is 30mm-50mm, and the bottom width of the exhaust gap is 100mm-150mm.

[0012] The technical problem to be solved by the present invention can be further achieved by the following technical solution. For the split combined quartz crucible mold described above, the high-purity quartz ceramic part uses high-purity silicon dioxide as the main raw material, and aggregate is added during molding.

[0013] The technical problem to be solved by the present invention can be further achieved by the following technical solution. For the split combined quartz crucible mold described above, the aggregate is any one or a combination of carbon fiber, quartz fiber or alumina fiber.

[0014] The technical problem to be solved by the present invention can also be further achieved by the following technical scheme. For the split combined quartz crucible mold described above, during actual production, high-purity silicon dioxide is customized according to the diameter of the inner shell, and the amount of aggregate added is determined according to the wall thickness of the inner shell. The high-purity silicon dioxide is made of 60-100 mesh, 100-200 mesh, and 200-300 mesh high-purity silicon dioxide for particle size grading, and the amount of aggregate added is 1-10% of the high-purity silicon dioxide.

[0015] Compared with the prior art, the mold provided by the present invention adopts a split structure and is composed of a plurality of high-purity quartz ceramic parts. It has the advantages of high temperature resistance, small expansion coefficient, good thermal shock resistance, and good heat insulation and thermal insulation performance. In addition, the high-purity quartz ceramic parts are made of high-purity silicon dioxide and are in contact with the high-purity quartz sand used as the raw material of the crucible without pollution. Each mold has a long service life, which effectively reduces the production cost of the crucible. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural schematic diagram of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the inner shell of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the disc-shaped member of the present invention;

[0019] Figure 4 It is a structural schematic diagram of the cylindrical member of the present invention;

[0020] Figure 5 It is a structural schematic diagram of the annular member of the present invention; DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Reference Figures 1 to 5A split combined quartz crucible mold comprises an inner shell 1 which is assembled and stacked by a plurality of high-purity quartz ceramic parts, a water cooling circulation sleeve 2 is sheathed on the outer surface of the inner shell 1, an exhaust gap 3 is left between the water cooling circulation sleeve 2 and the outer wall of the inner shell 1, vacuum holes 9 connected to the exhaust gap 3 are opened on the high-purity quartz ceramic parts, and a vacuum pipe 8 connected to the exhaust gap 3 is fixedly connected to the bottom of the water cooling circulation sleeve 2. The inner shell 1 is used to hold high-purity quartz sand used in the production of quartz crucibles. When the water cooling circulation sleeve 2 rotates, the high-purity quartz sand is centrifugally melted to obtain a quartz crucible. The shape of the inner shell 1 is consistent with the shape of the quartz crucible. The inner shell 1 is composed of a combination of high-purity quartz ceramic parts, which can alleviate expansion deformation under high temperature and is not easy to deform. The water cooling circulation sleeve 2 is used to cooperate with the inner shell 1, which is convenient for driving the inner shell 1 to rotate and can form an exhaust gap 3 between the inner shell 1. The vacuum hole 9 is used to make the high-purity quartz sand in the inner shell 1 adsorbed on the inner wall of the inner shell 1, thereby hot melting to form a quartz crucible. At the same time, cooling water can be circulated to perform cooling and temperature reduction treatment;

[0023] The inner shell 1 and the water cooling circulation jacket 2 are both provided with fixing holes at the top, so as to facilitate the fixing connection of the inner shell 1 and the water cooling circulation jacket 2 by fixing bolts;

[0024] In order to prevent the quartz sand in the inner shell 1 from entering the exhaust gap 3 from the vacuum hole 9, the vacuum hole 9 is filled with a breathable material such as quartz wool or a quartz ceramic filter element, which can block the quartz sand without affecting the vacuum process;

[0025] In actual application, the vacuum hole 9 can also be designed to be conical, with the smaller end of the vacuum hole 9 set on the side close to the exhaust gap 3, so that the vacuum hole 9 has a certain taper, making it difficult for breathable materials such as quartz wool or quartz ceramic filter elements to be sucked out from the vacuum place, thereby ensuring reliability.

[0026] A number of support legs 4 are fixedly installed at the bottom of the inner shell 1, and a support tube 5 matching the support legs 4 is welded at the bottom of the water cooling circulation sleeve 2. One end of the support tube 5 extends into the air extraction gap 3, and the other end of the support tube 5 extends to the outside of the water cooling circulation sleeve 2 and is screwed with a sealing bolt 7. A support spring 6 matching the support legs 4 is also installed in the support tube 5. When the inner shell 1 is placed in the water cooling circulation sleeve 2, the support legs 4 are inserted into the support tube 5, and the support spring 6 tightens and fixes the support legs 4 to achieve stable installation of the inner shell 1. At the same time, when the inner shell 1 is subsequently heated and expanded, the support spring 6 can also play a certain buffering role; a sealing gasket is also mounted on the sealing bolt 7 to seal the support tube 5. At the same time, the elastic force of the support spring 6 on the support leg 4 can be adjusted by setting the length of the sealing bolt 7 to better achieve the installation and fixation of the inner shell 1;

[0027] In practical application, a cylindrical guide isolation block can be further provided in the support tube 5 between the support spring 6 and the sealing bolt 7, which is convenient for the sealing bolt 7 to support the support spring 6 and can also play an isolation role in the support tube 5 to avoid direct contact between the sealing bolt 7 and the support spring 6, and to avoid deformation and damage of the sealing bolt 7 due to high temperature as much as possible; preferably, the guide isolation block is made of graphite material;

[0028] The inner shell 1 includes a disc-shaped part 10 at the bottom, a cylindrical part 12 in the middle, and an annular part 14 at the top. The disc-shaped part 10 is an integral structure made of high-purity quartz ceramic parts. The cylindrical part 12 and the annular part 14 are both petal-shaped structures made of a combination of high-purity quartz ceramic parts. The support legs 4 are arranged at the bottom of the disc-shaped part 10, and the number is 3-4, which are evenly distributed along the circumference of the disc-shaped part 10. The cylindrical part 12 and the annular part 14 are both petal-shaped structures, which can be divided into 3-4 petals, which is convenient for replacement and maintenance. When a petal of the high-purity quartz ceramic part is damaged, only the high-purity quartz ceramic part at that location needs to be replaced, and the entire part does not need to be replaced, which is conducive to reducing costs;

[0029] In order to improve the reliability of the connection and installation of the disc-shaped member 10, the cylindrical member 12 and the annular member 14, convex ridges 11 are provided on the tops of the disc-shaped member 10 and the cylindrical member 12, and grooves 13 are provided on the bottoms of the cylindrical member 12 and the annular member 14. The high-purity quartz ceramic member constituting the cylindrical member 12 and the high-purity quartz ceramic member constituting the annular member 14 are provided with convex ridges 11 on one side, and the high-purity quartz ceramic member constituting the cylindrical member 12 and the high-purity quartz ceramic member constituting the annular member 14 are provided with grooves 13 on the other side. When the inner shell 1 is assembled, the convex ridges 11 and the grooves 13 can be matched to realize the stacking of the disc-shaped member 10, the cylindrical member 12 and the annular member 14 to form an integral inner shell 1;

[0030] Preferably, the fixing hole on the inner shell 1 is arranged on the annular member 14;

[0031] The porosity of the high-purity quartz ceramic piece is 5-15, the upper width of the vacuum gap 3 is 30mm-50mm, the bottom width of the vacuum gap 3 is 100mm-150mm, the diameter of one end of the vacuum hole 9 is 10-30mm, and the diameter of the other end is 3-10mm. During actual production, the porosity of the high-purity quartz ceramic piece and the aperture size of the vacuum hole 9 are determined according to the diameter of the crucible mold.

[0032] The high-purity quartz ceramic part is made of high-purity silicon dioxide as the main raw material, and aggregate is added during molding. The aggregate is any one or a combination of carbon fiber, quartz fiber or alumina fiber. During actual production, the high-purity silicon dioxide is customized according to the diameter of the inner shell 1, and the amount of aggregate added is determined according to the wall thickness of the inner shell 1. The high-purity silicon dioxide used in the high-purity quartz ceramic part is made by grading the particle size of high-purity silicon dioxide with mesh sizes of 60-100, 100-200 and 200-300, and the amount of aggregate added is 1-10% of the high-purity silicon dioxide.

[0033] Of course, in specific applications, it is also possible not to add aggregates, and the temperature resistance, thermal shock resistance, expansion coefficient and other parameters of the inner shell 1 can be adjusted by adjusting the porosity of the high-purity quartz ceramic component.

[0034] When in use, first place the inner shell 1 into the water cooling circulation sleeve 2, assemble and code one side of the high-purity quartz ceramic parts constituting the inner shell 1, and fix the high-purity quartz ceramic parts by using the fixing holes and the support tube 5, then place the assembled inner shell 1 and the water cooling circulation sleeve 2 on the external rotating device, and put quartz sand for producing quartz crucible into the inner shell 1, then perform arc heat melting on the quartz sand, rotate the water cooling circulation sleeve 2 at the same time, and perform axial vacuum treatment on the exhaust gap 3 by using the vacuum pipe 8, so that the quartz sand is closely attached to the inner wall of the inner shell 1, and is heat-melted to form a quartz crucible;

[0035] Subsequently, the water cooling circulation sleeve 2 can be used to circulate cooling water to cool the quartz crucible;

[0036] At the same time, since the exhaust gap 3 is evacuated into a vacuum chamber, the heat preservation performance is good. Since the heat field of the arc quartz crucible is released from the inside to the outside, it can play a role in temperature leakage, and also reduce the temperature of the water cooling on the outside of the mold;

[0037] The high-purity quartz ceramic part is made of high-purity silicon dioxide, and it is in contact with the quartz sand used for the production of quartz crucibles at high temperatures without pollution. At the same time, the inner shell 1 is a split structure, which not only has a small expansion coefficient, but is also not easy to deform at high temperatures and can be used repeatedly. Moreover, if a part is damaged, only the part needs to be replaced without replacing the entire part, which is low in cost and is conducive to reducing the production cost of the quartz crucible.

Claims

1. A split combined quartz crucible mold, characterized in that: The invention comprises an inner shell formed by stacking a plurality of high-purity quartz ceramic parts, a water cooling circulation sleeve is arranged outside the inner shell, an air extraction gap is left between the water cooling circulation sleeve and the outer wall of the inner shell, vacuum holes connected to the air extraction gap are opened on the high-purity quartz ceramic parts, and a vacuum extraction pipeline connected to the air extraction gap is fixedly connected at the bottom of the water cooling circulation sleeve; A plurality of support legs are fixedly installed at the bottom of the inner shell, and a support pipe matching the support legs is welded at the bottom of the water cooling circulation jacket, one end of the support pipe extends into the air extraction gap, and the other end of the support pipe extends to the outside of the water cooling circulation jacket and is screwed with a sealing bolt, and a support spring matching the support legs is also installed in the support pipe; The inner shell comprises a disc-shaped part at the bottom, a cylindrical part in the middle and an annular part at the top. The disc-shaped part is an integral structure made of high-purity quartz ceramics, and the cylindrical part and the annular part are both petal-shaped structures formed by combining and stacking high-purity quartz ceramics.

2. The split combined quartz crucible mold according to claim 1, characterized in that: The tops of the disc-shaped member and the cylindrical member are provided with ridges, the bottoms of the cylindrical member and the annular member are provided with grooves, one side of the high-purity quartz ceramic member constituting the cylindrical member and the high-purity quartz ceramic member constituting the annular member are provided with ridges, and the other sides of the high-purity quartz ceramic member constituting the cylindrical member and the high-purity quartz ceramic member constituting the annular member are provided with grooves.

3. The split combined quartz crucible mold according to claim 1, characterized in that: The vacuum hole is in a cone shape, and the smaller end of the vacuum hole is arranged on a side close to the vacuum gap.

4. The split combined quartz crucible mold according to claim 1 or 3, characterized in that: The vacuum holes are filled with quartz wool or quartz ceramic filter elements.

5. The split combined quartz crucible mold according to claim 1, characterized in that: The porosity of the high-purity quartz ceramic piece is 5-15, the upper width of the exhaust gap is 30mm-50mm, and the bottom width of the exhaust gap is 100mm-150mm.

6. The split combined quartz crucible mold according to claim 1, characterized in that: The high-purity quartz ceramic part uses high-purity silicon dioxide as a main raw material, and aggregate is added during molding and manufacturing.

7. The split combined quartz crucible mold according to claim 6, characterized in that: The aggregate is any one of carbon fiber, quartz fiber or alumina fiber or a combination of several of them.

8. The split combined quartz crucible mold according to claim 6, characterized in that: In actual production, high-purity silica is customized according to the diameter of the inner shell, and the amount of aggregate added is determined according to the wall thickness of the inner shell. The high-purity silica is made of 60-100 mesh, 100-200 mesh, and 200-300 mesh high-purity silica for particle size grading, and the amount of aggregate added is 1-10% of the high-purity silica.

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