Forming device for high-strength quartz crucible and manufacturing method of high-strength quartz crucible

Abstract

A forming device for a high-strength quartz crucible comprises a forming rod which comprises a straight arm, a bottom arm, an R corner and a grab handle; the straight arm is perpendicular to the bottom arm; the R angle is positioned between the straight arm and the bottom arm and is used for connecting the straight arm and the bottom arm; the top end of the straight arm extends and bends to form a handle; the thimble is fixed at the end of the bottom arm; the forming plate is matched with and fixedly connected with the straight arm, the R angle and the bottom arm in shape; the first matching plate is rectangular and is arranged at the upper part of the straight arm, and the long edge of the first matching plate is detachably connected with the forming plate; the inner edge, close to the mold, of the second matching plate is arc-shaped and is matched with the R angle in shape; the top edge of the second matching plate is positioned on a critical plane of the straight arm and the R angle; and the second matching plate is detachably connected with the forming plate. The invention further provides a manufacturing method of the high-strength quartz crucible.

Description

Technical Field

[0001] The invention relates to the technical field of quartz crucible production, and in particular to a high-strength quartz crucible forming device and a high-strength quartz crucible manufacturing method. Background Art

[0002] The quartz crucible is a key component of the photovoltaic single crystal furnace and a consumable vessel for pulling large-diameter single crystal silicon. It is mainly used to hold molten silicon and make crystal rods required for subsequent processes. Therefore, during the use of the quartz crucible, its outer straight arm part will contact the graphite crucible. When in high-temperature contact, if the quartz crucible itself is not strong enough, the outer straight arm part of the quartz crucible will soften to a certain extent, causing bulging, edge collapse and other problems. In order to solve this problem, in the prior art, when making a quartz crucible, a high content of aluminum is added to the quartz sand material used to make the outer straight arm of the quartz crucible, which can ensure that the outer straight arm part of the quartz crucible is a high-strength layer, ensuring the strength and stability of the crucible during use.

[0003] In the existing process, the production of quartz crucibles is mainly carried out by melting using a high-temperature arc method. The process is as follows: before melting, the operator first puts the outer layer of quartz sand into a rotating molding mold that can be tilted at any angle, and then manually molds it using centrifugal force and a molding rod. Then, the middle layer and the inner layer are molded in sequence using quartz sand. Subsequently, the rotating device that has formed a crucible shape is rotated back to the electrode rod, the electrode rod is powered to start an arc, and is inserted into the mold cavity that has been formed, so that the quartz sand is quickly melted into the shape of a crucible, and finally taken out after cooling, thus completing the production of a quartz crucible blank. Since the outer straight arm part, i.e., the high-strength layer of quartz sand is formed in a rotary forming mold that can be tilted at any angle, during the process of adjusting the angle of the rotary forming mold, due to the centrifugal force, a small amount of the pre-loaded quartz sand will be thrown out of the mold port and to the bottom of the mold, resulting in less quartz sand, causing the thickness of the formed outer straight arm part, i.e., the high-strength layer of quartz sand to be uneven, and the contact surface with the middle layer to become uneven, resulting in uneven thickness of the high-strength layer of the finally formed quartz crucible, which reduces the strength of the quartz crucible and increases the risk of deformation during use. Summary of the invention

[0004] In view of this, it is necessary to provide a high-strength quartz crucible forming device and a high-strength quartz crucible manufacturing method that can improve the uniformity and consistency of the thickness of the high-strength layer of the quartz crucible.

[0005] According to one aspect of the present invention, a forming device for a high-strength quartz crucible is provided, comprising: a forming rod, an ejector pin, a forming plate, a first matching plate, and a second matching plate; wherein the forming rod comprises: a straight arm, a bottom arm, an R angle and a handle; the straight arm and the bottom arm are perpendicular to each other; the R angle is located between the straight arm and the bottom arm, and connects the straight arm and the bottom arm; the top end of the straight arm is extended and bent to form a handle; the ejector pin is fixed to the end of the bottom arm; the forming plate matches the shape of the straight arm, the R angle and the bottom arm and is fixedly connected; the first matching plate is rectangular and is arranged on the upper part of the straight arm, and the long side of the first matching plate is detachably connected to the forming plate; the inner side of the second matching plate close to the mold is arc-shaped and matches the shape of the R angle; the top edge of the second matching plate is located at the critical surface of the straight arm and the R angle; the second matching plate is detachably connected to the forming plate.

[0006] Preferably, the overlapping portion of the forming plate and the straight arm is provided with scales along the length direction.

[0007] Preferably, a plurality of first fixing holes are evenly arranged along the length direction at the overlapping portion of the forming plate and the straight arm; a plurality of second fixing holes are evenly arranged on the first matching plate along the length direction; the spacing between adjacent first fixing holes is the same as the spacing between adjacent second fixing holes; the first matching plate is detachably connected to the forming plate by connecting bolts, and the first fixing holes and the second fixing holes.

[0008] Preferably, the second fixing hole is waist-shaped along the width direction of the first matching plate.

[0009] Preferably, two third fixing holes are provided at the portion where the forming plate overlaps with the R angle; two fourth fixing holes are provided on the second matching plate along the length direction; the spacing between the two third fixing holes is the same as the spacing between the two fourth fixing holes; the second matching plate is detachably connected to the forming plate through connecting bolts, and the third fixing holes and the fourth fixing holes.

[0010] Preferably, the fourth fixing hole is waist-shaped along the width direction of the second matching plate.

[0011] According to another aspect of the present invention, a method for manufacturing a high-strength quartz crucible is provided. The molding process of the high-strength layer of quartz sand in the straight arm portion of the outer layer of the crucible adopts any of the above-mentioned molding devices for high-strength quartz crucibles, and comprises the following steps: S0, mixing and forming device; S1. Adjust the mold speed and inclination, including: S10, adjust the mold inclination angle to 90 degrees; S11, evenly placing high-strength layer quartz sand into the mold liner; S12, adjust the mold speed to 70-80r / min; S13, adjusting the mold inclination angle to 70-80 degrees according to the preset inclination angle adjustment range; S2, sand scraping molding, including: S21, inserting the ejector pin of the prepared molding device into the positioning hole of the mold; S22, using the prepared molding device, cooperating with the rotation of the mold, to scrape and mold the high-strength layer of quartz sand; S23, molding is completed, and the high-strength layer of quartz sand is uniformly and evenly distributed on the straight arm part of the mold liner.

[0012] Preferably, step S0 specifically includes the following steps: S00, fixing the forming plate to the forming rod; S01. According to the height of the straight arm of the quartz crucible and with reference to the scale on the forming plate, determine the position of the first fixing hole to be connected with the second fixing hole, and then determine the position of the first matching plate in the length direction of the forming plate; S02, according to the thickness of the high-strength layer of quartz sand, adjusting the position of the waist-shaped second fixing hole along the width direction of the forming plate, thereby determining the connection position of the first matching plate and the forming plate, and fixing the first matching plate to the forming plate; S03. According to the thickness of the high-strength layer of quartz sand, adjust the position of the waist-shaped fourth fixing hole along the width direction of the forming plate, and then determine the connection position of the second matching plate and the forming plate, and fix the second matching plate to the forming plate.

[0013] Preferably, the preset tilt angle adjustment range is 2 degrees.

[0014] The above-mentioned high-strength quartz crucible molding device and high-strength quartz crucible manufacturing method improve the consistency and uniformity of the high-strength layer of quartz sand in the molding process of the quartz crucible by the following technical means: first, when the high-strength layer of quartz sand is placed in the mold, the mold rotation speed is adjusted to 70-80r / min. Under this rotation speed range, the quartz sand will not fall to the bottom of the mold; secondly, according to the preset inclination adjustment range, the mold inclination angle is adjusted to 70-80 degrees. When the adjustment is completed, the quartz sand will not slide to the bottom of the mold and will not be thrown out of the mold port; finally, through the first setting on the molding device The first matching plate and the second matching plate limit the high-strength layer quartz sand between the first matching plate and the second matching plate during the molding process, and cooperate with the mold rotation speed and inclination angle to further ensure that the high-strength quartz sand placed in the mold will not be thrown out of the mold port and slide down the bottom of the mold during the molding process, and will only be molded in the straight arm part; since the total amount of the high-strength layer quartz sand placed will not be reduced, the thickness uniformity and consistency of the high-strength layer quartz sand after molding are improved, thereby improving the thickness uniformity and consistency of the high-strength layer of the finally prepared quartz crucible, and improving the quality of the quartz crucible. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the forming device for high-strength quartz crucible in the present invention.

[0016] Figure 2 The figure is a flow chart of the method for making a high-strength quartz crucible of the present invention.

[0017] Figure 3 Schematic diagram of the aluminum content on the outer surface of the quartz crucible obtained in the comparative example of the present invention.

[0018] Figure 4 Schematic diagram of the aluminum content on the outer surface of the quartz crucible obtained in Example 1 of the present invention.

[0019] Figure 5 Schematic diagram of the aluminum content on the outer surface of the quartz crucible obtained in Example 2 of the present invention.

[0020] Figure 6 Schematic diagram of the aluminum content on the outer surface of the quartz crucible obtained in Example 3 of the present invention.

[0021] In the figure: forming rod 1; straight arm 10; bottom arm 11; R angle 12; handle 13; ejector pin 2; forming plate 3; first fixing hole 30; first matching plate 4; second fixing hole 40; second matching plate 5; fourth fixing hole 50. DETAILED DESCRIPTION

[0022] The technical solutions and technical effects of the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings of the present invention.

[0023] Please see Figure 1 As shown, a specific embodiment of the present invention provides a forming device for a high-strength quartz crucible, comprising: a forming rod 1, an ejector pin 2, a forming plate 3, a first matching plate 4, and a second matching plate 5; wherein the forming rod 1 comprises: a straight arm 10, a bottom arm 11, an R angle 12 and a handle 13; the straight arm 10 and the bottom arm 11 are perpendicular to each other; the R angle 12 is located between the straight arm 10 and the bottom arm 11, and connects the straight arm 10 and the bottom arm 11; the top end of the straight arm 10 is extended and bent to form a handle 13; the ejector pin 2 is fixed to the end of the bottom arm 11; the forming plate 3 matches the shape of the straight arm 10, the R angle 12 and the bottom arm 11 and is fixedly connected; the first matching plate 4 is rectangular and is arranged on the upper part of the straight arm 10, and the long side of the first matching plate 4 is detachably connected to the forming plate 3; the inner side of the second matching plate 5 close to the mold is arc-shaped and matches the shape of the R angle 12; the top edge of the second matching plate 5 is located at the critical surface of the straight arm 10 and the R angle 12; the second matching plate 5 is detachably connected to the forming plate 3.

[0024] In this embodiment, by setting the first matching plate 4, when the high-strength layer quartz sand is formed, the first matching plate 4 is set above the high-strength layer quartz sand of the straight arm 10, that is, the port position of the quartz crucible to be obtained, to ensure that the high-strength layer quartz sand is not thrown out of the port during the forming process, to ensure that the total amount of the high-strength layer quartz sand is not reduced, and to avoid the uneven thickness caused by the reduction of the total amount of the high-strength layer quartz sand; By setting the second matching plate 5, when the high-strength layer quartz sand is formed, the second matching plate 5 is set at the R angle 12 part below the straight arm 10 part of the high-strength layer quartz sand, ensuring that the high-strength layer quartz sand does not slide down the bottom of the mold during the forming process, ensuring that the total amount of the high-strength layer quartz sand does not decrease, and avoiding the uneven thickness caused by the reduction of the total amount of the high-strength layer quartz sand; By cooperating with the first matching plate 4 and the second matching plate 5, the high-strength quartz sand is confined to the straight arm 10 part during the molding process, and will not be thrown out of the crucible port and slide down the bottom of the mold, thereby ensuring that the total amount of high-strength layer quartz sand pre-placed in the mold will not be reduced, and through the scraping and molding of the molding plate 3, the uniformity and consistency of the thickness of the high-strength layer quartz sand is ensured.

[0025] For further information, see Figure 1 As shown, in order to facilitate adjustment, the overlapping portion of the forming plate 3 and the straight arm 10 is provided with scales along the length direction.

[0026] Through this arrangement, during the molding process, it is convenient to adjust the positions of the first matching plate 4 and the second matching plate 5 according to the height requirements of the straight arm 10 of the manufactured crucible.

[0027] For further information, see Figure 1 As shown, in order to improve the applicability of the forming device and facilitate maintenance, a plurality of first fixing holes 30 are evenly provided along the length direction at the overlapping portion of the forming plate 3 and the straight arm 10; a plurality of second fixing holes 40 are evenly provided along the length direction on the first matching plate 4; the spacing between adjacent first fixing holes 30 is the same as the spacing between adjacent second fixing holes 40; the first matching plate 4 is detachably connected to the forming plate 3 by connecting bolts, and the first fixing holes 30 and the second fixing holes 40.

[0028] Through this arrangement, during the molding process, it is convenient to adjust the position of the first matching plate 4 according to the height requirement of the straight arm 10 of the manufactured crucible; at the same time, it is convenient to repair the first matching plate 4 during use.

[0029] For further information, see Figure 1 As shown, in order to improve the applicability of the forming device, the second fixing hole 40 is waist-shaped along the width direction of the first matching plate 4.

[0030] Through this arrangement, the position of the first matching plate 4 on the width of the forming plate 3 can be adjusted according to the thickness of the high-strength quartz sand layer to be formed, so as to meet various crucible manufacturing requirements.

[0031] For further information, see Figure 1As shown, in order to facilitate the maintenance of the second matching plate 5, two third fixing holes (not shown in the figure) are opened at the overlapping portion of the forming plate 3 and the R angle 12; two fourth fixing holes 50 are opened on the second matching plate 5 along the length direction; the spacing between the two third fixing holes (not shown in the figure) is the same as the spacing between the two fourth fixing holes 50; the second matching plate 5 is detachably connected to the forming plate 3 by connecting bolts, and the third fixing holes (not shown in the figure) and the fourth fixing holes 50.

[0032] For further information, see Figure 1 As shown, in order to improve the applicability of the forming device, the fourth fixing hole 50 is waist-shaped along the width direction of the second matching plate 5 .

[0033] Through this arrangement, the position of the second matching plate 5 on the width of the forming plate 3 can be adjusted according to the thickness of the high-strength quartz sand layer to be formed, so as to meet various crucible manufacturing requirements.

[0034] Please see Figure 2 As shown, the specific embodiment of the present invention further provides a method for manufacturing a high-strength quartz crucible. The molding process of the high-strength quartz sand of the outer straight arm 10 of the crucible adopts any of the above-mentioned high-strength quartz crucible molding devices, including the following steps: S0, mixing and forming device; S1. Adjust the mold speed and inclination, including: S10, adjust the mold inclination angle to 90 degrees; S11, evenly placing high-strength layer quartz sand into the mold liner; S12, adjust the mold speed to 70-80r / min; S13, adjusting the mold inclination angle to 70-80 degrees according to the preset inclination angle adjustment range; S2, sand scraping molding, including: S21, inserting the ejector pin 2 of the prepared molding device into the positioning hole of the mold; S22, using the prepared molding device, cooperating with the rotation of the mold, to scrape and mold the high-strength layer of quartz sand; S23, molding is completed, and the high-strength layer of quartz sand is uniformly and evenly distributed on the straight arm 10 of the mold liner.

[0035] Furthermore, step S0 specifically includes the following steps: S00, fixing the forming plate 3 to the forming rod 1; S01. According to the height of the straight arm 10 of the quartz crucible and with reference to the scale on the forming plate 3, determine the position of the first fixing hole 30 that needs to be connected to the second fixing hole 40, and then determine the position of the first matching plate 4 in the length direction of the forming plate 3; S02, according to the thickness of the high-strength layer of quartz sand, adjust the position of the waist-shaped second fixing hole 40 along the width direction of the forming plate 3, and then determine the connection position of the first matching plate 4 and the forming plate 3, and fix the first matching plate 4 to the forming plate 3; S03. According to the thickness of the high-strength layer of quartz sand, adjust the position of the waist-shaped fourth fixing hole 50 along the width direction of the forming plate 3, and then determine the connection position of the second matching plate 5 and the forming plate 3, and fix the second matching plate 5 to the forming plate 3.

[0036] In the above settings, the reference of the mold inclination angle is the vertical direction of the ground; when the mold speed is adjusted to 70-80r / min, the quartz sand will not fall to the bottom of the mold; when the mold inclination angle is adjusted to 70-80 degrees, the quartz sand will not slide to the bottom of the mold within 2 minutes, and the quartz sand will not be thrown out of the port.

[0037] Furthermore, the preset tilt angle adjustment range is 2 degrees.

[0038] The effects of the present invention are described below in conjunction with comparative examples and embodiments.

[0039] Comparative Example A quartz crucible is prepared by using a molding device without the first matching plate 4 and the second matching plate 5 and a molding method of a high-strength layer in the prior art; Example 1

[0040] The quartz crucible is prepared by using the high-strength quartz crucible forming device provided by the present invention and the high-strength quartz crucible manufacturing method provided by the present invention, wherein the mold rotation speed is 70r / min and the mold inclination angle is 70 degrees; Example 2

[0041] The high-strength quartz crucible molding device provided by the present invention and the high-strength quartz crucible manufacturing method provided by the present invention are used to prepare the quartz crucible, wherein the mold rotation speed is 75r / min and the mold inclination angle is 75 degrees; Example 3

[0042] The quartz crucible is prepared by using the high-strength quartz crucible forming device provided by the present invention and the high-strength quartz crucible manufacturing method provided by the present invention, wherein the mold rotation speed is 80r / min and the mold inclination angle is 80 degrees; The Al content of the straight arm and R-angle outer surface of the quartz crucible prepared in the above comparative example and Examples 1-3 was tested at intervals of 50 mm from the port to the R-angle position. The results are as follows: Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown in the figure, measuring points 1 to 6 are distributed to the straight arm part of the quartz crucible, that is, the high-strength layer part, and measuring points 7 and 8 are distributed at the R corner part of the crucible.

[0043] Depend on Figure 3 It can be seen that the Al content distribution of the straight arm part of the quartz crucible made by the prior art is undulating, which means that the thickness distribution of the high-strength layer in the straight arm part of the crucible is uneven. In the part with less Al content, the thickness of the high-strength layer is thinner, so the quartz sand in the middle layer in contact with it fills it, resulting in less Al in this part. Figure 4-6 It can be seen that the quartz crucible made by the technology of the present invention has a straight arm part, that is, a high-strength layer, and the positions of measuring points 1-6. As the rotation speed of the mold increases and the inclination angle increases, the distribution of Al content becomes more and more uniform, which means that the thickness of the high-strength layer becomes more and more uniform and does not show the characteristics of uneven concave and convex intervals; therefore, compared with the prior art, the present invention improves the thickness uniformity and consistency of the high-strength layer quartz sand after molding, thereby improving the thickness uniformity and consistency of the high-strength layer of the quartz crucible finally prepared, and improving the quality and quality of the quartz crucible.

[0044] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A high-strength quartz crucible forming device, characterized in that: include: A forming rod, an ejector pin, a forming plate, a first matching plate, and a second matching plate; wherein the forming rod comprises: a straight arm, a bottom arm, an R angle and a handle; the straight arm and the bottom arm are perpendicular to each other; the R angle is located between the straight arm and the bottom arm to connect the straight arm and the bottom arm; the top end of the straight arm is extended and bent to form a handle; the ejector pin is fixed to the end of the bottom arm; the forming plate matches the shape of the straight arm, the R angle and the bottom arm and is fixedly connected; the first matching plate is rectangular and is arranged on the upper part of the straight arm, and the long side of the first matching plate is detachably connected to the forming plate; the inner side of the second matching plate close to the mold is arc-shaped and matches the shape of the R angle; the top edge of the second matching plate is located at the critical surface of the straight arm and the R angle; the second matching plate is detachably connected to the forming plate.

2. The high-strength quartz crucible forming device according to claim 1, characterized in that: The overlapping portion of the forming plate and the straight arm is provided with scales along the length direction.

3. The high-strength quartz crucible forming device according to claim 1, characterized in that: A plurality of first fixing holes are evenly arranged along the length direction at the overlapping portion of the forming plate and the straight arm; a plurality of second fixing holes are evenly arranged on the first matching plate along the length direction; the spacing between adjacent first fixing holes is the same as the spacing between adjacent second fixing holes; the first matching plate is detachably connected to the forming plate through connecting bolts, and the first fixing holes and the second fixing holes.

4. The high-strength quartz crucible forming device according to claim 3, characterized in that: The second fixing hole is waist-shaped along the width direction of the first matching plate.

5. The high-strength quartz crucible forming device according to claim 1, characterized in that: Two third fixing holes are provided at the position where the forming plate overlaps with the R angle; two fourth fixing holes are provided on the second matching plate along the length direction; the spacing between the two third fixing holes is the same as the spacing between the two fourth fixing holes; the second matching plate is detachably connected to the forming plate through connecting bolts, the third fixing holes and the fourth fixing holes.

6. The high-strength quartz crucible forming device according to claim 5, characterized in that: The fourth fixing hole is waist-shaped along the width direction of the second matching plate.

7. A method for manufacturing a high-strength quartz crucible, characterized in that: The molding process of the high-strength layer of quartz sand of the straight arm portion of the outer layer of the crucible adopts the molding device for the high-strength quartz crucible as claimed in any one of claims 1 to 6, comprising the following steps: S0, mixing and forming device; S1. Adjust the mold speed and inclination, including: S10, adjust the mold inclination angle to 90 degrees; S11, evenly placing high-strength layer quartz sand into the mold liner; S12, adjust the mold speed to 70-80r / min; S13, adjusting the mold inclination angle to 70-80 degrees according to the preset inclination angle adjustment range; S2, sand scraping molding, including: S21, inserting the ejector pin of the prepared molding device into the positioning hole of the mold; S22, using the prepared molding device, cooperating with the rotation of the mold, to scrape and mold the high-strength layer of quartz sand; S23, molding is completed, and the high-strength layer of quartz sand is uniformly and evenly distributed on the straight arm part of the mold liner.

8. The method for manufacturing a high-strength quartz crucible according to claim 7, characterized in that: Step S0 specifically includes the following steps: S00, fixing the forming plate to the forming rod; S01. According to the height of the straight arm of the quartz crucible and with reference to the scale on the forming plate, determine the position of the first fixing hole to be connected with the second fixing hole, and then determine the position of the first matching plate in the length direction of the forming plate; S02, according to the thickness of the high-strength layer of quartz sand, adjusting the position of the waist-shaped second fixing hole along the width direction of the forming plate, thereby determining the connection position of the first matching plate and the forming plate, and fixing the first matching plate to the forming plate; S03. According to the thickness of the high-strength layer of quartz sand, adjust the position of the waist-shaped fourth fixing hole along the width direction of the forming plate, and then determine the connection position of the second matching plate and the forming plate, and fix the second matching plate to the forming plate.

9. The method for manufacturing a high-strength quartz crucible according to claim 7, characterized in that: The preset tilt adjustment is 2 degrees.

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