A crucible with high thermal performance and its preparation process

Abstract

The present invention discloses a crucible with high thermal deformation performance and a preparation process thereof, comprising a crucible main body, wherein the outer wall of the crucible main body is integrally formed with a first protrusion and a second protrusion, the upper surface of the first protrusion is flush with the upper surface of the crucible main body, the second protrusion is located below the first protrusion, a plurality of arc-shaped protrusions are integrally formed on the side opposite to the first protrusion and the second protrusion, and the upper surface of the crucible main body is provided with a notch; the crucible main body of the present invention is mainly made of aluminum oxide, silicon dioxide, iron oxide, ball clay, coke and blue spinel powder as raw materials through a mold to make a pot body; by using aluminum oxide, silicon dioxide and iron oxide as aggregate clinker, the high-temperature resistance of the crucible main body can be effectively improved, and the density and mechanical strength of the crucible main body can be significantly enhanced, which has a significant effect, and to a certain extent reduces the probability of deformation of the crucible main body when heated at high temperature for a long time.

Description

Technical Field

[0001] The invention belongs to the technical field of crucible preparation, and in particular relates to a crucible with high thermal change performance and a preparation process thereof. Background Art

[0002] A crucible is a vessel or melting pot made of extremely refractory materials (such as clay, graphite, porcelain clay, quartz, or the more difficult-to-melt metal iron). A crucible is a deep, bowl-shaped ceramic container. It is essential when heating solids over high heat, as it can withstand higher temperatures than glassware. The crucible lid is typically placed at an angle to prevent the heated material from escaping and to allow air to flow freely for possible oxidation reactions. Because the crucible has a small base, it typically needs to be placed on a clay tripod to be heated directly over a flame.

[0003] A search revealed a Chinese patent application numbered 201710822379.8, which discloses a crucible and a method for preparing the same. The crucible comprises: a crucible body, including a bottom wall and side walls; a first coating applied to the bottom and side walls to prevent metallic impurities from diffusing into the crystal grains within the crucible body; a second coating applied to the side walls outside the first coating to assist in nucleation of the crystal grains within the crucible body; and a third coating applied to the bottom wall outside the first coating to assist in detaching the crystals within the crucible body. The crucible of this invention effectively reduces the diffusion of metallic impurities from the crucible body into the polycrystalline crystals within the crucible body, resulting in high-purity polycrystalline silicon.

[0004] However, this invention still has the following defects:

[0005] The crucible has unsatisfactory thermal deformation performance and will deform when heated at high temperature for a long time, thus affecting the use of the crucible. In addition, the crucible does not have a limiting function, and there is a risk of slipping when the crucible is clamped and transferred by the crucible tongs, posing a certain safety hazard. Summary of the Invention

[0006] The object of the present invention is to provide a crucible with high thermal stability and a preparation process thereof, so as to solve the problems in the prior art mentioned in the above background art that the working efficiency is low and a large amount of manpower is wasted.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A crucible with high thermal deformation performance includes a crucible body, the outer wall of the crucible body is integrally formed with a first protrusion and a second protrusion, the upper surface of the first protrusion is flush with the upper surface of the crucible body, the second protrusion is located below the first protrusion, and a plurality of arc-shaped protrusions are integrally formed on the opposite side of the first protrusion and the second protrusion. The upper surface of the crucible body is provided with a notch, one end of the notch extends to the side wall of the first protrusion, the inner wall of the crucible body is coated with a protective layer, the crucible body is mainly made of aluminum oxide, silicon dioxide, iron oxide, ball clay, coke and blue spinel powder as raw materials through a mold, the mold includes an upper mold, a middle mold and a lower mold, the middle mold is located between the upper mold and the lower mold, and a guide mechanism is provided between the middle mold and the upper mold and the lower mold.

[0009] Preferably, the lower mold is provided with a second mold cavity for forming the crucible body and the second protrusion, and the upper and lower sides of the middle mold are respectively provided with first mold cavities for forming the first protrusion and the second protrusion convex points, and the interior of the first mold cavity is provided with grooves corresponding to the multiple convex points.

[0010] Preferably, the lower surface of the upper mold is provided with a third mold cavity for forming the first protrusion, and the first mold block and the second mold block are fixed inside the third mold cavity. The diameter of the first mold block corresponds to the inner diameter of the crucible body, and the shape of the second mold block corresponds to the shape of the notch.

[0011] Preferably, the middle mold includes a left mold and a right mold arranged in a semicircular shape, one side of the left mold is detachably connected to one side of the right mold, and the left mold and the right mold form a complete circular ring shape.

[0012] Preferably, the guide mechanism includes a plurality of positioning columns, the upper outer wall of the lower mold is integrally formed with an annular protrusion, and the upper surface of the protrusion is flush with the upper surface of the crucible body, and the plurality of positioning columns are fixed at equal angles around the upper surface of the protrusion, and the upper mold and the middle mold are both provided with positioning holes for one end of the positioning column to pass through.

[0013] Based on the above-described crucible with high thermal stability, the present invention further provides a process for preparing a crucible with high thermal stability, comprising the following steps:

[0014] S1. Prepare the following raw materials by mass: 30-48 parts of aluminum oxide, 60-70 parts of silicon dioxide, 5-7 parts of ferric oxide, 20-30 parts of ball clay, 30-40 parts of cooked coke, and 2-3 parts of kyanite powder;

[0015] S2. Dry-mix the raw materials in S1 using a blender, and after mixing evenly, add water for wet mixing to obtain a muddy raw material;

[0016] S3. Evenly apply the mud material to the interior of the lower mold until the mud material covers the side walls of the second mold cavity of the lower mold. Then, install the middle mold on the upper end of the lower mold and continue applying the mud material until the side walls of the second mold cavity and the side walls of the first mold cavity are covered with the mud material.

[0017] S4. The upper mold is driven by a lifting mechanism to combine with the middle mold and the lower mold for molding. At this time, the first molding block passes through the middle mold and is located inside the second mold cavity. The second molding block is located in the second mold cavity. The excess muddy raw material is molded into the third mold cavity to obtain a primary embryo.

[0018] S5. Drying and dehydrating the embryo together with the mold to remove moisture from the embryo to obtain a hard embryo body;

[0019] S6, demolding the hard embryo from the mold, and transferring the demolded hard embryo to a firing kiln for firing and forming to obtain a blank;

[0020] S7. Coat the surface and interior of the blank with a protective layer, and dry naturally to obtain a finished crucible.

[0021] Preferably, in step S1, the following raw materials are prepared by mass: 30 parts of aluminum oxide, 60 parts of silicon dioxide, 5 parts of iron oxide, 20 parts of ball clay, 30 parts of cooked coke, and 2 parts of kyanite fine powder.

[0022] Preferably, when demolding the hard embryo in step S6, the upper mold is first separated from the middle mold and the lower mold, and then the middle mold and the hard embryo are taken out from the lower mold together, and finally the hard embryo is separated from the middle mold. The hard embryo after demolding needs to be trimmed, and the protrusions and burrs are scraped off before firing.

[0023] Preferably, when the hard blank is fired, the hard blank is transferred to a firing kiln for firing. During the firing process, the temperature of the firing kiln is increased to 35°C every 8 hours for 180 hours. The starting temperature of the firing kiln is 40°C. After the firing is completed, the firing kiln stops heating and keeps warm for 3 hours. After the insulation is completed, the blank is taken out.

[0024] Preferably, the protective layer in step S7 is configured as an anti-oxidation coating, and the thickness of the protective layer coating is 0.1-0.2 mm.

[0025] The crucible with high thermal stability and its preparation process proposed in the present invention have the following advantages over the prior art:

[0026] 1. The crucible body of the present invention is mainly made of aluminum oxide, silicon dioxide, iron oxide, ball clay, coke and kyanite fine powder as raw materials and is made into a pot body through a mold. By using aluminum oxide, silicon dioxide and iron oxide as aggregate clinker, the high temperature resistance of the crucible body can be effectively improved, and the density and mechanical strength of the crucible body can be significantly enhanced, which has a significant effect on reducing the probability of deformation of the crucible body when heated at high temperature for a long time.

[0027] 2. The present invention provides a first protrusion and a second protrusion on the outer wall of the high crucible body, which can limit the position of the crucible when it is clamped by the pliers, and a plurality of protrusions are provided on the opposite side of the first protrusion and the second protrusion to increase the friction between the crucible pliers and the first protrusion and the second protrusion, thereby reducing the probability of the crucible body slipping and improving the safety of the crucible in use to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the crucible structure of the present invention;

[0029] Figure 2 Schematic diagram of the cross section of the crucible of the present invention;

[0030] Figure 3 This is a schematic diagram of the mold structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the mold explosion structure of the present invention;

[0032] Figure 5 Schematic diagram of the upper mold structure of the present invention;

[0033] Figure 6 It is a structural schematic diagram of the middle mold assembly of the present invention.

[0034] In the figure: 1. crucible body; 2. first protrusion; 3. notch; 4. second protrusion; 5. upper mold; 6. middle mold; 601. left mold; 602. right mold; 7. lower mold; 8. protrusion; 9. positioning column; 10. first mold cavity; 11. first mold block; 12. second mold block; 13. third mold cavity; 14. second mold cavity. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] The present invention provides Figure 1-2 The crucible shown has high thermal deformation performance, includes a crucible body 1, the outer wall of the crucible body 1 is integrally formed with a first protrusion 2 and a second protrusion 4, the upper surface of the first protrusion 2 is flush with the upper surface of the crucible body 1, and the second protrusion 4 is located below the first protrusion 2, and the first protrusion 2 and the second protrusion 4 are integrally formed with a plurality of arc-shaped protrusions on the opposite side, the upper surface of the crucible body 1 is provided with a notch 3, one end of the notch 3 extends to the side wall of the first protrusion 2, and the inner wall of the crucible body 1 is coated with a protective layer, the crucible body 1 is mainly made of aluminum oxide, silicon dioxide, iron oxide, ball clay, coke and blue stone fine powder as raw materials through a mold, and aluminum oxide, silicon dioxide and iron oxide are used as aggregate clinker, which can effectively improve the high temperature resistance of the crucible body, and has a significant effect on enhancing the density and mechanical strength of the crucible body, and to a certain extent reduces the probability of deformation of the crucible body when heated at high temperature for a long time.

[0038] like Figure 3-6 As shown, the mold includes an upper mold 5, a middle mold 6 and a lower mold 7. The middle mold 6 is located between the upper mold 5 and the lower mold 7, and a guide mechanism is provided between the middle mold 6 and the upper mold 5 and the lower mold 7;

[0039] The lower mold 7 is provided with a second mold cavity 14 for forming the crucible body 1 and the second protrusion 4, and the upper and lower sides of the middle mold 6 are respectively provided with first mold cavities 10 for forming the convex points on the first protrusion 2 and the second protrusion 4, and the interior of the first mold cavity 10 is provided with grooves corresponding to multiple convex points. The cooperation of the first protrusion 2 and the second protrusion 4 can limit the position of the crucible clamp when clamping, and a plurality of convex points are provided on the opposite side of the first protrusion 2 and the second protrusion 4, which increases the friction between the crucible clamp and the first protrusion 2 and the second protrusion 4, thereby reducing the probability of the crucible body 1 slipping, and improving the safety of the crucible in use to a certain extent.

[0040] The lower surface of the upper mold 5 is provided with a third mold cavity 13 for forming the first protrusion 2. The first mold block 11 and the second mold block 12 are fixed inside the third mold cavity 13. The diameter of the first mold block 11 corresponds to the inner diameter of the crucible body 1, and the shape of the second mold block 12 corresponds to the shape of the notch 3. The notch 3 is symmetrically provided with inclined surfaces on two opposite sides, and the other side of the notch 3 is inclined. The notch 3 is trumpet-shaped in a top view. When the crucible is in use, the hot melt metal liquid in the crucible body 1 is tilted through the notch 3 to reduce the spillage of the metal liquid.

[0041] The middle mold 6 includes a left mold 601 and a right mold 602 arranged in a semicircular shape. One side of the left mold 601 is detachably connected to one side of the right mold 602. The left mold 601 and the right mold 602 form a complete circular ring. A plurality of protrusions are fixed on one side of the left mold 601, and a socket for inserting one end of the protrusion is opened on one side of the right mold 602 to facilitate the connection between the left mold 601 and the right mold 602. A metal sheet is embedded on one side of the left mold 601, and a magnet sheet is embedded on one side of the right mold 602. The metal sheet and the magnet sheet are magnetically adsorbed, so that the left mold 601 and the right mold 602 are detachable, which is convenient for removing the crucible body 1 from the middle mold 6 during demolding.

[0042] The guide mechanism includes a plurality of positioning posts 9. An annular protrusion 8 is integrally formed on the outer wall of the upper end of the lower mold 7, and the upper surface of the protrusion 8 is flush with the upper surface of the crucible body 1. The plurality of positioning posts 9 are fixed at equal angles around the upper surface of the protrusion 8. Positioning holes for one end of the positioning posts 9 to pass through are provided on the upper mold 5 and the middle mold 6. The cooperation between the positioning posts 9 and the positioning holes facilitates the alignment and closing of the middle mold 6 and the upper mold 5 with the lower mold 7, thereby improving the alignment accuracy of the mold closing.

[0043] Based on the above-described crucible with high thermal stability, the present invention further provides a process for preparing a crucible with high thermal stability, comprising the following steps:

[0044] The steps include:

[0045] S1. Prepare the following raw materials by mass: 30 parts of aluminum oxide, 60 parts of silicon dioxide, 5 parts of iron oxide, 20 parts of ball clay, 30 parts of cooked coke, and 2 parts of kyanite powder;

[0046] S2. Dry-mix the raw materials in S1 using a blender, and after mixing evenly, add water for wet mixing to obtain a muddy raw material;

[0047] S3. Take the mud material and evenly apply it to the inside of the lower mold 7, so that the mud material covers the side walls of the second mold cavity 14 of the lower mold 7. Then, install the middle mold 6 on the upper end of the lower mold 7, and continue to apply the mud material until the side walls of the second mold cavity 14 and the side walls of the first mold cavity 10 are covered with the mud material.

[0048] S4. The upper mold 5 is driven by the lifting mechanism to combine with the middle mold 6 and the lower mold 7 for molding. At this time, the first molding block 11 passes through the middle mold 6 and is located inside the second mold cavity 14. The second molding block 12 is located in the second mold cavity 14. The excess muddy raw material is molded into the third mold cavity 13 to obtain a primary blank.

[0049] S5. Drying and dehydrating the embryo together with the mold to remove moisture from the embryo to obtain a hard embryo body;

[0050] S6, demolding the hard embryo from the mold, and transferring the demolded hard embryo to a firing kiln for firing and forming to obtain a blank; when demolding the hard embryo, first separate the upper mold 5 from the middle mold 6 and the lower mold 7, then remove the middle mold 6 and the hard embryo from the lower mold 7 together, and finally separate the hard embryo from the middle mold 6. The demolded hard embryo needs to be trimmed to remove protrusions and burrs before firing;

[0051] When the hard embryo is fired, the hard embryo is transferred to a firing kiln for firing. During the firing process, the temperature of the firing kiln is increased to 35°C every 8 hours for 180 hours. The starting temperature of the firing kiln is 40°C. After the firing is completed, the firing kiln stops heating and keeps warm for 3 hours. After the insulation is completed, the blank is taken out.

[0052] S7. Coating a protective layer on the surface and inside of the blank and naturally drying to obtain a finished crucible. The protective layer is configured as an anti-oxidation coating, and the thickness of the protective layer is 0.1-0.2 mm.

[0053] Example 2

[0054] The similarities are not repeated here. The difference from Example 1 is that, in S1, the following raw materials are prepared by mass: 35 parts of aluminum oxide, 65 parts of silicon dioxide, 6 parts of iron oxide, 25 parts of ball clay, 35 parts of cooked coke, and 2.5 parts of kyanite fine powder.

[0055] Example 3

[0056] The similarities are not repeated here. The difference from Example 1 is that, in S1, the following raw materials are prepared by mass: 48 parts of aluminum oxide, 70 parts of silicon dioxide, 7 parts of iron oxide, 30 parts of ball clay, 40 parts of cooked coke, and 3 parts of kyanite powder.

[0057] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A crucible with high thermal stability, comprising a crucible body (1), characterized in that: The outer wall of the crucible body (1) is integrally formed with a first protrusion (2) and a second protrusion (4), the upper surface of the first protrusion (2) is flush with the upper surface of the crucible body (1), the second protrusion (4) is located below the first protrusion (2), and a plurality of arc-shaped protrusions are integrally formed on the opposite side of the first protrusion (2) and the second protrusion (4), and a notch (3) is provided on the upper surface of the crucible body (1), one end of the notch (3) extends to the first protrusion. (2), the inner wall of the crucible body (1) is coated with a protective layer, the crucible body (1) is mainly made of aluminum oxide, silicon dioxide, iron oxide, ball clay, coke and blue stone fine powder as raw materials through a mold, the mold comprises an upper mold (5), a middle mold (6) and a lower mold (7), the middle mold (6) is located between the upper mold (5) and the lower mold (7), and a guide mechanism is provided between the middle mold (6) and the upper mold (5) and the lower mold (7); The lower surface of the upper mold (5) is provided with a third mold cavity (13) for forming the first protrusion (2), and a first mold block (11) and a second mold block (12) are fixed inside the third mold cavity (13), the diameter of the first mold block (11) corresponds to the inner diameter of the crucible body (1), and the outer shape of the second mold block (12) corresponds to the outer shape of the notch (3); The middle mold (6) comprises a left mold (601) and a right mold (602) arranged in a semicircular shape, one side of the left mold (601) is detachably connected to one side of the right mold (602), and the left mold (601) and the right mold (602) form a complete circular ring; The guide mechanism includes a plurality of positioning posts (9), an annular protrusion (8) is integrally formed on the outer wall of the upper end of the lower mold (7), and the upper surface of the protrusion (8) is flush with the upper surface of the crucible body (1), and the plurality of positioning posts (9) are fixed at equal angles around the upper surface of the protrusion (8), and positioning holes for one end of the positioning post (9) to pass through are provided on the upper mold (5) and the middle mold (6).

2. The crucible with high thermal stability according to claim 1, characterized in that: The lower mold (7) is provided with a second mold cavity (14) for forming the crucible body (1) and the second protrusion (4), and the upper and lower sides of the middle mold (6) are respectively provided with first mold cavities (10) for forming the convex points on the first protrusion (2) and the second protrusion (4), and the interior of the first mold cavity (10) is provided with grooves corresponding to the plurality of convex points.

3. A process for preparing a crucible with high thermal stability according to any one of claims 1 to 2, characterized in that: The steps include: S1. Prepare the following raw materials by mass: 30-48 parts of aluminum oxide, 60-70 parts of silicon dioxide, 5-7 parts of ferric oxide, 20-30 parts of ball clay, 30-40 parts of cooked coke, and 2-3 parts of kyanite powder; S2. Dry-mix the raw materials in S1 using a blender, and after mixing evenly, add water for wet mixing to obtain a muddy raw material; S3. Evenly apply the mud material to the interior of the lower mold until the mud material covers the side walls of the second mold cavity of the lower mold. Then, install the middle mold on the upper end of the lower mold and continue applying the mud material until the side walls of the second mold cavity and the side walls of the first mold cavity are covered with the mud material. S4. The upper mold is driven by a lifting mechanism to combine with the middle mold and the lower mold for molding. At this time, the first molding block passes through the middle mold and is located inside the second mold cavity. The second molding block is located in the second mold cavity. The excess muddy raw material is molded into the third mold cavity to obtain a primary embryo. S5. Drying and dehydrating the embryo together with the mold to remove moisture from the embryo to obtain a hard embryo body; S6, demolding the hard embryo from the mold, and transferring the demolded hard embryo to a firing kiln for firing and forming to obtain a blank; S7. Coat the surface and interior of the blank with a protective layer, and dry naturally to obtain a finished crucible.

4. The process for preparing a crucible with high thermal stability according to claim 3, wherein: In step S1, the following raw materials are prepared by weight: 30 parts of aluminum oxide, 60 parts of silicon dioxide, 5 parts of iron oxide, 20 parts of ball clay, 30 parts of cooked coke, and 2 parts of kyanite fine powder.

5. The process for preparing a crucible with high thermal stability according to claim 3, wherein: When the hard embryo is demolded in step S6, the upper mold (5) is first separated from the middle mold (6) and the lower mold (7), and then the middle mold (6) and the hard embryo are taken out from the lower mold (7) together. Finally, the hard embryo is separated from the middle mold (6), and the hard embryo after demolding needs to be trimmed and the protrusions and burrs are scraped off before firing.

6. The process for preparing a crucible with high thermal stability according to claim 5, characterized in that: When the hard embryo is fired, the hard embryo is transferred to a firing kiln for firing. During the firing process, the temperature of the firing kiln is increased to 35°C every 8 hours for 180 hours. The starting temperature of the firing kiln is 40°C. After the firing is completed, the firing kiln stops heating and keeps warm for 3 hours. After the insulation is completed, the blank is taken out.

7. The process for preparing a crucible with high thermal stability according to claim 6, wherein: In step S7, the protective layer is set as an anti-oxidation coating, and the thickness of the protective layer coating is 0.1-0.2 mm.

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