Seed-crystal-free crystal crucible
By designing the structure of the seed-free crystal crucible, including capillary segments and necked segments, the problem of high processing cost of seed crystals in the prior art is solved, and efficient and low-cost single crystal growth and excellent optical performance are achieved.
Patent Information
- Application Number
- CN202420922145.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-29
AI Technical Summary
In the existing single crystal growth methods, seed crystal processing costs are high and technically difficult, resulting in high cost and low yield.
A seed-free crystal crucible is designed, including capillary segments, first shoulder-release segments, neck-release segments, first equal-diameter segments, secondary shoulder-release segments and equal-diameter growth segments. Through structural optimization, seed-free crystal growth is achieved at the bottom of the crucible. , reduce the internal defect density of crystals.
It achieves efficient single crystal growth without the need to place seed crystals, reducing costs, and improving crystal quality and optical performance.
Smart Images
Figure CN222182532U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of crucible devices, in particular to a seed-free crystal crucible. Background Art
[0002] The descending method of growing single crystals is a common crystal growth method. Its basic principle is to create a certain temperature gradient in the upper and lower heating zones by controlling the temperature of the upper and lower heating zones. The raw materials are loaded into a crucible and placed in a descending furnace for heating and melting. Then the crucible is driven by a descending device to slowly descend through the temperature gradient zone, thereby crystallizing at the bottom of the crucible. As the crucible continues to move, the crystal gradually grows in the opposite direction of the crucible's movement.
[0003] The key to this method is the crystallization process at the bottom of the crucible in the early stage of crystal growth. In order to ensure the quality of the initial crystallization, seed crystals are generally placed at the bottom of the crucible to induce crystallization, thereby improving the quality of crystal growth. However, the cost of seed crystal processing is high, the seed crystal placement technology is difficult, the process is complicated, and the seed crystal growth has strict requirements on the temperature control of the equipment, resulting in high cost and low yield of seed crystal induced growth.
[0004] Therefore, a seed-free crystal crucible is provided to solve the above-mentioned problems. Utility Model Content
[0005] The utility model aims to solve the problems raised in the above-mentioned background technology and proposes a seed-free crystal crucible.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A seed-free crystal crucible, comprising a crucible body:
[0008] The crucible body comprises, from bottom to top, a capillary section, a primary shoulder section, a necking section, a primary equal-diameter section, a secondary shoulder section, and an equal-diameter growth section;
[0009] The capillary section has an inner wall diameter of 0.1-1 mm;
[0010] In the initial shoulder section, the inner wall diameter is enlarged from 1mm to 2.5mm from bottom to top;
[0011] In the necking section, the inner wall diameter decreases from 2.5 mm to 1 mm from bottom to top;
[0012] The first equal diameter section has an inner wall diameter of 1 mm and a length of 5-10 mm;
[0013] In the secondary shoulder section, the inner wall diameter is enlarged from 1mm to 10-100mm from bottom to top;
[0014] In the equal diameter growth section, the inner wall diameter is controlled at 10-100mm.
[0015] For ease of use, preferably, the total length of the crucible body is 100-800 mm.
[0016] In order to facilitate holding, preferably, a screw rod is further included, a sliding block is fixedly connected to the crucible body, and the sliding block is threadedly connected to the screw rod.
[0017] In order to facilitate the up and down movement of the crucible, preferably, it further comprises: a shell, the screw rod is rotatably connected to the shell, and the shell is provided with an opening, and the sliding block is slidably connected in the opening.
[0018] In order to facilitate the rotation of the screw rod, preferably, a rotating column is fixedly connected to the screw rod.
[0019] Compared with the prior art, the utility model provides a seed-free crystal crucible, which has the following beneficial effects:
[0020] The utility model provides a seed-free crystal growth crucible. There is no need to place a seed crystal, and a neck reduction and a secondary shoulder section are arranged at the bottom of the crucible. The internal defect density of the crystal is reduced by structural optimization, so that seed-free growth can be achieved. In this way, the crystal growth efficiency is higher and the cost is lower, the crystal quality is greatly improved, and the optical quality is better. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 The structure of a seed-free crystal crucible proposed by the utility model is schematically shown. Figure 1 ;
[0022] Figure 2 The structure of a seed-free crystal crucible proposed by the utility model is schematically shown. Figure 2 ;
[0023] Figure 3 This is a structural schematic diagram of a crucible body in a seed-free crystal crucible proposed by the utility model;
[0024] Figure 4 A seed-free crystal crucible proposed by the utility model Figure 3 Schematic diagram of the structure of part A.
[0025] In the figure: 1. crucible body; 101. capillary section; 102. primary shoulder section; 103. necking section; 104. primary equal diameter section; 105. secondary shoulder section; 106. equal diameter growth section; 201. shell; 202. screw; 203. rotating column; 3. sliding block. DETAILED DESCRIPTION
[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0027] Embodiment 1:
[0028] Reference Figure 1-4 A seed-free crystal crucible comprises a crucible body 1: the crucible body 1 comprises, from bottom to top, a capillary section 101, a primary shoulder section 102, a necking section 103, a primary equal diameter section 104, a secondary shoulder section 105, and an equal diameter growth section 106; the capillary section 101 has an inner wall diameter of 0.1-1 mm; the primary shoulder section 102 has an inner wall diameter enlarged from 1 mm to 2.5 mm from bottom to top; the necking section 103 has an inner wall diameter enlarged from 2.5 mm to 1 mm from bottom to top mm is reduced to 1mm; the first equal diameter section 104 has an inner wall diameter of 1mm and a length of 5-10mm; the secondary shoulder section 105 has an inner wall diameter enlarged from 1mm to 10-100mm from bottom to top; the equal diameter growth section 106 has an inner wall diameter controlled at 10-100mm, the crucible material is quartz, graphite or platinum with a purity of> 99.99%, the thickness of the crucible is 0.5-3mm, and the total length of the crucible is 100-800mm.
[0029] The crucible is divided into 6 sections from bottom to top, the first section is a capillary section 101, the inner wall diameter is between 0.1-1mm, the second section is a primary shoulder section 102, the inner wall diameter is enlarged from 1mm to 2.5mm from bottom to top, the third section is a necking section 103, the inner wall diameter is reduced from 2.5mm to 1mm from bottom to top, the fourth section is a primary equal diameter section 104, the inner wall diameter is 1mm, and the length is 5-10mm, the fifth section is a secondary shoulder section 105, the inner wall diameter is enlarged from 1mm to 10-100mm from bottom to top, and the sixth section is an equal diameter growth section 106. According to actual needs, the inner wall diameter can be controlled within 10-100mm. Compared with the traditional crucible, the crucible has an additional necking section and a secondary shoulder section 105, which can realize seed-free growth, and the internal defect density of the grown crystal is greatly reduced, and the optical quality is better;
[0030] At the bottom of the crucible, seedless crystal growth is achieved through the capillary section 101, the nucleation quality inside the crystal is optimized through the primary shoulder section 102 and the necking section 103, and stable crystal growth is achieved through the secondary shoulder section 105 and the equal-diameter growth section 106.
[0031] Using this crucible to grow crystals avoids the tedious and complicated seed crystal preparation, processing and placement operations. At the same time, the internal defect density of the crystal is greatly reduced through the necking and shouldering process. The grown crystals are complete and transparent, and the photoelectric performance is greatly improved.
[0032] The following are two specific experimental data.
[0033] Data 1: A Φ25mm×200mm single crystal is grown, using a platinum crucible with a wall thickness of 1mm and a total length of 400mm. Among them, the inner wall gap of the capillary section 101 is 1.5mm, and the inner wall gap is the inner wall diameter. The inner wall gap of the first shoulder section 102 is enlarged from 1.5mm to 2.5mm from bottom to top, and the inner wall gap of the necking section 103 is reduced from 2.5mm to 1mm from bottom to top. The inner wall gap of the first equal diameter section 104 is 1mm and the length is 8mm. The inner wall gap of the secondary shoulder section 105 is enlarged from 1mm to 25mm from bottom to top. The inner wall gap of the equal diameter growth section 106 is 25mm and the length is 350mm.
[0034] Data 2: A Φ50mm×100mm single crystal is grown, using a quartz crucible with a wall thickness of 2mm and a total length of 200mm. Among them, the inner wall gap of the capillary section 101 is 1mm, the inner wall gap of the first shoulder section 102 is enlarged from 1mm to 2mm from bottom to top, the inner wall gap of the necking section 103 is reduced from 2mm to 1mm from bottom to top, the inner wall gap of the first equal diameter section 104 is 1mm and the length is 5mm, the inner wall gap of the second shoulder section 105 is enlarged from 1mm to 50mm from bottom to top, and the inner wall gap of the equal diameter growth section 106 is 50mm and the length is 150mm
[0035] Embodiment 2:
[0036] Reference Figure 1-4 , a seed-free crystal crucible, which is basically the same as Example 1, and further includes: a screw rod 202, a sliding block 3 is fixedly connected to the crucible body 1, and the sliding block 3 is threadedly connected to the screw rod 202, and also includes: a shell 201, the screw rod 202 is rotatably connected to the shell 201, and the shell 201 is provided with an opening, the sliding block 3 is slidably connected in the opening, and a rotating column 203 is fixedly connected to the screw rod 202.
[0037] When heating is performed, the device can be placed in a descending furnace to form a suitable temperature gradient, the raw materials can be loaded into a crucible, and the crucible can be placed in the descending furnace for heating and melting. Then, the crucible can slowly descend through the temperature gradient zone while rotating the screw 202, so that crystals are formed at the bottom of the crucible. As the crucible continues to move, the crystals gradually grow in the opposite direction to the movement of the crucible. After completion, the device can be taken out.
[0038] The utility model provides a seed-free crystal growth crucible, which does not require placement of seed crystals. A neck reduction and a secondary shoulder section 105 are provided at the bottom of the crucible. The density of internal defects of the crystal is reduced by structural optimization, so that seed-free growth can be achieved. In this way, crystal growth efficiency is higher, cost is lower, crystal quality is greatly improved, and optical quality is better.
[0039] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A seed-free crystal crucible, characterized in that: The crucible comprises a crucible body (1): The crucible body (1) comprises, from bottom to top, a capillary section (101), a primary shoulder section (102), a necking section (103), a primary equal-diameter section (104), a secondary shoulder section (105), and an equal-diameter growth section (106); The capillary segment (101) has an inner wall diameter of 0.1-1 mm; In the first shoulder section (102), the inner wall diameter is enlarged from 1 mm to 2.5 mm from bottom to top; The inner wall diameter of the necking section (103) is reduced from 2.5 mm to 1 mm from bottom to top; The first equal diameter section (104) has an inner wall diameter of 1 mm and a length of 5-10 mm; The secondary shoulder section (105) has an inner wall diameter that increases from 1 mm to 10-100 mm from bottom to top; The inner wall diameter of the equal diameter growth section (106) is controlled to be 10-100 mm.
2. A seed-free crystal crucible according to claim 1, characterized in that: The total length of the crucible body (1) is 100-800 mm.
3. The seed-free crystal crucible according to claim 1, characterized in that: It also comprises a screw rod (202), a sliding block (3) is fixedly connected to the crucible body (1), and the sliding block (3) is threadedly connected to the screw rod (202).
4. The seed-free crystal crucible according to claim 3, characterized in that: Also includes: The housing (201) is provided with a screw rod (202) which is rotatably connected to the housing (201). The housing (201) is provided with an opening, and the sliding block (3) is slidably connected in the opening.
5. The seed-free crystal crucible according to claim 3, characterized in that: A rotating column (203) is fixedly connected to the screw rod (202).