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Seeding equipment and seeding method

A kind of equipment and seed crystal technology, which is applied in the field of crystal material preparation, can solve problems such as long seeding time, large human interference factors, and sudden changes in crystal internal quality, so as to increase crystal yield output, reduce crystal abnormality probability, and shorten seeding time. The effect of the crystal cycle

Inactive Publication Date: 2020-07-14
FUJIAN JING AN OPTOELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the seeding process is divided into pagoda-type seeding, composite seeding, and micro-pulling method. These methods have low requirements on the initial temperature of crystallization during seeding, and the length of crystallization is longer, and the seeding time is longer. The technical level of crystal personnel is too high, and the human interference factors are large, and the probability of abnormality will increase, which will easily cause crystal abnormality
Once bubbles or polycrystalline growth lines appear in the crystal, it will not only cause a sudden change in the internal quality of the crystal, but more seriously, the crystal will be directly scrapped
Therefore, this method not only causes the loss of energy, but also wastes precious time, affects the continuity of production, and greatly increases production costs.

Method used

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  • Seeding equipment and seeding method

Examples

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Embodiment 1

[0039] This embodiment discloses a seeding device, such as figure 1 As shown, it includes a seed crystal clamp 1 for holding the seed crystal in the seeding process and a crucible 2 for placing molten raw materials; a crucible cover 21 is arranged above the crucible 2, and a through hole is arranged in the center of the crucible cover 21. The hole 211 and the through hole 211 have an aperture diameter of 45-60mm. The design of the aperture diameter of the through hole narrows the range of liquid surface cooling and ensures that there is no phenomenon such as long skew or long angle during seeding. In a preferred embodiment, as Figure 3-7 As shown, the seed clamp 1 includes a clamp rod 11 and a seed clamp 12 arranged at one end of the clamp rod 11. The seed clamp 12 is provided with a seed clamp slot 14 for placing a seed and a seed clamp cover 13 The seed crystal clamp cover plate 13 is detachably mounted on the seed crystal chuck 12, for example, it can be connected through...

Embodiment 2

[0041] This embodiment discloses a seeding method, such as figure 2 As shown, including: 1) Preparatory work: put the alumina raw material into the crucible and melt to obtain the melt; 2) Seeding: Wait until the temperature of the melt reaches the temperature corresponding to the crystal growth rate of 15-30min / 2-2.5mm At the same time, the seed crystal is immersed under the liquid surface of the melt under the clamping of the seed crystal fixture, so that the liquid surface of the seed crystal and the melt is completely welded. Preferably, step 2) further includes: adjusting the rotation speed of the seed crystal to 3-5 revolutions / min, pulling the seed crystal 5-20 times, and completing seeding when the growth rate reaches 30-40 min / 2-2.5 mm. Preferably, step 2) further includes: pulling the seed crystal every 15-30 minutes, and the length of the growing crystal for each pulling is 2-2.5 mm. Preferably, the total seeding time is 8-12 hours; preferably, the total seeding l...

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Abstract

The invention discloses seeding equipment and a seeding method, and the seeding equipment comprises a seed crystal clamp for clamping a seed crystal in the seeding process and a crucible for placing amolten raw material, wherein a crucible cover plate is arranged above the crucible, a through hole is formed in the center of the crucible cover plate, and the hole diameter of the through hole is 45-60mm. The seeding method comprises the following steps: 1) preparation work: putting an aluminum oxide raw material into the crucible for melting to obtain a molten liquid; and 2) seeding: when the temperature of the molten liquid reaches the temperature corresponding to the crystal growth speed of 15-30min / 2-2.5 mm, immersing the seed crystal under the clamping of a seed crystal clamp under theliquid level of the molten liquid, so that the seed crystal is completely welded with the liquid level of the molten liquid. According to the method, the seeding quality is effectively improved, the seeding time is shortened, the production cost is greatly reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of crystal material preparation, in particular to seeding equipment and a seeding method. Background technique [0002] The Kyropoulos method is recognized as one of the mainstream methods most suitable for growing large-sized sapphire single crystals in the world. The raw material of high-purity alumina with a purity of 99.999% is placed in a crucible and heated until it melts. The surface center temperature is close to 2050°C, and the growth of sapphire crystal is completed through seeding-shoulder expansion-equal diameter growth-finishing. Seeding refers to the process of inserting the seed crystal into the melt and waiting for a certain period of time before pulling it upwards and observing the size of the crystal growth to determine the temperature, and continuously pulling it upwards until the crystal is grown. After the appropriate growth temperature, the seeding is completed. [0003] Seeding is di...

Claims

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Application Information

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IPC IPC(8): C30B17/00C30B29/20
CPCC30B17/00C30B29/20
Inventor 吴锋波余剑云王进学陈建明杨胜裕
Owner FUJIAN JING AN OPTOELECTRONICS CO LTD