Quartz crucible with low bubble expansion rate and preparation method thereof

By using coarse and fine quartz sand combined with a high-vacuum melting process in the preparation of quartz crucibles, the problem of removing surface bubbles from quartz crucibles was solved, resulting in quartz crucibles with low bubble expansion rates, which improved the quality and yield of monocrystalline silicon.

CN122277079APending Publication Date: 2026-06-26ADVANCED QUARTZ MATERIAL (HANGZHOU) CO LTD
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Patent Information

Application Number
CN202610577214.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-28
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing methods for preparing quartz crucibles cannot effectively remove bubbles from the crucible surface. This causes the bubbles to expand and burst at high temperatures, releasing impurities that contaminate the silicon melt and affect the quality and yield of monocrystalline silicon.

Method used

Coarse-grained quartz sand is used to form the bubble layer in the crucible, while fine-grained quartz sand forms the transparent layer. Combined with high-vacuum melting technology and different melting power stages, the bubbles are gradually removed through centrifugal molding and vacuum pump extraction to form a dense and uniform structure.

Benefits of technology

It significantly reduces surface bubbles in the quartz crucible, lowers the bubble expansion rate, improves the quality and yield of monocrystalline silicon, and provides a fundamental guarantee for the growth of ultra-high quality, ultra-low defect density monocrystalline silicon.

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Abstract

The invention provides a preparation method of a quartz crucible with a low bubble expansion rate, and belongs to the technical field of quartz crucible production, and the preparation method comprises the following steps: S1, pouring quartz sand into a mold, and molding the quartz sand by adopting centrifugal molding to form a crucible bubble layer and a crucible transparent layer of the quartz crucible, the transparent layer of the crucible is made of fine-particle quartz sand; s2, the formed quartz sand and the mold are fed into a melting chamber, and a vacuum pump is started to exhaust air to preset pressure; s3, arcing is conducted on the mold, and in the crucible transparent layer forming stage, first-section high-temperature melting is conducted on the quartz sand with first preset power; and S4, in the later stage of melting, performing second-stage high-temperature melting on the quartz sand at second preset power, and taking out the mold after the second-stage high-temperature melting is finished to obtain the quartz crucible with the low bubble expansion rate. According to the invention, the quartz crucible with low bubbles and low bubble expansion rate is finally prepared by matching the granularity of the quartz sand and combining with a melting power adjusting mode.
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