Process method for producing high-purity alumina polycrystal in graphite suspension cold crucible

A technology of high-purity alumina and a process method is applied in the field of producing high-purity alumina polycrystals from a graphite suspension type cold crucible, which can solve the problems of high temperature around the cold crucible, inconvenient operation, complicated structure of an automatic lifting mechanism, etc. The method is simple and easy to operate, easy to operate, and the effect of the process is rapid

Active Publication Date: 2020-01-31
睿为电子材料(天津)有限公司
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  • Abstract
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Problems solved by technology

Due to the high temperature around the cold crucible during induction heating, and the complex structure of the automatic lifting mechanism, it is not easy to operate

Method used

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  • Process method for producing high-purity alumina polycrystal in graphite suspension cold crucible

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Embodiment 1

[0037] see figure 1 A method for producing high-purity alumina polycrystals in a graphite suspension type cold crucible, comprising the steps of:

[0038] 1) Fill the cold crucible with high-purity alumina raw material powder, the total height of the high-frequency induction coil is 10cm, and the height of the lower edge of the high-frequency induction coil is at 11cm, and the added raw material powder is compacted as a base material, so that after compaction The height of the high-purity alumina raw material powder is 16cm;

[0039] 2) Put a high-purity graphite sheet with a diameter of 12cm, a thickness of 0.5cm, and a purity greater than 99.99% on the above-mentioned base material, and then evenly cover a layer of 1cm-high uncompacted high-purity alumina on the high-purity graphite sheet Raw material powder;

[0040] 3) Start the water-cooling system of the cold crucible, turn on the power supply of the high-frequency induction coil, adjust the power supply frequency of t...

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Abstract

The invention relates to a process for preparing high-purity alumina polycrystal from suspended graphite via a cold crucible. The process comprises the following steps: filling the cold crucible with high-purity alumina raw powder and compacting the high-purity alumina raw powder to allow the height of the compacted raw powder to be located between the upper edge height and the lower edge height of high-frequency induction coils; then putting graphite flakes with high purity of more than 99.99% on a spread backing material and uniformly covering the graphite flakes with a layer of uncompacted raw powder with a height of 1 cm; starting a crucible water-cooling system, turning on the power source of the induction coils and carrying out induction heating; allowing the graphite flakes to be rapidly heated to 3000 DEG C or above and rapidly melting nearby raw powder to form an alumina molten pool after complete melting of the raw powder, thereby allowing the graphite flakes to float above the molten pool and contact with air; allowing the crucible to begin to descend, continuing feeding of the raw powder into the cold crucible and allowing the graphite flakes to always float on the top of the molten pool, to continuously contact with air and to be oxidized into carbon dioxide gas until the graphite flakes eventually vanish; and finally, completing production of the high-purity alumina polycrystal.

Description

technical field [0001] The invention belongs to the technical field of preparing high-purity metal oxides by cold crucibles, and in particular relates to a process method for preparing high-purity aluminum oxide polycrystals by graphite suspension cold crucibles. Background technique [0002] It is an effective method to produce high-purity and high-density alumina by electromagnetic induction heating in a cold crucible. The cold crucible is surrounded by dozens of water-cooled copper tubes. The induction coil outside the cold crucible generates an induced electromagnetic field, and the induced electromagnetic field is transparent. Through the gap between the copper tubes, it acts on the raw materials in the cold crucible. If the raw material is a conductor, an induced current can be induced to inductively heat the raw material. [0003] For most metal oxides (such as alumina, magnesia, silicon dioxide), their solid state is non-conductor and cannot be directly heated by in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B28/06C30B29/20
CPCC30B28/06C30B29/20
Inventor 张清勇唐皇哉胡树金
Owner 睿为电子材料(天津)有限公司
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