Melting of Al2O3 powder using the skull melting method (Skull melting법에 의한 Al2O3 파우더 용융)

Hyun-Min Choi (최현민); Young-Chool Kim (김영출); SEOK, JEONG-WON (석정원)

doi:10.6111/JKCGCT.2019.29.1.024

Melting of Al2O3 powder using the skull melting method

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2019, 29(1), pp.24-31
DOI : 10.6111/JKCGCT.2019.29.1.024
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering
Received : January 7, 2019
Accepted : February 8, 2019
Published : February 28, 2019

Hyun-Min Choi ¹, Young-Chool Kim ¹, SEOK, JEONG-WON ²

¹한미보석감정원
²동신대학교

Accredited

ABSTRACT

The current study demonstrates an efficient procedure to create ingots from Al2O3 powder using the skull melting method to use these ingots as a starting material in conventional methods for growing synthetic single-crystal sapphire. Dimension of the cold crucible was 24 cm in inner diameter and 30 cm in inner height, 15 kg of Al2O3 powder was completely melted within 1 h at an oscillation frequency of 2.75 MHz, maintained in the molten state for 3 h, and finally air-cooled. The areal density and components of the cooled ingot by parts were analyzed through scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS). The areal density and Al2O3 content of the ingot were related to the temperature distribution inside the cold crucible during high-frequency induction heating, and the area with high temperature was high tends to be high in areal density and purity.

KEYWORDS

Skull melting method, Al2O3 powder, Cold crucible, Synthetic single-crystal sapphire

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* References for papers published after 2023 are currently being built.

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Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19

Melting of Al2O3 powder using the skull melting method

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* References for papers published after 2023 are currently being built.

Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19

Melting of Al2O3 powder using the skull melting method

ABSTRACT

KEYWORDS

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* References for papers published after 2023 are currently being built.