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2025 Vol.35, Issue 9 Preview Page

Research Paper

Hardness of Ultra-High-Density Alumina Fabricated using the Aerodynamic Levitation Process

Aerodynamic Levitation 공정으로 제조한 초고밀도 알루미나 경도 특성

Ye-Ji Son12*
,
Dong-Wook Kim3*
,
Seung-Wook Kim12
,
Hyo-Min Kim12
,
Hui-Woong Kang1
,
Min-Yeong Ha1
,
Dae-Yong Jeong12†
손 예지12*
,
김 동욱3*
,
김 승욱12
,
김 효민12
,
강 희웅1
,
하 민영1
,
정 대용12†
1Department of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea
2Program in Semiconductor Convergence, Inha University, Incheon 22212, Republic of Korea
3Department of Electrical Engineering, Inha University, Incheon 22212, Republic of Korea
1인하대학교 신소재공학과
2인하대학교 반도체융합
3인하대학교 전기공학과
†Corresponding author E-Mail : dyjeong@inha.ac.kr (D.-Y. Jeong, Inha Univ.)
*These two authors are equally contributed as first authors.
27 September 2025. pp. 436-440
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Abstract

High-temperature sintering is required to obtain pure and dense alumina, but it results in excessive grain growth, which eventually deteriorates the performance of the material. Technologies have been developed to lower the sintering temperature, such as the addition of a sintering aid, but these methods may cause secondary phases and still deteriorate physical properties. In this study, pure high-density alumina sintered bodies were prepared by applying an aerodynamic levitation (ADL) process without using sintering additives. Alumina that was sintered using a furnace showed a relative sintering density of 98.3 %, while alumina produced by the ADL process showed a relative density of 99.75 %. Compared to alumina prepared with the general sintering method, ADL alumina showed about a 37 % increase in hardness. ADL alumina showed a dense microstructure, attributed to instantaneous sintering at a high temperature of 2,000 °C or higher, and crystal grain growth was suppressed by rapid cooling to room temperature, resulting in ultra-high density. The ADL method is a promising manufacturing method that can improve the mechanical properties of ceramics that need to be sintered at high temperatures, and can be used to manufacture special high-performance ceramics for application in high-temperature environments.

Keywords
alumina
aerodynamic levitation
densification
hardness
rapid cooling
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 35
  • No :9
  • Pages :436-440
  • Received Date : 2025-08-13
  • Revised Date : 2025-09-10
  • Accepted Date : 2025-09-11
  • DOI :https://doi.org/10.3740/MRSK.2025.35.9.436
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