Articles
  • Effects of additives and granule powder on liquid phase sintering behavior and properties of black alumina

  • Byung-Kon Leea, Min-Kwon Parkb, Sin-Il Goc and Sang-Jin Leeb,d,*

  • aJeonnam Technopark, Suncheon 58034, Republic of Korea
    bDepartment of Advanced Materials Science and Engineering, Mokpo National University, Muan 58554, Republic of Korea
    cResearch Institute of Ceramic Processing, HK Tech Ltd. Co., Mokpo 68618, Republic of Korea
    dResearch Institute of Ceramic Industry and Technology, Mokpo National University, Muan 58554, Republic of Korea

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Electrostatic charge control and reflectance reduction are essential in semiconductor and display lithography processes. White alumina, an electrical insulator, often causes charge accumulation and light scattering, which can destabilize these processes. To overcome these drawbacks, black alumina ceramics with high density and low reflectivity are required. In this study, domestic alumina powder was mixed with additives mainly composed of Co₂O₃ and TiO₂, and the effects of additive content and sintering temperature on densification, hardness, reflectivity, and color were investigated. In particular, the role of spray granulation was examined by comparing compacts prepared with and without granulation, revealing its importance in achieving homogeneous packing and improved sintering behavior. The low melting point of Co₂O₃ facilitated liquid-phase sintering at relatively low temperatures, and nearly full densification was achieved around 1350 °C. Stable black coloration was also obtained over a wide additive range (5-35 wt%). These results demonstrate that black alumina ceramics with controlled optical and mechanical properties can be fabricated at relatively low temperatures through appropriate additive selection and granulation processing.


Keywords: Black alumina, Granule powder, Liquid phase sintering, Sintering density, Hardness, Reflectivity.

This Article

  • 2025; 26(6): 1048-1054

    Published on Dec 31, 2025

  • 10.36410/jcpr.2025.26.6.1048
  • Received on Sep 13, 2025
  • Revised on Nov 24, 2025
  • Accepted on Nov 24, 2025

Correspondence to

  • Sang-Jin Lee

  • bDepartment of Advanced Materials Science and Engineering, Mokpo National University, Muan 58554, Republic of Korea
    dResearch Institute of Ceramic Industry and Technology, Mokpo National University, Muan 58554, Republic of Korea
    Tel : +82-61-450-2493 Fax: +82-61-450-2498

  • E-mail: lee@mokpo.ac.kr