Particle size reduction is an important step in many technological operations. The process itself is defined as the mechanical breakdown of solids into smaller particles to increase the surface area and induce defects in solids, which are needed for subsequent operations such as chemical reactions. To fabricate nano-sized particles, several tens to hundreds of micron size ceramic beads, formed through high energy milling process, are required. To minimize the contamination effects during highenergy milling, the mechanical properties of zirconia beads are very important. Generally, the mechanical properties of Y2O3 stabilized tetragonal zirconia beads are closely related to the mechanism of phase change from tetragonal to monoclinic phase via external mechanical forces. Therefore, Y2O3 distribution in the sintered zirconia beads must also be closely related with the mechanical properties of the beads. In this work, commercially available 100μm-size beads are analyzed from the point of view of microstructure, composition homogeneity (especially for Y2O3), mechanical properties, and attrition rate.

Abstract
 1. 서 론
 2. 실험 방법
 3. 결과 및 고찰
 4. 결 론
 References

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• 김세중(한국기계연구원 부설 재료연구소 기능세라믹연구실, 과학기술연합대학원 대학교 신소재공학 전공) | Sae-Jung Yoon (Functional Ceramics Department, Korea Institute of Materials Science, Advanced Materials Engineering, University of Science and Technology (UST))
• 한병동(한국기계연구원 부설 재료연구소 기능세라믹연구실, 과학기술연합대학원 대학교 신소재공학 전공) | Byung-Dong Hahn (Functional Ceramics Department, Korea Institute of Materials Science, Advanced Materials Engineering, University of Science and Technology (UST))
• 안철우(한국기계연구원 부설 재료연구소 기능세라믹연구실) | Cheol-Woo Ahn (Functional Ceramics Department, Korea Institute of Materials Science)
• 윤운하(한국기계연구원 부설 재료연구소 기능세라믹연구실) | Woon-Ha Yoon (Functional Ceramics Department, Korea Institute of Materials Science)
• 최종진(한국기계연구원 부설 재료연구소 기능세라믹연구실) | Jong-Jin Choi (Functional Ceramics Department, Korea Institute of Materials Science) Corresponding author