A well-established characterization method is required in powder bed fusion (PBF) metal additive manufacturing, where metal powder is used. The characterization methods from the traditional powder metallurgy process are still being used. However, it is necessary to develop advanced methods of property evaluation with the advances in additive manufacturing technology. In this article, the characterization methods of powders for metal PBF are reviewed, and the recent research trends are introduced. Standardization status and specifications for metal powder for the PBF process which published by the ISO, ASTM, and MPIF are also covered. The establishment of powder characterization methods are expected to contribute to the metal powder industry and the advancement of additive manufacturing technology through the creation of related databases.

Abstract
1. Introduction
2. PBF용 금속 분말 특성평가 방법
    2.1 분말 크기 및 형상
    2.2 상, 조성 및 순도 분석
    2.3 흐름성 분석
3. PBF 금속 분말 특성평가 관련 표준 및기관 동향
    3.1 ISO 및 ASTM
    3.2 MPIF
4. PBF 금속 분말 특성평가의 한계와최신 연구 동향
    4.1 Avalanche angle
    4.2 Powder Rheometer
    4.3 직접측정
5. 결 론
References

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