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Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 32 , No. 3

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Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 32, No. 3, pp. 135-142
Abbreviation: J. Korean Soc. Manuf. Technol. Eng.
ISSN: 2508-5107 (Online)
Print publication date 15 Jun 2023
Received 24 Apr 2023 Revised 16 May 2023 Accepted 23 May 2023
DOI: https://doi.org/10.7735/ksmte.2023.32.3.135
마이크로 분말사출성형용 마이크로/나노분말 피드스톡의 혼합 및 열분해 특성분석
최준필^a ; 하태호^a ; 정민교^a ; 송여울^a ; 이필호^a^{, *}

Characterization of Powder Loading for Micro/Nano Powder Feedstock for Micro Powder Injection Molding
Joon Phil Choi^a ; Taeho Ha^a ; Min-Kyo Jung^a ; Yeo-Ul Song^a ; Pil-Ho Lee^a^{, *}
aDepartment of 3D Printing, Korea Institute of Machinery & Materials
Correspondence to : ^*Tel.: +82-42-868-7786 E-mail address: pilho_lee@kimm.re.kr (Pil-Ho Lee).



Funding Information ▼ Ministry of Science and ICT Korea Institute of Machinery and Materials NK242J National Research Foundation of Korea 2021M3D1A2047721

Abstract

This study evaluates the characterization of powder loading for 316L stainless steel (STS 316L) micro/nano powder feedstock through torque rheometry and thermal analysis. The feedstock was prepared using a bimodal powder mixture consisting of 75 vol.% micro powder (D50, 4.1 μm) and 25 vol.% nano powder (D50, 100 nm) with a wax-based binder system. The torque variation was measured to determine the critical powder loading during the feedstock mixing. Furthermore, thermogravimetric analysis (TGA) was conducted to evaluate the decomposition behavior of the feedstock at varying powder loadings. The results indicate that a powder loading of 66 vol.% exhibits an optimal microstructure and low sensitivity to the debinding temperature, considering a suitable powder loading for micro powder injection molding (μ-PIM) of STS 316L. These findings provide significant insights for optimizing the powder loading of STS 316L feedstock for μ-PIM applications.


Keywords: Micro powder injection molding (μ-PIM), Micro/nano powder feecstodk, Optimal powder loading, Thermal decomposition

Acknowledgments

본 논문은 정부(과학기술정보통신부)의 재원으로 한국기계연구원 기관 기본사업 (NK242J) 및 한국연구재단 나노 및 소재기술개발사업 (2021M3D1A2047721)의 지원을 받아 수행한 연구의 결과입니다.

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Joon Phil Choi

Senior Researcher in Korea Institute of Machinery & Materials. His research interest is Material and Process Development for Net-shape Technologies.

E-mail: jpchoi@kimm.re.kr

Taeho Ha

Principal Researcher in Korea Institute of Machinery & Materials. His research interest is Additive Manufacturing Process and Equipment Development.

E-mail: taehoha@kimm.re.kr

Min-Kyo Jung

Senior Researcher in Korea Institute of Machinery & Materials. His research interest is Design for Additive Manufacturing by using FEM.

E-mail: mkjung@kimm.re.kr

Yeo-Ul Song

Senior Researcher in Korea Institute of Machinery & Materials. Her research interests are Computer-aided Engineering and Structural Optimization.

E-mail: yeoulsong@kimm.re.kr

Pil-Ho Lee

Senior Researcher in Korea Institute of Machinery & Materials. His research interest is Process and System Development of Additive Manufacturing System.

E-mail: pilho_lee@kimm.re.kr