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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.30 No.1 pp.38-43

Mechanical Properties and Reliability of Sand Casting 3D Printing Materials

Hyeon Jin Son1,2, Seongwan Jang1, Hwan Jong Lee3, Jeong Jik Yang3, Yeong Geun Jeong2, Chang-Jun Bae1†
13D Printing Materials Center, Korea Institute of Materials Science (KIMS), Changwon 51508, Republic of Korea
2Department of fusion, Pusan National University, Busan 46241, Republic of Korea
3Korea Automotive Technology Institute, Gyeonggi 15041, Republic of Korea
Corresponding author E-Mail : (C.-J. Bae, KIMS)


Sand casting 3D printing uses a binder jetting method to produce a mold having complicated shape by spraying a binder on sand coated with activator. Appropriate heat treatment process in sand mold fabrication can increase the degree of polymerization to improve flexural strength. However, long heat treatment of over 24 hours decreases flexural strength and reliability due to chemical bond decomposition through thermal degradation. The main role of the activator is to control the reaction rate between the polymer chains. As a result, when the activator composition is increased from 0.15 wt% to 0.25 wt%, the flexural strength is increased by 218 N/cm2. However, excess activator (0.40 wt%) has been shown to decrease reliability without increasing flexural strength. The main role of the binder is to control the flexural strength of the specimen. As the binder composition is increased from 2.00 wt% to 4.00 wt%, the flexural strength increases to about 255 N/cm2, indicating the maximum flexural strength increase. Finally, the reliability of the flexural strength of the fabricated specimens is evaluated by a Weibull plot. Weibull modulus calculations are used to evaluate the flexural strength reliability of the specimens, and maximum reliability value of 11.7 is obtained at 0.20 wt% activator composition. Therefore, it is confirmed that this composition has maximum flexural strength reliability.

사형 주조 3D 프린팅용 소재의 기계적 특성 및 신뢰성

손현진1,2, 장성완1, 이환종3, 양정직3, 정영근2, 배창준1†
1재료연구소 3D프린팅소재연구센터, 2부산대학교 융합학부 하이브리드소재응용, 3자동차 부품 연구원