Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Mechanical Properties and Reliability of Sand Casting 3D Printing Materials

사형 주조 3D 프린팅용 소재의 기계적 특성 및 신뢰성

  • Son, Hyeon Jin (3D Printing Materials Center, Korea Institute of Materials Science (KIMS)) ;
  • Jang, Seongwan (3D Printing Materials Center, Korea Institute of Materials Science (KIMS)) ;
  • Lee, Hwan Jong (Korea Automotive Technology Institute) ;
  • Yang, Jeong Jik (Korea Automotive Technology Institute) ;
  • Jeong, Yeong Geun (Department of fusion, Pusan National University) ;
  • Bae, Chang-Jun (3D Printing Materials Center, Korea Institute of Materials Science (KIMS))
  • 손현진 (재료연구소 3D프린팅소재연구센터) ;
  • 장성완 (재료연구소 3D프린팅소재연구센터) ;
  • 이환종 (자동차 부품 연구원) ;
  • 양정직 (자동차 부품 연구원) ;
  • 정영근 (부산대학교 융합학부 하이브리드소재응용) ;
  • 배창준 (재료연구소 3D프린팅소재연구센터)
  • Received : 2019.10.28
  • Accepted : 2019.12.20
  • Published : 2020.01.27
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Abstract

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/㎠. 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/㎠, 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.

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References

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