Widiantara I Putu, Putri Rosy Amalia Kurnia, Han Da In, Bahanan Warda, Lee Eun Hye, Woo Chang Hoon, Kang Jee-Hyun, Ryu Jungho, Ko Young Gun
School of Materials Science & Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
Kyerim Metal Co., Ltd., Chilgok 39910, Republic of Korea.
Materials (Basel). 2023 Mar 22;16(6):2516. doi: 10.3390/ma16062516.
Metal injection molding (MIM) is a quick manufacturing method that produces elaborate and complex items accurately and repeatably. The success of MIM is highly impacted by green part characteristics. This work characterized the green part of steel produced using MIM from feedstock with a powder/binder ratio of 93:7. Several parameters were used, such as dual gates position, injection temperature of ~150 °C, and injection pressure of ~180 MPa. Analysis using Moldflow revealed that the aformentioned parameters were expected to produce a green part with decent value of confidence to fill. However, particular regions exhibited high pressure drop and low-quality prediction, which may lead to the formation of defects. Scanning electron microscopy, as well as three-dimensional examination using X-ray computed tomography, revealed that only small amounts of pores were formed, and critical defects such as crack, surface wrinkle, and binder separation were absent. Hardness analysis revealed that the green part exhibited decent homogeneity. Therefore, the observed results could be useful to establish guidelines for MIM of steel in order to obtain a high quality green part.
金属注射成型（MIM）是一种快速制造方法，能够精确且可重复地生产精致复杂的产品。MIM的成功高度受生坯零件特性的影响。这项工作对采用粉末/粘结剂比例为93:7的原料通过MIM生产的钢质生坯零件进行了表征。使用了几个参数，如双浇口位置、约150°C的注射温度和约180MPa的注射压力。使用Moldflow进行的分析表明，上述参数预计会生产出具有合理填充置信度值的生坯零件。然而，特定区域表现出高压降和低质量预测，这可能导致缺陷的形成。扫描电子显微镜以及使用X射线计算机断层扫描的三维检查表明，仅形成了少量孔隙，并且不存在诸如裂纹、表面皱纹和粘结剂分离等关键缺陷。硬度分析表明，生坯零件表现出良好的均匀性。因此，观察到的结果可能有助于建立钢质MIM的指导方针，以获得高质量的生坯零件。
