Influence of Temperature and Time on the Friction of Additively Manufactured Green Parts During Sintering

Abstract In sinter-based processes such as metal binder jetting, components undergo shrinkage, potentially leading to undesirable deformation depending on geometry and setup. A key influencing factor is the friction between the setter plate and the component. Previous studies have shown how the condition of the setter plate affects the friction coefficient for 17-4 PH material. However, the impact of ambient temperature on both static and dynamic friction remains underexplored, despite its importance in understanding friction-based part distortion and improving sintering process simulations. This article examines the influence of ambient temperature on friction coefficients and analyzes the effect of holding time between test series to minimize deviations caused by the motion sequence in the experimental setup. The findings show that elevated temperatures and extended holding times result in higher friction coefficients. While surface roughness does not appear to have a significant influence, one cause may be the reduction in rolling friction due to sintering neck formation between powder particles. However, further investigations into the mechanical properties of the base material and its oxides at elevated temperatures are necessary to determine the exact cause of the observed increase.