CFD Simulation Of Debinding In Metal Binder Jetting: Addressing Multi-Physics Challenges For Improved Manufacturing Efficiency

Authors:

Zhenghua Yan (Simtec Soft Sweden AB, Sweden)
Yan Liu (Simtec Soft Sweden AB, Sweden)

Abstract:

Metal Binder Jetting is a versatile 3D printing technology requiring post-processing to enhance green parts’ mechanical properties, with debinding being a critical yet complex stage. This study employs Computational Fluid Dynamics (CFD) simulations to address debinding challenges, focusing on chemical reactions, gas flow, and heat transfer within porous samples.A robust model simulates debinding using polyvinyl alcohol as the organic binder. The reaction produces CO2, H2O, and C2H6O, accounting for transient temperature variations, moisture content, and heat transfer through conduction, convection, and radiation. Results demonstrate how debinding progresses from the outer layer to the core, influencing bulk density and binder removal. Detailed distributions of gas species, velocity, and pressure provide valuable insights into optimizing debinding cycles, preventing defects, and understanding atmospheric conditions.This comprehensive CFD approach demonstrates its capability to handle coupled multi-physics processes, paving the way for enhanced efficiency and product quality in MBJ post-processing for complex porous structures.

DOI:

https://doi.org/10.59499/EP256717663