Research Progress on Interface Mechanisms and Performance Regulation of Modified Binders in Metal Injection Molding

In the context of metal injection molding, binders assume a role of paramount importance, exerting a direct influence on the quality of the injection and the efficiency of the degreasing process. The selection of an appropriate binder is therefore paramount, ensuring that the feedstock exhibits optimal rheological properties and effective debeinding performance. This is essential for the homogeneity of the billet and the densification of the sintered product. However, conventional binders exhibit inherent deficiencies in flowability and defect formation, and modification of binders to improve their performance has become an urgent need in injection moulding. The objective of this paper is to systematically review the progress of various binder modification strategies and investigate their mechanisms of action, focusing on the optimization of binder formulations, the improvement of the interfacial interaction between binder and metal powder, and the enhancement of the stability of the degreasing process.