The Effect of PVA Binder System on the Printability of Alumina Paste for Direct Ink Writing

The use of polymeric binders in the fabrication of ceramic parts by extrusion-based ۳D printers is considered to be one of thekey elements that, in addition to providing a suitable suspension paste for the addition of ceramic particles, directly affects thecontrollability of their flow behavior and ultimately their printability. To this end, the present research investigated the effectof simultaneously adding different polyvinyl alcohol binders with different debinding temperatures to alumina pastes. Becauseof the high viscosity of the alumina at high percentages by weight, its printability is difficult for this reason, and the devicecan be damaged during the printing process. In addition, the density and strength properties of the printed parts suffer from adecrease in printability quality. For this purpose, the effects of hybrid binder systems on the additive manufacturing of aluminacomponents were investigated, evaluating three different compositional ratios (۲۵/۷۵, ۵۰/۵۰, and ۷۵/۲۵) to identify the optimalformulation. The experimental results show that strategic selection of binder proportions significantly improves both therheological properties critical for extrusion-based printing and the structural integrity of sintered components. Accordingly, itwas observed that the sample with the highest PVA ratio with lower debinding temperature showed the best printability, butthe strength and density properties of the cured samples of the equal binder combination sample were the highest.

کلیدواژه ها:

Direct Ink Writing ، Ceramic Additive Manufacturing ، Alumina Paste Rheology ، Polyvinyl Alcohol