The Effect of PVA Binder System on the Printability of Alumina Paste for Direct Ink Writing
Subject Areas : Journal of Environmental Friendly Materials
Sh Mahboubizadeh
1
,
A Kazemi
2
,
M Khodaei
3
1 -
2 -
3 -
Keywords: Direct Ink Writing, Ceramic Additive Manufacturing, Alumina Paste Rheology, Polyvinyl Alcohol,
Abstract :
The use of polymeric binders in the fabrication of ceramic parts by extrusion-based 3D printers is considered to be one of the key elements that, in addition to providing a suitable suspension paste for the addition of ceramic particles, directly affects the controllability of their flow behavior and ultimately their printability. To this end, the present research investigated the effect of simultaneously adding different polyvinyl alcohol binders with different debinding temperatures to alumina pastes. Because of the high viscosity of the alumina at high percentages by weight, its printability is difficult for this reason, and the device can be damaged during the printing process. In addition, the density and strength properties of the printed parts suffer from a decrease in printability quality. For this purpose, the effects of hybrid binder systems on the additive manufacturing of alumina components were investigated, evaluating three different compositional ratios (25/75, 50/50, and 75/25) to identify the optimal formulation. The experimental results show that strategic selection of binder proportions significantly improves both the rheological properties critical for extrusion-based printing and the structural integrity of sintered components. Accordingly, it was observed that the sample with the highest PVA ratio with lower debinding temperature showed the best printability, but the strength and density properties of the cured samples of the equal binder combination sample were the highest
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