Tensile strength of aqueous-based alumina tapes using a PVP–PVA–gelatin cobinder

A cobinder, consisting of polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) and gelatin, was used to prepare aqueous-based alumina tapes for three-dimensional forming. The tensile strength, humidity dependent strength degradation, and drying rate of the tapes were investigated by varying the amounts of PVA and gelatin. Gelatin was beneficial for increasing the tape strength and the drying rate, and the addition of PVA alleviated the humidity sensitive strength degradation. The overall performance of the alumina tape was optimized with the use of a cobinder containing 89.5 wt.% PVP, 10 wt.% PVA, and 0.5 wt.% gelatin.