Caracterização de massa para impressão 3D à base de alumina e amido gelificado

Abstract

The control of process parameters is essential to obtain materials with a functional porosity gradient, which present several opportunities. Applications in the medical, nuclear, and aerospace areas are in the repertoire of ceramics with porosity gradient, which can be obtained from the use of additive manufacturing. In this work, alumina doped with magnesium oxide was used and the effects of corn starch to increase the viscosity of the ceramic mass were studied, as well as its use as a sacrifice phase. To achieve the objective of proving the possibility of obtaining pieces with a porosity gradient, from the deposition, by extrusion, of different compositions, measurements of printing efforts, plasticity and apparent viscosity were made. The specimens were characterized for apparent porosity and linear shrinkage, estimates for Poisson’s coefficient and determination of elastic and shear modulus obtained by dynamic test of excitation by impulse. As a result, three compositions with similar rheological behavior were defined, suitable for application in the additive manufacturing process. Apparent porosity was different in each of the sintered products, the characterization of the mechanical behavior of the samples showed significantly different values between the samples.