Structure-property correlation of alumina pyramidoids fabricated by direct ink writing

Abstract

The direct ink writing (DIW) technique prints alumina Pyramidoids. Ink formulation included the usage of pure alumina powder, phenolic resin, and deionized water. Alumina ink with a solid loading of 64 vol% provides suitable rheological properties for 3D printing. The synthesized ink was used for 3D printing of a pyramidoid and sintering at different temperatures (1500 °C–1600 °C). The sample sintered at 1600 °C exhibits a dense microstructure (98 %), good flexural strength (308.34 ± 10 MPa), moderate fracture toughness (4.01 ± 0.4 MPa.m^1/2), and high hardness (1625 HV).