Mechanical properties of Al2O3 and Al2O3/Al with Gyroid structure obtained by stereolithographic additive manufacturing and melt infiltration

To obtain both plasticity and toughness of the material at the same time, various manufacturing techniques of ceramic-metal composites and structures have been studied. In this work, a bio-inspired Al2O3 ceramic scaffold with Gyroid structure was designed and prepared by stereolithographic (SL) additive manufacturing, then the Al2O3/Al ceramic-metal hybrid structure was prepared by infiltrating molten Al into the Al2O3 ceramic structure. The performances of the Al2O3 ceramic scaffold and the Al2O3/Al ceramic-metal hybrid structure were compared and analyzed by a quasi-static compression experiment. The quasi-static compressive strength of the pristine Al2O3 scaffold was 14.36 MPa, while that of the Al2O3/Al ceramic-metal hybrid structure was up to 89.06 MPa. Moreover, the plasticity of the Al2O3/Al ceramic-metal hybrid structure was much higher than that of the Al2O3 scaffold. During compression, the Al2O3/Al ceramic-metal hybrid structure had excellent energy absorption, reaching up to 2569.16 KJ/m³, 15 times that of the Al2O3 scaffold. Therefore, this method can obtain materials with excellent ductility and toughness.