Indexed by: Journal paper

Journal: Ceramics International

Included Journals: SCI

Discipline: Engineering

Document Type: J

Key Words: Binder jetting additive manufacturing；Al2O3–CuO–TiO2/316L FGMs；Relative density；Microstructure；Crack deflection；Toughening mechanism

Date of Publication: 2023-07-06

Impact Factor: 5.2

Abstract: Al2O3-based ceramic functionally graded materials (FGMs) containing 1 wt.% CuO and 4 wt.% TiO2 as sintering aids and 0–40 wt.% 316L as a toughening phase are fabricated by binder jetting additive manufacturing, and the low-temperature co-sintering toughening mechanism was studied. According to the 3D Stereo Microscope and XRD results, the interfacial microstructure exhibited a noticeable gradient change after being sintered from 1200 °C to 1450 °C for 2 h, and the main phases were Al2O3, γ-austenitie, Fe3C and a small amount of δ-ferrite. The FGMs sintered at 1450 °C had maximum relative density, X–Z-axis dimensional shrinkage and average bending strength values of 70.05%, 4.89%, 10.15%, 17.53% and 26.9 ± 0.87 MPa, respectively. Bending cracks originated from the pure Al2O3-based ceramic layer and gradually propagated to the high-316L side, accompanied by the crack bridging and deflection phenomena. The maximum crack deflection degree was about 90° at 1200 °C and 1400 °C. Obviously, the existence of crack bridging and deflection illustrated that 316L addition effectively improves the toughness of FGMs.

Links to published journals: https://doi.org/10.1016/j.ceramint.2023.06.039