|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Architectured Bioinspired Alumina with a Metallic Nickel Compliant-phase
||Amy Wat, Claudio Ferraro, Xu Deng, Andrew Sweet, Antoni P Tomsia, Eduardo Saiz, Robert O. Ritchie
|On-Site Speaker (Planned)
Many biological materials are composites comprising hard and soft constituents arranged into multiple-scale, hierarchical architectures that form compelling combinations of mechanical properties. One notable example is the brick-and-mortar structure of nacre, which has resulted in high-toughness ceramics using polymeric mortars as a compliant phase. Theoretical modeling has predicted that metallic mortars could lead to higher damage tolerance in these materials, although it is difficult to melt-infiltrate metals into ceramic scaffolds as they cannot readily wet ceramics. We report an approach to synthesize “nacre-like” structured ceramics containing a thin nickel mortar. These materials were fabricated using nickel-coated alumina platelets that are aligned via slip-casting and rapidly sintered using spark-plasma sintering. The dewetting of the nickel mortar during sintering was prevented using NiO-coated as well as Ni-coated platelets. As a result, we have produced a “nacre-like” alumina displaying a resistance-curve toughness up to ~16 MPa·m˝ with a flexural strength of ~300 MPa.
||Biomaterials, Ceramics, Mechanical Properties