A Novel Design Approach for Self-Crack-Healing Structural Ceramics with 3D Networks of Healing Activator.

ABSTRACT: Self-crack-healing by oxidation of a pre-incorporated healing agent is an essential property of high-temperature structural ceramics for components with stringent safety requirements, such as turbine blades in aircraft engines. Here, we report a new approach for a self-healing design containing a 3D network of a healing activator, based on insight gained by clarifying the healing mechanism. We demonstrate that addition of a small amount of an activator, typically doped MnO localised on the fracture path, selected by appropriate thermodynamic calculation significantly accelerates healing by >6,000 times and significantly lowers the required reaction temperature. The activator on the fracture path exhibits rapid fracture-gap filling by generation of mobile supercooled melts, thus enabling ef

SUBMITTER: Osada T 

PROVIDER: S-EPMC5736619 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature