Bioinspired nacre-like alumina with a metallic nickel compliant phase fabricated by spark-plasma sintering
File(s)smll.201900573_R1.pdf (2.87 MB)
Accepted version
Author(s)
Type
Journal Article
Abstract
Many natural materials present an ideal "recipe" for the development of future damage-tolerant lightweight structural materials. One notable example is the brick-and-mortar structure of nacre, found in mollusk shells, which produces high-toughness, bioinspired ceramics using polymeric mortars as a compliant phase. Theoretical modeling has predicted that use of metallic mortars could lead to even higher damage-tolerance in these materials, although it is difficult to melt-infiltrate metals into ceramic scaffolds as they cannot readily wet ceramics. To avoid this problem, an alternative ("bottom-up") approach to synthesize "nacre-like" ceramics containing a small fraction of nickel mortar is developed. These materials are fabricated using nickel-coated alumina platelets that are aligned using slip-casting and rapidly sintered using spark-plasma sintering. Dewetting of the nickel mortar during sintering is prevented by using NiO-coated as well as Ni-coated platelets. As a result, a "nacre-like" alumina ceramic displaying a resistance-curve toughness up to ≈16 MPa m½ with a flexural strength of ≈300 MPa is produced.
Date Issued
2019-08-02
Date Acceptance
2019-05-01
Citation
Small, 2019, 15 (31)
ISSN
1613-6810
Publisher
Wiley
Journal / Book Title
Small
Volume
15
Issue
31
Copyright Statement
© 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted version of the following article: Wat, A., Ferraro, C., Deng, X., Sweet, A., Tomsia, A. P., Saiz, E., Ritchie, R. O., Bioinspired Nacre‐Like Alumina with a Metallic Nickel Compliant Phase Fabricated by Spark‐Plasma Sintering. Small 2019, 1900573. https://doi.org/10.1002/smll.201900573, which has been published in final form at https://doi.org/10.1002/smll.201900573
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/31131997
Subjects
bioinspired ceramics
ceramic-metal composites
compliant-phase ceramics
flexural strength
fracture toughness
nacre
spark plasma sintering
Publication Status
Published
Coverage Spatial
Germany
Article Number
1900573
Date Publish Online
2019-05-27