A novel biomimetic approach to the design of high-performance ceramic-metal composites

J R Soc Interface. 2010 May 6;7(46):741-53. doi: 10.1098/rsif.2009.0331. Epub 2009 Oct 14.

Abstract

The prospect of extending natural biological design to develop new synthetic ceramic-metal composite materials is examined. Using ice-templating of ceramic suspensions and subsequent metal infiltration, we demonstrate that the concept of ordered hierarchical design can be applied to create fine-scale laminated ceramic-metal (bulk) composites that are inexpensive, lightweight and display exceptional damage-tolerance properties. Specifically, Al(2)O(3)/Al-Si laminates with ceramic contents up to approximately 40 vol% and with lamellae thicknesses down to 10 microm were processed and characterized. These structures achieve an excellent fracture toughness of 40 MPa radicalm at a tensile strength of approximately 300 MPa. Salient toughening mechanisms are described together with further toughening strategies.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Aluminum Oxide / chemistry
  • Biomimetics*
  • Ceramics / chemistry*
  • Freezing
  • Hardness
  • Materials Testing
  • Metals / chemistry*
  • Microscopy, Electron, Scanning / methods
  • Microscopy, Electron, Transmission / methods
  • Models, Statistical
  • Pressure
  • Silicon / chemistry
  • Stress, Mechanical
  • Surface Properties
  • Tensile Strength

Substances

  • Metals
  • Aluminum Oxide
  • Silicon