Mechanical Properties of Titanium Nitride Nanocomposites Produced by Chemical Precursor Synthesis Followed by High-P,T Treatment

Edward Bailey, Nicole M T Ray, Andrew L. Hector, Peter Crozier, William Petuskey, Paul F. McMillan

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

We investigated the high-P,T annealing and mechanical properties of nanocomposite materials with a highly nitrided bulk composition close to Ti3N4. Amorphous solids were precipitated from solution by ammonolysis of metal dialkylamide precursors followed by heating at 400-700 oC in flowing NH3 to produce reddish-brown amorphous/nanocrystalline materials. The precursors were then densified at 2 GPa and 200-700 oC to form monolithic ceramics. There was no evidence for N2 loss during the high-P,T treatment. Micro- and nanoindentation experiments indicate hardness values between 4-20 GPa for loads ranging between 0.005-3 N. Young's modulus values were measured to lie in the range 200-650 GPa. Palmqvist cracks determined from microindentation experiments indicate fracture toughness values between 2-4 MPa·m1/2 similar to Si3N4, SiC and Al2O3. Significant variations in the hardness may be associated with the distribution of amorphous/crystalline regions and the very fine grained nature (~3 nm grain sizes) of the crystalline component in these materials.

Original languageEnglish (US)
Pages (from-to)1747-1762
Number of pages16
JournalMaterials
Volume4
Issue number10
DOIs
StatePublished - 2011

Keywords

  • High pressure
  • Metal nitrides
  • Microhardness
  • Nanocomposite materials
  • Nanoindentation
  • Synthesis
  • TiN

ASJC Scopus subject areas

  • Materials Science(all)

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