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Materials 2011, 4(10), 1747-1762; doi:10.3390/ma4101747

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

1
Christopher Ingold Laboratory, Department of Chemistry and Materials Chemistry Centre, University College London, 20 Gordon St., London WC1H 0AJ, UK
2
School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA
3
School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK
4
Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287, USA
*
Author to whom correspondence should be addressed.
Received: 12 September 2011 / Revised: 27 September 2011 / Accepted: 28 September 2011 / Published: 6 October 2011
(This article belongs to the Special Issue Hard Materials: Advances in Synthesis and Understanding)
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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 °C in flowing NH3 to produce reddish-brown amorphous/nanocrystalline materials. The precursors were then densified at 2 GPa and 200–700 °C 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. View Full-Text
Keywords: metal nitrides; Ti3N4; synthesis; high pressure; microhardness; nanoindentation; nanocomposite materials metal nitrides; Ti3N4; synthesis; high pressure; microhardness; nanoindentation; nanocomposite materials
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MDPI and ACS Style

Bailey, E.; Ray, N.M.T.; Hector, A.L.; Crozier, P.; Petuskey, W.T.; McMillan, P.F. Mechanical Properties of Titanium Nitride Nanocomposites Produced by Chemical Precursor Synthesis Followed by High-P,T Treatment. Materials 2011, 4, 1747-1762.

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