Mechanical properties of titanium nitride nanocomposites produced by chemical precursor synthesis followed by high-P,T treatment


Bailey, Edward, Thompson, Nicole M., Hector, Andrew L., Crozier, Peter, Petuskey, William T. and McMillan, Paul F. (2011) Mechanical properties of titanium nitride nanocomposites produced by chemical precursor synthesis followed by high-P,T treatment. Materials, 4, (10), 1747-1762. (doi:10.3390/ma4101747).

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Description/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.

Item Type: Article
ISSNs: 1996-1944 (electronic)
Keywords: metal nitrides, Ti3N4, synthesis, high pressure, microhardness, nanoindentation, nanocomposite materials
Subjects: T Technology > TN Mining engineering. Metallurgy
T Technology > TP Chemical technology
Divisions: Faculty of Natural and Environmental Sciences > Chemistry > Electrochemistry
ePrint ID: 198955
Date Deposited: 10 Oct 2011 13:31
Last Modified: 27 Mar 2014 19:46
URI: http://eprints.soton.ac.uk/id/eprint/198955

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