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

Mechanical properties of titanium nitride nanocomposites produced by chemical precursor synthesis followed by high-P,T treatment
Mechanical properties of titanium nitride nanocomposites produced by chemical precursor synthesis followed by high-P,T treatment
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.
metal nitrides, Ti3N4, synthesis, high pressure, microhardness, nanoindentation, nanocomposite materials
1747-1762
Bailey, Edward
f8d37c59-781a-489b-8758-273d05dc0129
Thompson, Nicole M.
51585e5d-6c6f-42fd-b252-70b3ab78a57e
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Crozier, Peter
14fc2933-6044-42f6-a918-038d5795a607
Petuskey, William T.
7c464fcd-8e13-44f0-a3ee-6eb4689cc186
McMillan, Paul F.
8bca9219-06e0-4621-bdae-ad059709a147
Bailey, Edward
f8d37c59-781a-489b-8758-273d05dc0129
Thompson, Nicole M.
51585e5d-6c6f-42fd-b252-70b3ab78a57e
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Crozier, Peter
14fc2933-6044-42f6-a918-038d5795a607
Petuskey, William T.
7c464fcd-8e13-44f0-a3ee-6eb4689cc186
McMillan, Paul F.
8bca9219-06e0-4621-bdae-ad059709a147

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).

Record type: Article

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.

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More information

Published date: 6 October 2011
Keywords: metal nitrides, Ti3N4, synthesis, high pressure, microhardness, nanoindentation, nanocomposite materials
Organisations: Electrochemistry

Identifiers

Local EPrints ID: 198955
URI: https://eprints.soton.ac.uk/id/eprint/198955
PURE UUID: 25a26195-581c-4b59-ba4a-ee3483a9f483
ORCID for Andrew L. Hector: ORCID iD orcid.org/0000-0002-9964-2163

Catalogue record

Date deposited: 10 Oct 2011 13:31
Last modified: 20 Jul 2019 01:16

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