The effects of graphene nano-platelet additions on the sliding wear of TiC-Ni^sub 3^Al cermets

TiC-Ni3Al cermets are potential replacement materials for WC-based hardmetals in several applications. Potential improvements to selected mechanical and tribological properties of these cermets are investigated, through addition of graphene nano-platelets (GNPs) to a baseline TiC-30 vol.% Ni3Al cerm...

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Bibliographic Details
Published in:Tribology international 2019-02, Vol.130, p.119
Main Authors: Gaier, M, Farhat, ZN, Plucknett, KP
Format: Article
Language:English
Subjects:
Aluminum
Blood platelets
Cemented carbides
Ceramics
Cermets
Coefficient of friction
Diamond pyramid hardness
Effects
Fracture toughness
Frictional wear
Graphene
Indentation
Intermetallic compounds
Nanoparticles
Nickel aluminides
Platelets (materials)
Sliding friction
Tribology
Wear rate
Wear resistance
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Summary:TiC-Ni3Al cermets are potential replacement materials for WC-based hardmetals in several applications. Potential improvements to selected mechanical and tribological properties of these cermets are investigated, through addition of graphene nano-platelets (GNPs) to a baseline TiC-30 vol.% Ni3Al cermet system. GNP contents up to 2.5 vol.% were assessed, replacing Ni3Al in the overall composition, with samples vacuum sintered at 1550 °C for 2 h. GNP additions up to 2.5 vol.% increase the Vickers hardness (from ∼1060 to ∼1220 HV1) and indentation fracture resistance (from ∼14.2 to ∼16.7 MPa m0.5). GNP additions significantly lower the coefficient of friction, from ∼0.53 to ∼0.15, and the specific wear rate, from ∼15.5 to ∼1.7 × 10−6 mm3/Nm, when assessed with a pin-on-ring wear test geometry.
ISSN:0301-679X
1879-2464