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Title: Indentation and scratch testing of DLC-Zr coatings on ultrafine-grained titanium processed by high-pressure torsion
Authors: Wang, Chuan Ting 
Escudeiro, Ana 
Polcar, Tomas 
Cavaleiro, Albano 
Wood, Robert J. K. 
Gao, Nong 
Langdon, Terence G. 
Keywords: High-pressure torsion; Titanium; DLC-Zr coatings; Adhesion; Bio-implants
Issue Date: 30-Aug-2013
Publisher: Elsevier
Citation: WANG, Chuan Ting [et al.] - Indentation and scratch testing of DLC-Zr coatings on ultrafine-grained titanium processed by high-pressure torsion. "Wear". ISSN 0043-1648. Vol. 306 Nº. 1-2 (2013) p. 304-310
Serial title, monograph or event: Wear
Volume: 306
Issue: 1-2
Abstract: High-pressure torsion was employed to refine the microstructure of grade 2 Ti under an imposed pressure of 3.0 GPa at room temperature. The microhardness of grade 2 Ti increased from 1.82 GPa for the coarse grain state to 3.05 GPa after high-pressure torsion processing, where this value is very close to the hardness of the Ti–6Al–4V alloy. Subsequently, several diamond-like carbon (DLC) coatings with thicknesses of ∼1.4 μm were deposited on as-received Ti, high-pressure torsion processed Ti and Ti–6Al–4V samples via physical vapour deposition. Both indentation and scratch tests showed a much improved adhesion of DLC-7Zr, DLC:H-7Zr and DLC-9Zr coatings with high-pressure torsion processed Ti as the substrate by comparison with the same coatings on coarse-grained Ti. The results suggest that commercial pure Ti processed by high-pressure torsion and coated with a diamond-like carbon coating provides a potential candidate material for bio-implant applications.
ISSN: 0043-1648
DOI: 10.1016/j.wear.2012.12.033
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais
FCTUC Eng.Mecânica - Artigos em Revistas Internacionais

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