Hydrogenated diamond-like carbon (DLC) (H-DLC), argon-incorporated DLC (Ar-DLC) and nitrogen-incorporated DLC (N-DLC) coatings were deposited on flat rectangular Ti-6Al-4V samples. The DLC coatings were characterised by Raman spectroscopy and nanoindentation. Fretting wear tests were conducted on uncoated and DLC coated samples with an alumina ball as the counterbody. As the Ar-DLC and N-DLC coatings had relatively more sp2 network compared to the H-DLC coating, they exhibited lower values of hardness and elastic modulus. At both loads of 4.9 N and 14.7 N, all DLC coated specimens showed lower values of tangential force coefficient (TFC), wear volume and specific wear rate compared to the uncoated samples. While the Ar-DLC coated sample exhibited the lowest TFC, wear volume and specific wear rate at 4.9 N load, the N-DLC coated specimen exhibited the lowest TFC, wear volume and specific wear rate at 14.7 N load. © 2009 Elsevier B.V. All rights reserved.

S. Ganesh Sundara Raman

Department of Metallurgical and Materials Engineering

Rajappa Gnanamoorthy

Department of Mechanical Engineering

P. Navaneethakrishnan

ALUMINA BALLS

COATED SAMPLES

DIAMOND-LIKE CARBON

DLC COATINGS

FRETTING WEAR

FRETTING WEAR TESTS

HARDNESS AND ELASTIC MODULUS

HYDROGENATED DIAMONDS

PLASMA ENHANCED CHEMICAL VAPOUR DEPOSITION

Relative performance

TANGENTIAL FORCE COEFFICIENTS

Ti-6Al-4V

Wear rates

WEAR VOLUMES

Aluminum

Argon

Coatings

Diamonds

FRETTING CORROSION

Hydrogenation

Lithium compounds

Plasma deposition

Plasma enhanced chemical vapor deposition

Plasmas

Raman scattering

Raman spectroscopy

Spectrum Analysis

titanium

tribology

Titanium alloys

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Thin Solid Films

The influence of detonation gun sprayed alumina coating on Al-Mg-Si alloy (AA 6063) test samples subjected to cyclic loading with and without fretting was studied in the present work. Coated samples were grounded to have coatings of two different thickness values, 40 and 100 μm. Both 40- and 100-μm-thick coated specimens experienced almost the same but slightly higher friction force compared with uncoated samples. Under plain fatigue loading, 100 μm coated specimens exhibited inferior lives due to the presence of lower surface compressive residual stress compared with uncoated and 40-μm-thick coated samples. Under fretting fatigue loading, uncoated specimens exhibited inferior lives compared with coated samples owing to the very low hardness of the uncoated specimens (80 against 1020 HV0.2). The reason for the superior fretting fatigue lives of 40-μm-thick coated samples compared with 100-μm-thick coated samples was the presence of relatively higher surface compressive residual stress in 40-μm-thick coated specimens. © 2007 Elsevier Ltd. All rights reserved.

Tribology International

Influence of detonation gun sprayed alumina coating on AA 6063 samples under cyclic loading with and without fretting

Rolling element bearings experience fretting wear type of failures due to small relative oscillatory motion existing between races and rolling elements of the bearing. Small oscillatory motion between contacting surfaces that occur due to overall machine or system vibration and unexpected loads in service causes accumulation of wear debris in the contact zone and accelerate the wear process. A fretting wear test rig is designed and developed in the laboratory for understanding the fretting wear behavior of bearing materials. The test rig is designed for testing at slip amplitudes ranging from 20 to 200 μm and test frequencies ranging from 1 to 30 Hz. Preliminary studies for understanding the fretting wear characteristics were conducted on hardened and tempered bearing steel, En31 and widely employed hardened and tempered structural steel, En24 at various normal loads. Coefficient of friction during fretting tests was high during the initial stages of fretting tests and reached a steady state. The coefficient of friction depends on the normal load. Wear scar morphology reveals the nature of contact exhibited by the fretting contacts. © 2004 Elsevier Ltd. All rights reserved.

Materials and Design

Development of a fretting wear test rig and preliminary studies for understanding the fretting wear properties of steels

Diamond and Related Materials

Deposition of diamond-like carbon films on aluminium substrates by RF-PECVD technique: Influence of process parameters

Tribological properties of DLC films deposited under various conditions using a plasma-enhanced CVD

An overview on the tribological behavior of diamond-like carbon in technical and medical applications

Relative performance of hydrogenated, argon-incorporated and nitrogen-incorporated diamond-like carbon coated Ti-6Al-4V samples under fretting wear loading

Journal	Thin Solid Films
ISSN	00406090
Open Access	No