Wear Behavior of Plasma Spray Deposited and Post
Heat-Treated Hydroxyapatite (HA)-Based Composite
Coating on Titanium Alloy (Ti-6Al-4V) Substrate
RENU KUMARI and JYOTSNA DUTTA MAJUMDAR
The present study concerns a detailed evaluation of wear resistance property of plasma spray
deposited composite hydroxyapatite (HA)-based (HA-50 wt pct TiO
and HA-10 wt pct ZrO
bioactive coatings developed on Ti-6Al-4V substrate and studying the eﬀect of heat treatment
on it. Heat treatment of plasma spray deposited samples has been carried out at 650 °C for
2 hours (for HA-50 wt pct TiO
coating) and at 750 °C for 2 hours (for HA-10 wt pct ZrO
coating). There is signiﬁcant deterioration in wear resistance for HA-50 wt pctTiO
a marginal deterioration in wear resistance for HA-10 wt pct ZrO
coating in as-sprayed state
(as compared to as-received Ti-6Al-4V) which is, however, improved after heat treatment. The
coeﬃcient of friction is marginally increased for both HA-50 wt pct TiO
and HA-10 wt pct
coatings in as-sprayed condition as compared to Ti-6Al-4V substrate. However, coeﬃcient
of friction is decreased for both HA-50 wt pct TiO
and HA-10 wt pct ZrO
heat-treated condition as compared to Ti-6Al-4V substrate. The maximum improvement in
wear resistance property is, however, observed for HA-10 wt pct ZrO
sample after heat
treatment. The mechanism of wear has been investigated.
Ó The Minerals, Metals & Materials Society and ASM International 2018
osteoconductive and bioactive material and is widely
used as coating on orthopedic implant material.
limitation of this coating is its poor wear resistance and
fracture toughness properties.
Fu et al.
fretting wear behavior of thermal-sprayed hydroxyap-
atite (HA) coating and found a coeﬃcient of friction of
0.7 to 0.8 for HA against stainless steel (AISI 410) and
concluded that the wear mechanism was delamination
and abrasive in nature. In another study of Fu et al.,
bovine albumin provides eﬀective lubrication during
fretting wear of HA coating against stainless steel
surface and the mechanisms of wear were mainly
delamination, pitting, and abrasive wear. Furthermore,
hot isostatic pressing (HIP) post treatment densiﬁed the
coating structure, decreased the generation of fretting
wear debris, and improved the fretting wear resistance.
Kalin et al.
studied the eﬀect of counterface roughness
on abrasive wear of hydroxyapatite. They found that the
wear volume of hydroxyapatite increased as the surface
roughness of the glass-inﬁltrated alumina and the load
was increased. Xei et al.
studied the interface of HA/
-graded composite in a dog lumbar vertebra bone
defect model and observed high bone bonding rate
(BBR) of HA/ZrO
-graded composite coating. Far-
noush et al.
applied functionally graded HA/TiO
Ti-6Al-4V by electrophoretic deposition method and
reported improved corrosion resistance, adhesion
strength, and fracture toughness. Single layer, double
layer, and functionally graded coatings of HA/TiO
were deposited on Ti-6Al-4V titanium alloy substrate by
electrophoretic deposition technique (EPD) which
showed an improved adhesion strength (~ 31 MPa) in
functionally graded coating as compared to HA single
layer and HA/TiO
double layer coatings.
coating on Ti-6Al-4V using
hydrothermal-electrochemical method and reported that
both the phase composition and the morphology of the
coatings were signiﬁcantly inﬂuenced by the variation in
the anodizing voltage. Wang et al.
nano-mechanical properties and bio-tribological behav-
iors of nanosized HA/partially stabilized zirconia (PSZ)
composites. They reported that HA-30 pct PSZ com-
posite showed the highest hardness, lowest friction
coeﬃcient and wear rate. Balani et al.
improvement in fracture toughness and wear resistance
RENU KUMARI is with the Department of Metallurgical and
Materials Engineering, I. I. T. Kharagpur, Kharagpur, West Bengal,
721302, India and also with the Department of Metallurgical and
Materials Engineering, NIFFT, Ranchi, Jharkhand, India. JYOTSNA
DUTTA MAJUMDAR is with the Department of Metallurgical and
Materials Engineering, I. I. T. Kharagpur. Contact e-mail: jyotsna@
Manuscript submitted July 7, 2017.
Article published online April 25, 2018
3122—VOLUME 49A, JULY 2018 METALLURGICAL AND MATERIALS TRANSACTIONS A