Fabrication and evaluation of a pulse laser-induced Ca-P coating on a Ti alloy for bioapplication.
In the present paper, we demonstrate the feasibility of depositing a tailored calcium phosphate (Ca-P) coating on a Ti-6Al-4V substrate by using a pulsed Nd:YAG laser system. Different textures were obtained by varying the laser spot overlap with change in laser traverse speed. Surface roughness measurements using laser confocal microscopy indicated a decrease in roughness with increasing laser scan speed. X-ray diffraction studies revealed the formation of alpha-TCP, TiO2, Ti and Al as the major phases. An instrumented nanoindenation technique used to study the mechanical properties of the coatings, revealed a very high hardness and Young's modulus of the coating surface as compared to the substrate. This further proved the retainment of the ceramic phase on the surface. Wear studies in a simulated biofluid (SBF) environment demonstrated an increased wear resistance of the coated samples as compared to the bare Ti-6Al-4V. Formation of an apatite-like layer after immersion in SBF for different time periods further demonstrated the bioactivity of the coated samples.
Paital
Sameer R
SR
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA.
Balani
Kantesh
K
Agarwal
Arvind
A
Dahotre
Narendra B
NB
D000497:Alloys; D001826:Body Fluids / Q000737:chemistry*; D018786:Bone Substitutes / Q000737:chemistry* / Q000528:radiation effects; D002130:Calcium Phosphates / Q000737:chemistry* / Q000528:radiation effects; D020099:Coated Materials, Biocompatible / Q000737:chemistry* / Q000528:radiation effects; D003460:Crystallization / Q000379:methods*; D053844:Lasers, Solid-State; D008422:Materials Testing; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects
D000497:Alloys; D018786:Bone Substitutes; D002130:Calcium Phosphates; D020099:Coated Materials, Biocompatible; C031462:titanium alloy (TiAl6V4); C020243:calcium phosphate; D014025:Titanium