HYDROXYAPATITE/Si-DOPED TiN INTERLAYER COATINGS AS POTENTIAL CANDIDATES FOR SURFACE MODIFICATION OFÂ MEDICAL-GRADE 316 LVM STAINLESS STEEL FOR BIOIMPLANT APPLICATIONS

Syed Mahammad Shafi, Lokeswar Patnaik, Saikat Ranjan Maity, Sunil Kumar (), Kuldeep K. Saxena, Chander Prakash and Dharam Buddhi
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Syed Mahammad Shafi: Department of Mechanical Engineering, National Institute of Technology Silchar, Cachar 788010, Assam, India†Department of Mechanical Engineering, Indian Institute of Technology Tirupati, Tirupati 517619, Andhra Pradesh, India
Lokeswar Patnaik: ��School of Mechanical Engineering, Sathyabama Institute of Science and Technology, (Deemed to be University), Chennai 600119, Tamil Nadu, India
Saikat Ranjan Maity: Department of Mechanical Engineering, National Institute of Technology Silchar, Cachar 788010, Assam, India
Sunil Kumar: �Department of Mechanical Engineering, School of Engineering, Amrita Vishwa Vidyapeetham, Chennai Campus, Tiruvallur 601103, Tamil Nadu, India
Kuldeep K. Saxena: �School of Mechanical Engineering, Lovely Professional University, Phagwara 144411, Punjab, India
Chander Prakash: �School of Mechanical Engineering, Lovely Professional University, Phagwara 144411, Punjab, India
Dharam Buddhi: ��Division of Research & Innovation, Uttaranchal University, Dehradun 248007, Uttarakhand, India

Surface Review and Letters (SRL), 2025, vol. 32, issue 05, 1-13

Abstract: Hydroxyapatite (HAp) was deposited by plasma spraying technique with TiSiN adhesive interlayer on the medical-grade 316 LVM stainless steel. The surface topographies of HAp and HAp/TiSiN were evaluated using X-ray diffraction (XRD), Raman spectroscopy, atomic force microscopy (AFM), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The important mechanical properties of the films such as hardness (H) and elastic modulus (E) were determined by the nanoindentation test. Lastly, the adhesion and anti-scratch behaviors of the films were evaluated by Rockwell-C indentation and nanoscratch test, respectively. The elemental analysis showed the values of Ca/P (at.%/at.%) ratio to be 1.80 and 1.59 in HAp and HAp/TiSiN coatings, respectively. The mechanical properties of HAp film with TiSiN interlayer were greatly improved from 1.23 ± 0.26GPa to 10.6 ± 1.12GPa for hardness and from 18 ± 3GPa and 29.8 ± 5GPa for elastic modulus, respectively. The results of the Rockwell-C indentation test showed a significant reduction in HAp coating delamination with TiSiN interlayer which can be categorized with HF2 or HF3 Daimler–Benz quality ranking. What is more, the nanoscratch profile of HAp coating showed wider scratch with evidence of deformation at the edges which got significantly reduced with the TiSiN interlayer. The results are suggestive of improved mechanical properties, viz. hardness and elastic modulus, and improved adhesion strength of HAp coating with TiSiN interlayer.

Keywords: Hydroxyapatite; silicon doping; coatings; plasma spray; nanoindentation; nanoscratch (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1142/S0218625X23400048

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