Deposition of titanium nitride and hydroxyapatite-based biocompatible composite by reactive plasma spraying

• Published in: Applied surface science Vol. 258; no. 8; pp. 3871 - 3876
• Main Authors: Roşu, Radu Alexandru, Şerban, Viorel-Aurel, Bucur, Alexandra Ioana, Dragoş, Uţu
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.02.2012; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Hydroxyapatite; Physics; Reactive plasma spraying; Titanium nitride; Titanium nitride; Reactive plasma spraying; Hydroxyapatite; Plasma arc spraying; Composite materials
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2011.12.049

► Titanium nitride and hydroxyapatite based composite layers obtained by reactive plasma spraying. ► Deposition of the composites onto a titanium substrate at different spraying distances. ► Characterization of the coatings roughness as function of the spraying distances. Titanium nitride is a bioceramic material successfully used for covering medical implants due to the high hardness meaning good wear resistance. Hydroxyapatite is a bioactive ceramic that contributes to the restoration of bone tissue, which together with titanium nitride may contribute to obtaining a superior composite in terms of mechanical and bone tissue interaction matters. The paper presents the experimental results in obtaining composite layers of titanium nitride and hydroxyapatite by reactive plasma spraying in ambient atmosphere. X-ray diffraction analysis shows that in both cases of powders mixtures used (10% HA+90% Ti; 25% HA+75% Ti), hydroxyapatite decomposition occurred; in variant 1 the decomposition is higher compared with the second variant. Microstructure of the deposited layers was investigated using scanning electron microscope, the surfaces presenting a lamellar morphology without defects such as cracks or microcracks. Surface roughness values obtained vary as function of the spraying distance, presenting higher values at lower thermal spraying distances.