Functionally graded calcium phosphate coatings produced by ion beam sputtering/mixing deposition

• Published in: Biomaterials 2001-06, Vol.22 (12), p.1619-1626
• Main Authors: Wang, C.X, Chen, Z.Q, Wang, M, Liu, Z.Y, Wang, P.L, Zheng, S.X
• Format: Article
• Language: English
• Subjects: Argon; Biological and medical sciences; Calcium Phosphates; Coated Materials, Biocompatible - chemical synthesis; Coated Materials, Biocompatible - chemistry; Functionally graded coating; Hydroxyl-poly-calcium sodium phosphate; Indicators and Reagents; Ion beam sputtering/mixing deposition; Ions; Kinetics; Medical sciences; Microscopy, Atomic Force; Microscopy, Electron, Scanning; Microscopy, Electron, Scanning Transmission; Monolayer coating; Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects); Spectroscopy, Fourier Transform Infrared; Technology. Biomaterials. Equipments. Material. Instrumentation; Titanium; X-Ray Diffraction
• ISSN: 0142-9612; 1878-5905
• DOI: 10.1016/S0142-9612(00)00319-7

Ar + ion beam sputtering/mixing deposition was used to produce thin calcium phosphate coatings on titanium substrate from hydroxyl-poly-calcium sodium phosphate (HPPA) and HPPA+Ti targets. Three types of coatings (one type of monolayer coating and two types of functionally graded coating) were manufactured. It was found that as-sputtered coatings were amorphous. No distinct hydroxyl band was observed in the FTIR spectra, but new absorption bands were determined for CO 3 2−, which resulted during the deposition process. Compositional gradients from the surface to the interior (i.e. adjacent to the substrate) were achieved for the functionally graded coatings. Post-deposition heat treatment indicated that the bonding strength between the coating and the substrate was improved by the use of functionally graded structures.