Details

Autor(en) / Beteiligte

• Ding, S.J
• Su, Y.M
• Ju, C.P
• Chern Lin, J.H

Titel

Structure and immersion behavior of plasma-sprayed apatite-matrix coatings

Ist Teil von

• Biomaterials, 2001-04, Vol.22 (8), p.833-845

Ort / Verlag

Oxford: Elsevier Ltd

Erscheinungsjahr

2001

Link zum Volltext

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• The microstructure and properties of a series of plasma-sprayed coatings from sinter-granulated powders fabricated from SiO 2, CaO, P 2O 5 and Na 2O-containing HA composite powders on Ti–6Al–4V substrate were reported. The immersion behavior of these coatings in a simulated body fluid (SBF) was also investigated. The results showed that sinter-granulated apatite-matrix powders were irregularly shaped and appeared quite similar. XRD patterns showed that during fabrication of the powders, P 2O 5 and SiO 2 enhanced the decomposition of HA structure, while CaO and Na 2O did not. Reasonably high bond strengths (45–50 MPa) were obtained from all coatings. The plasma spray process itself enhanced the decomposition of apatite and chemical reactions among different phases. When immersed in SBF, the intensities of such phases as α- and β-TCP in all coatings decreased with immersion time and an apatite precipitation took place on all coating surfaces. The immersed SiO 2- and CaO-containing HA (HSC) coating had the highest rate of apatite precipitation among all coatings. The variations in calcium ion concentration in simulated body fluid indicated that the HSC-immersed solution reached its maximal Ca concentration the earliest, while the HSCP (HA, SiO 2, CaO and P 2O 5)-immersed solution reached its maximum the latest.