| Title | Adhesion and microstructural characterization of plasma-sprayed hydroxyapatite/glass ceramic coatings onto Ti-6Al-4V substrates |
| Publication Type | Journal Article |
| 1998 |
| Authors | Silva, PL, Santos, JD, Monteiro, FJ, Knowles, JC |
| Journal | Surface and Coatings TechnologySurf. Coat. Technol. |
| Volume | 102 |
| Issue | 3 |
| Pagination | 191 - 196 |
| Date Published | 1998/// |
| 02578972 (ISSN) |
| Adhesion, Ceramic coatings, Characterization, coating, Hydroxyapatite glass ceramic coatings, materials testing, Mechanical properties, Microstructure, Phosphates, Plasma spraying, Stresses, Titanium aluminum vanadium substrates, X ray diffraction analysis, X-Ray Diffraction |
| Commercial hydroxyapatite (HA), Ca 10(PO
4)
6(OH)
2, powders were reinforced with 4% of a CaO-P
2O
5 based glass during its sintering process. Double layered coatings were obtained by Plasma Spraying and composed of 50 μm commercial HA, followed by a 50 μm (HA)/P
2O
5-CaO based glass composite coating. Samples were characterized by X-ray diffraction (XRD) analysis and it was shown that they were constituted of an HA matrix with small traces of tricalcium phosphate (β-TCP) phase. The XRD spectra were quite similar to those of commercial HA coatings. For coating to substrate adhesion two different tests were performed: adhesion tests according to ASTM C 633-79 and ASTM D 1002-83 standards. Higher values were obtained for ASTM C 633-79 than for ASTM D 1002-83, 35 and 15 MPa, respectively. This behavior is discussed in terms of the different stress effort applied to specimens. The results obtained with ASTM C 633-79 show that these double layered satisfy the stress requirements for load bearing biomedical applications. © 1998 Published by Elsevier Science S.A.
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