Crystallographic texture in pulsed laser deposited hydroxyapatite bioceramic coatings

• Published in: Acta materialia Vol. 55; no. 1; pp. 131 - 139
• Main Authors: Kim, Hyunbin, Camata, Renato P., Lee, Sukbin, Rohrer, Gregory S., Rollett, Anthony D., Vohra, Yogesh K.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 2007; Elsevier Science
• Subjects: Applied sciences; Ceramics; Coating; Exact sciences and technology; Hydroxyapatite; Laser deposition; Metals. Metallurgy; Nonmetallic coatings; Production techniques; Surface treatment; Texture; Hydroxyapatite; Coating; Ceramics; Texture; Laser deposition; Pulsed laser; Biomaterial; Microstructure; Non metal coating; Ceramic materials; Surface treatment
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/j.actamat.2006.08.008

The orientation texture of pulsed laser deposited hydroxyapatite coatings was studied by X-ray diffraction techniques. Increasing the laser energy density of the KrF excimer laser used in the deposition process from 5 to 7 J/cm 2 increases the tendency for the c-axes of the hydroxyapatite grains to be aligned perpendicular to the substrate. This preferred orientation is most pronounced when the incidence direction of the plume is normal to the substrate. Orientation texture of the hydroxyapatite grains in the coatings is associated with the highly directional and energetic nature of the ablation plume. Anisotropic stresses, transport of hydroxyl groups and dehydroxylation effects during deposition all seem to play important roles in the texture development.