Selected Abstracts of Thermal Spray Literature
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Selected Abstracts of Thermal Spray Literature Reprinted with permission from Elsevier Engineering Information, New York, NY
Applications Biomaterials and Bioactive Materials Behavior of plasma-sprayed hydroxyapatite coatings onto carbon/carbon composites in simulated body fluid. Two types of hydroxyapatite (HA) coatings onto carbon/carbon composite (C/C composites) substrates, deposited by plasma spraying technique, were immersed in a simulated body fluid (SBF) in order to determine their behavior in conditions similar to the human blood plasma. Calcium ion concentration, pH value, microstructure, and phase compositions were analyzed. Results demonstrated that both the crystal Ca-P phases or the amorphous HA do dissolve slightly, and the dissolution of CaO phases in SBF was evident after 1 day of soaking. The calcium-ion concentration was decreased and the pH value of SBF was increased with the increasing of the immersing time. The precipitation was mainly composed of HA, which was verified by X-ray diffraction (XRD) and electron-probe microanalyzer. Keywords: body fluids, calcium, carbon composites, coatings, concentration (process), hydroxyapatite, hydroxyapatite coating, plasma spraying, x ray diffraction analysis, simulated body fluid J.-L. Sui, W. Bo, Z. Hai, N. Cao, and M.-S. Li, Center of Engineering and Education, Beijing Institute of Petrochemical Technology, Huangcun Town, Beijing, 102617, China. Cited: Surf. Rev. Lett., 2007, Dec, 14(6), p 1073-1078. ISSN 0218-625X. Grit blasting of Ti-6Al-4V alloy: Optimization and its effect on adhesion strength of plasma-sprayed hydroxyapatite coatings. The effect of grit blasting parameters on the surface roughness of Ti-6Al-4V alloy as the substrate for plasma-sprayed hydroxyapatite (HA) coatings was examined using the factorial and Taguchi designs of experiments. In this study, two grit materials (Al2O3 and SiO2) each at two sizes, and two types of blasting systems (pressure and suction) were used. An equivalent surface roughness of 3.51 lm was obtained in three optimum conditions. The results of the Taguchi designed experiments were analyzed using signal to noise ratio. The tensile bonding strength of HA coatings deposited on the roughened substrates at the three different optimum conditions was measured by the standard adhesion test (ISO 13779-4). As the crystallinity of the coating at the interface, evaluated by the XRD analysis, reduced the bonding strength of the coatings was increased. These findings suggest that the substrate surface topography significantly influences the properties of the coating at the interface. Keywords: aluminum alloys, blasting systems, bond strength (materials), grit blasting, hydroxyapatite, optimization, plasma-sprayed hydroxyapatite (HA) coatings, plasma spraying, silica, surface roughness, Taguchi designs, Taguchi methods, titanium alloys, x-ray diffraction Z. Mohammadi, A.A. Ziaei-Moayyed, and A.S.-M. Mesgar, Materials Science and Engineering Department, Sharif University of Technology, Tehran, Iran. Cited: J. Mater. Process. Te
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