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Title: Increasing fatigue endurance of hydroxyapatite and rutile plasma sprayed biocomponents by controlling deposition in-flight properties
Authors: Cizek, J.
Kovarik, O.
Siska, F.
Bensch, J.
Cupera, J.
Matejkova, M.
Siegl, J.
Chraska, T.
Khor, Khiam Aik
Keywords: Engineering::Aeronautical engineering
Issue Date: 2019
Source: Cizek, J., Kovarik, O., Siska, F., Bensch, J., Cupera, J., Matejkova, M., Siegl, J., Chraska, T. & Khor, K. A. (2019). Increasing fatigue endurance of hydroxyapatite and rutile plasma sprayed biocomponents by controlling deposition in-flight properties. ACS Biomaterials Science & Engineering, 5(4), 1703-1714.
Journal: ACS Biomaterials Science & Engineering
Abstract: Three sets of hydroxyapatite and rutile-TiO₂ coatings were plasma sprayed onto metallic substrates. The spray parameters of the sets were modified so as to obtain different in-flight temperatures and velocities of the powder particles within the plasma jet (ranging from 1778 to 2385 K and 128 to 199 ms⁻¹, respectively). Fatigue endurance of the coated specimens was then tested. The samples were subjected to a symmetric cyclical bend loading, and the crack propagation was monitored until it reached a predefined cross-section damage. The influence of the coating deposition was evaluated with respect to a noncoated reference set and the in-flight characteristics. Attributed to favorable residual stress development in the sprayed samples, it was found that the deposition of the coatings generally led to a prolongation of the fatigue lives. The highest lifetime increase (up to 46% as compared to the noncoated set) was recorded for the coatings deposited under high in-flight temperature and velocity. Importantly, this was achieved without significantly compromising the microstructure or phase composition of the deposited HA and TiO₂ layers.
ISSN: 2373-9878
DOI: 10.1021/acsbiomaterials.8b01545
Rights: © 2019 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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