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The Effect of Coating Density on Functional Properties of SiNx Coated Implants.

Artikel i vetenskaplig tidskrift
Författare Luimar Correa Filho
Susann Schmidt
Alejandro López
Mathilde Cogrel
Klaus Leifer
Håkan Engqvist
Hans Högberg
Cecilia Persson
Publicerad i Materials (Basel, Switzerland)
Volym 12
Nummer/häfte 20
ISSN 1996-1944
Publiceringsår 2019
Publicerad vid
Språk en
Länkar dx.doi.org/10.3390/ma12203370
www.ncbi.nlm.nih.gov/entrez/query.f...
Ämneskategorier Biomaterialvetenskap

Sammanfattning

Ceramic coatings may be applied onto metallic components of joint replacements for improved wear and corrosion resistance as well as enhanced biocompatibility, especially for metal-sensitive patients. Silicon nitride (SiNx) coatings have recently been developed for this purpose. To achieve a high coating density, necessary to secure a long-term performance, is however challenging, especially for sputter deposited SiNx coatings, since these coatings are insulating. This study investigates the time-dependent performance of sputter-deposited SiNx based coatings for joint applications. SiNx coatings with a thickness in the range of 4.3-6.0 µm were deposited by reactive high power impulse magnetron sputtering onto flat discs as well as hip heads made of CoCrMo. SiNx compositional analysis by X-ray photoelectron spectroscopy showed N/Si ratios between 0.8 and 1.0. Immersion of the flat disks in fetal bovine serum solution over time as well as short-term wear tests against ultra-high molecular weight polyethylene (UHMWPE) discs showed that a high coating density is required to inhibit tribocorrosion. Coatings that performed best in terms of chemical stability were deposited using a higher target power and process heating.

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