effects of sp2/sp3 ratio and hydrogen content on in vitro bending and frictional performance of dlc-coated orthodontic stainless steels

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ID: 173087
2018
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Abstract
This study investigated a diamond-like carbon (DLC) coating formed on stainless steels (disk and wire specimens) using a plasma-based ion implantation/deposition method with two different parameters (DLC-1, DLC-2). These specimens were characterized using high-resolution elastic recoil analysis, microscale X-ray photoelectron spectroscopy and nanoindentation testing to determine the hydrogen content, sp2/sp3 ratio and mechanical properties of the coating. Three-point bending and frictional properties were estimated. DLC-1 had a diamond-rich structure at the external surface and a graphite-rich structure at the inner surface, while DLC-2 had a graphite-rich structure at the external surface and a diamond-rich structure at the inner surface. Mean mechanical property values obtained for the external surface were lower than those for the inner surface in both types of DLC-coated specimens. The hydrogen content of DLC-2 was slightly higher versus DLC-1. Both DLC-coated wires produced a significantly higher elastic modulus according to the three-point bending test versus the non-coated wire. DLC-2 produced significantly lower frictional force than the non-coated specimen in the drawing-friction test. The coating of DLC-1 was partially ruptured by the three-point bending and drawing-friction tests. In conclusion, the bending and frictional performance of DLC-coated wire were influenced by the hydrogen content and sp2/sp3 ratio of the coating.
Reference Key
muguruma2018coatingseffects Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Takeshi Muguruma, Masahiro Iijima, Masahiro Kawaguchi, Itaru Mizoguchi
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Journal die pharmazie
Year 2018
DOI
10.3390/coatings8060199
URL
http://www.mdpi.com/2079-6412/8/6/199
Keywords
surface modification civil engineering (general)

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