کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1656315 1517578 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Deposition, heat treatment and characterization of two layer bioactive coatings on cylindrical PEEK
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Deposition, heat treatment and characterization of two layer bioactive coatings on cylindrical PEEK
چکیده انگلیسی


• Uniform multilayer coatings are deposited on cylindrical polyether ether ketone.
• Coatings prepared by ion beam assisted deposition have high adhesion strength.
• Microwave and hydrothermal heat treatments crystallized the hydroxyapatite layer.
• Yttria-stabilized zirconia layer provides a thermal barrier for PEEK.

Polyether ether ketone (PEEK) rods were coated via ion beam asssisted deposition (IBAD) at room temperature. The coating consists of a two-layer design of yttria-stabilized zirconia (YSZ) as a heat-protection layer, and hydroxyapatite (HA) as a top layer to increase bioactivity. A rotating substrate holder was designed to deposit an even coating on the cylindrical surface of PEEK rods; the uniformity is verified by cross-sectional measurements using scanning electron microscopy (SEM). Deposition is followed by heat treatment of the coating using microwave annealing and autoclaving. Transmission electron microscopy (TEM) showed a dense, uniform columnar grain structure in the YSZ layer that is well bonded to the PEEK substrate, while the calcium phosphate layer was amorphous and pore-free in its as-deposited state. Subsequent heat treatment via microwave energy introduced HA crystallization in the calcium phosphate layer and additional autoclaving further expanded the crystallization of the HA layer. Chemical composition evaluation of the coating indicated the Ca/P ratios of the HA layer to be near that of stoichiometric HA, with minor variations through the HA layer thickness. The adhesion strength of as-deposited HA/YSZ coatings on smooth, polished PEEK surfaces was mostly unaffected by microwave heat treatment, but decreased with additional autoclave treatment. Increasing surface roughness showed improvement of bond strength.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 301, 15 September 2016, Pages 106–113
نویسندگان
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