کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11026530 | 1666374 | 2018 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Multi-objective particle swarm optimization of EDM parameters to deposit HA-coating on biodegradable Mg-alloy
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
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چکیده انگلیسی
The present research work is aimed to discuss a novel method of depositing hydroxyapatite coats, with interconnected pores, on the surface of bio-degradable MgZnMn alloy by using hydxroxyapatite (HA) powder mixed electric discharge machining (HAM-EDM) process. The parameters of HAM-EDM process has been optimized using multi-objective particle swarm optimization (MO-PSO) technique to determine the optimal levels of concentration of hydroxyapatite powder (CHA), peak-current (Ip), pulse-on (Ton), and pulse-off (Toff). The surface roughness (SR), thickness of recast layer (RLT), and micro-hardness (MH) were chosen as output response characteristics. The experiments were performed according to L27 orthogonal array and an empirical model has been developed to interpret the co-relation amongst input and output parameters. A number of optimal solutions (â¼100) were obtained by MO-PSO technique, where all responses were optimized. Among them, best optimal condition is to deposit biomimetic HA-containing layer with low SR (0.70â¯Î¼m), low RLT (11.85â¯Î¼m) and high MH (246 HV) was CHAâ¯=â¯5.28â¯g/l, Ipâ¯=â¯3.48 A, Tonâ¯=â¯40.33â¯Î¼s, and Toffâ¯=â¯109.29â¯Î¼s? Further, the specimens produced were characterized, morphologically and topologically, and revealed the existence of hydroxyapatite (HA) layer with interconnected pores of 5-10â¯Î¼m size. The EDS spectrum showed that presence of Ca, P, and O on the modified surface, which conferred the deposition of HA-layer on the surface. The XRD pattern investigations of modified surface confirmed the formation of various biocompatible phases, which enhanced the mechanical properties, corrosion and osseintegration characteristics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 158, December 2018, Pages 180-190
Journal: Vacuum - Volume 158, December 2018, Pages 180-190
نویسندگان
Chander Prakash, Sunpreet Singh, Manjeet Singh, Kartikey Verma, Babulal Chaudhary, Subhash Singh,