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Direct ink writing to fabricate porous acetabular cups from titanium alloy

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Bio-Design and Manufacturing 2023年第2期6卷 121-135页

作者： Naima Valentin Weijian Hua ashish k.kasar Lily Raymond Pradeep L.Menezes Yifei Jin Mechanical Engineering Department University of NevadaRenoRenoNV 89557USA

Acetabular cups,which are among themost important implants in total hip arthroplasty,are usually made from titanium alloys with high porosity and adequate mechanical *** current three-dimensional(3D)printing approaches to fabricate customized acetabular cups have some inherent disadvantages such as high cost and energy consumption,residual thermal stress,and relatively low ***,in this work,a direct ink writing method was developed to print a cup structure at room temperature,followed by multi-step heat treatment to form microscale porous structure within the acetabular *** method is facilitated by the development of a self-supporting titanium-6 aluminum-4 vanadium(Ti64)ink that is composed of Ti64 particles,bentonite yield-stress additive,ultraviolet curable polymer,and *** effects of Ti64 and bentonite concentrations on the rheological properties and printability of inks were systematically ***,the printing conditions,geometrical limitations,and maximum curing depth were ***,some complex 3D structures,including lattices with different gap distances,honeycomb with a well-defined shape,and an acetabular cup with uniformly distributed micropores,were successfully printed/fabricated to validate the effectiveness of the proposed method.

关键词： Acetabular cup Direct ink writing Titanium alloy Bentonite Heat treatment

Surface modification of magnesium alloys using thermal and solid-state cold spray processes:Challenges and latest progresses

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Journal of Magnesium and Alloys 2022年第8期10卷 2025-2061页

作者： Mohammadreza Daroonparvar Hamid Reza Bakhsheshi-Rad Abbas Saberi Mahmood Razzaghi ashish k kasar Seeram Ramakrishna Pradeep L.Menezes Manoranjan Misra Ahmad Fauzi Ismail Safian Sharif Filippo Berto Department of Mechanical Engineering University of NevadaRenoNV89501USA Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117576Singapore Department of Chemical and Materials Engineering University of NevadaRenoNV89501USA Advanced Membrane Technology Research Center(AMTEC) Universiti Teknologi MalaysiaJohor Bahru 81310JohorMalaysia Faculty of Engineering Universiti Teknologi MalaysiaJohor Bahru 81310JohorMalaysia Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology7491 TrondheimNorway

Potential engineering applications of magnesium(Mg)and Mg-based alloys,as the lightest structural metal,have made them a popular subject of ***,the inferior corrosion and wear characteristics significantly limit their application *** is widely recognized that surface treatment is the most commonly utilized technique for remarkably improving a substrate’s surface *** methods have been introduced for the surface treatment of Mg and Mg-based alloys to improve their corrosion behavior and tribological *** these,thermal spray(TS)technology provides several methods for deposition of various functional metallic,ceramic,cermet,or other coatings tailored to particular *** researches have shown the tremendous potential for thermal spray coated Mg alloys for biomedical and industrial *** this context,the cold spray(CS)method,as a comparatively new TS coating technique,can generate the coating layer using kinetic energy rather than combined thermal and kinetic energies,like the high-velocity oxy-fuel(HVOF)spray ***,the CS process,as a revolutionary method,is able to repair and refurbish with a faster turnaround time;it also provides solutions that do not require dealing with the thermal stresses that are part of the other repair processes,such as welding or other TS processes using a high-temperature *** this review paper,the recently designed coatings that are specifically applied to Mg alloys(primarily for industrial applications)employing various coating processes are *** of the increased utilization of CS technology for both 3D printed(additively manufactured)coatings and repair of structurally critical components,the most recent CS methods for the surface treatment,repair,and refurbishment of Mg alloys as well as their benefits and restrictions are then discussed and reviewed in ***,the prospects of this field of study are briefly discussed,along with a summa

关键词： Mg-based alloys Surface modification Thermal and cold spray processes Corrosion behavior Wear resistance

Pitting corrosion behavior and corrosion protection performance of cold sprayed double layered noble barrier coating on magnesium-based alloy in chloride containing solutions

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Journal of Magnesium and Alloys 2023年第9期11卷 3099-3119页

作者： M.Daroonparvar A.Helmer A.M.Ralls M.U.Farooq khan A.k.kasar R.k.Gupta M.Misra S.Shao P.L.Menezes N.Shamsaei National Center for Additive Manufacturing Excellence Auburn UniversityAuburnAL 36849USA Department of Mechanical Engineering Auburn UniversityAuburnAL 36849USA Department of Materials Science and Engineering College of EngineeringNorth Carolina State University911 Partners WayRaleighNC 27695USA Department of Mechanical Engineering University of Nevada RenoRenoNV 89501USA Department of Nuclear Engineering and Radiological Sciences University of MichiganAnn ArborMI 48105 USA Department of Chemical and Materials Engineering University of Nevada RenoNV 89501USA

Nitrogen processed, cold sprayed commercially pure(CP)-Al coatings on Mg-based alloys mostly lack acceptable hardness, wear resistance and most importantly are highly susceptible to localized corrosion in chloride containing solutions. In this research, commercially pure α-Ti top coating having good pitting potential(~1293 mV_(SCE)), high microhardness(HV_(0.025): 263.03) and low wear rate was applied on a CP-Al coated Mg-based alloy using high pressure cold spray technology. Potentiodynamic polarization(PDP) curves indicated that the probability of transition from metastable pits to the stable pits for cold spayed(CS) Al coating is considerably higher compared to that with the CS Ti top coating(for Ti/Al/Mg system). In addition, CS Ti top coating was in the passivation region in most pH ranges even after 48 h immersion in 3.5 wt% NaCl solution. The stored energy in the CS Ti top coating(as a passive metal) was presumed to be responsible for the easy passivation. Immersion tests indicated no obvious pits formation on the intact CS Ti top coating surface and revealed effective corrosion protection performance of the CS double layered noble barrier coatings on Mg alloys in 3.5 wt% NaCl solution even after 264 h.

关键词： Ti coating Mg alloys Localized corrosion Passivity Dislocation density Crystallite size

The effect on wound healing of pazopanib and bevacizumab compared with corticosteroid in experimental glaucoma filtration surgery

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International Journal of Ophthalmology(English edition) 2018年第12期11卷 1909-1915页

作者： Sabiha Gungor kobat Fatma Ulku Celiker Adile Ferda Dagli kader kasar Department of Ophthalmology Elazig Health Sciences University Department of Ophthalmology School of Medicine Firat University Department of Pathology School of Medicine Firat University Department of Ophthalmology Ordu State Hospital

AIM: To compare the effects of bevacizumab and pazopanib with corticosteroids on wound healing after trabeculectomy. METHODS: In the study, 35 New Zealand white rabbits were randomly divided into five groups. Apart from the first group, limbus-based trabeculectomy was performed for the eyes of rabbits. No postoperative treatment was administered for group Ⅰ. Topically administered saline, prednisolone acetate(1%), bevacizumab 5 mg/mL, pazopanib 5 mg/mL for group Ⅱ, Ⅲ, Ⅳ and Ⅴ respectively were applied for groups 6 h daily for 28 d. On day 28 of the experiment, eyes were enucleated and histologically and immunohistochemically ***: The fibroblast counts of groups Ⅳ and Ⅴ were determined to be lower than those of groups Ⅱ and Ⅲ(P0.05). The immunohistochemical staining intensity of fibroblast growth factor β(FGF-β) and vascular endothelial growth factor(VEGF) was determined to be lower in groups Ⅳ and Ⅴ than in groups Ⅱ and Ⅲ(P0.05). The platelet derived growth factor β(PDGF-β) intensity was lower in group Ⅴ than in groups Ⅱ, Ⅲ and Ⅳ(P0.05). CONCLUSION: Bevacizumab and pazopanib might be good alternatives of corticosteroid treatment on delaying wound healing in glaucoma surgery.

关键词： trabeculectomy wound healing corticosteroid bevacizumab pazopanib