- citations in SCIndeks: 0
- citations in CrossRef:0
- citations in Google Scholar:[
 ]
- visits in previous 30 days:2
- full-text downloads in 30 days:2
|
|
|
2020, vol. 61, iss. 1, pp. 52-59
|
|
The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration
Mehanička i mikrostrukturna svojstva VPS-Ti porozne prevlake deponovane na podlogama od legure titana za osteointegraciju
aUniversity of Belgrade, Faculty of Technology and Metallurgy, Serbia bUniversity of Belgrade, Faculty of Agriculture, Serbia cUniversity of Belgrade, Faculty of Technology and Metallurgy, Innovation Center, Serbia dUniversity of Montenegro, Faculty of Mechanical Engineering, R. Montenegro
email: drmrdakmihailo@gmail.com
Project: Micromechanical criteria of damage and fracture (MESTD - 174004)
Development of covering and core production technology based on local raw materials for manufacturing of special coated electrodes designed for steel arc welding (MESTD - 34016)
Abstract
The topography of the surface of the deposited VPS-Ti coatings on substrate surfaces of implants relating to the roughness and porous structure plays a decisive role in the process of on growth of the implants to the bones i.e.osseointegration. Direct bone on growth has been successfully achieved by using micro rough coating surfaces, such as the use of vacuum plasma spraying VPS-Ti coatings. The aim of this study was to make a comprehensive review of the characterization of porous VPS-Ti coatings deposited on substrates of titanium alloy that will find application in orthopedics.One of the preferred features of the VPS process is the ability to achieve optimum macro and micro structure of the surface of implants by optimizing the spray parameters of the powder deposition and by the range of the powder granulation. In order to achieve an optimum surface roughness, open porosity and structure of VPS-Ti coatings conducted was the optimization of deposition of powder with a change in plasma current and powder carrier gas flow rate of (700 A, 35 l/min and 800A, 20 l/min). Lower intensity plasma current with a greater flow of powder heats and melts the powder particles less forming micro pores of a larger size and a higher proportion of open pores and vice versa higher plasma currents and reduced flow provide better melted particles forming a smaller share of micro pores and open porosity in the deposited layers. Image analysis showed that by optimization of parameters in the coatings open porosity can be formed ranging from 45% to 57%. By examining the properties of the deposited layers it was determined that the most optimal roughness and share of open pores for osseointegration have the Ti layers which have been deposited with the lowest amperage and highest flow of powder carrier gas.
Sažetak
Topografija površine deponovanih VPS-Ti prevlaka na podlogama implanata koja se odnosi na hrapavost i poroznu strukturu imaju odlučujuću ulogu u procesu srastanja implanata sa kostima odnosno osteointegraciju Direktno urastanje kostiju uspešno se posti e korišćenjem mikro grubih površina prevlaka, kao što je primena vakuum plazma sprej VPS - Ti prevlake. Cilj ovog rada je bio da se napravi sveobuhvatan pregled karakterizacija VPS-Ti poroznih prevlaka deponovanih na podlogama od legure titana koje će naći aplikaciju u ortopediji. Jedna od povoljnih osobina VPS procesa je mogućnost postizanja optimalne makro i mikro strukture površine implanata optimizacijom sprej parametara depozicije praha i rasponom granulacije praha. U cilju postizanja optimalne hrapavosti, otvorene poroznosti i strukture VPS-Ti prevlaka sprovedena je optimizacija depozicije praha sa promenom plazma struje i protokom nosećeg gasa praha (700 A, 35 l/min i 800A, 20 l/min) Ni a jačina plazma struje uz veći protok praha slabije progreva i topi čestice praha obrazujući mikro pore veće veličine i veći udeo otvorenih pora i obrnuto veća plazma struja i manji protok omogućuju bolje topljenje čestica uz formiranje manjeg udela mikro pora i otvorene poroznosti u deponovanim slojevima. Analizom slika ustanovljeno je da se sa optimizacijom parametara u prevlakama mo e formirati otvorena poroznost sa rasponom od 45% do 57% Ispitivanjem karakteristika deponovanih slojeva ustanovljeno je da najoptimalniju hrapavost i udeo otvorenih pora za osteointegraciju imaju slojevi Ti deponovani sa najni om ampera om i najvećim protokom nosećeg gasa praha.
|
|
|
|
References
|
|
|
*** (2009) ASTM F1854: Standard test method for stereological evaluation of porous coating on medical implants. West Conshohocken, PA: ASTM International
|
|
|
*** (1994) ASMI handbook: Materials properties handbook: Titanium alloys
|
|
|
*** (2008) ASTM C633-1(2008) standard test method for adhesion or cohesion strength of thermal spray coatings. Reapproved
|
|
 
|
Altankov, G., Grinnell, F., Groth, T. (1996) Studies on the biocompatibility of materials: Fibroblast reorganization of substratum-bound fibronectin on surfaces varying in wettability. Journal of Biomedical Materials Research, 30(3), 385-391
|
|
|
Bose, S., Roy, M., Bandyopadhyay, A. (2012) Recent advances in bone tissue engineering scaffolds. Trends in Biotechnology, 30(10), 546-554
|
|
|
Chen, S., Jones, J.A., Xu, Y., Low, H.Y., Anderson, J.M., Leong, K.W. (2010) Characterization of topographical effects on macrophage behavior in a foreign body response model. Biomaterials, 31(13), 3479-3491
|
|
|
Fabi, D.W., Levine, B.R. (2012) Porous coatings on metallic implant materials. in: ASM Handbook, Volume 23: Materials for Medical Devices, ASM International, p.307-319
|
|
|
Mariani, E., Lisignoli, G., Borzì, R.M., Pulsatelli, L. (2019) Biomaterials: Foreign bodies or tuners for the immune response?. International Journal of Molecular Sciences, 20(3). 636-636
|
|
|
Metco, O. (2017) Material product data sheet, pure titanium and titanium alloy powders thermal spray powders. DSMTS-0089.5
|
|
3
|
Mrdak, M., Bajić, N., Veljić, D., Rakin, M., Pekez, J., Karastojković, Z. (2016) Testing adhesive bond strength and fracture mechanisms of thicker and porous plasma spray coatings. in: VI International Conference Industrial Engineering and Environmental Protection 2016 (IIZS 2016), Zrenjanin: University of Novi Sad, Technical faculty 'Mihajlo Pupin, 249-253
|
|
5 
|
Mrdak, M., Lačnjevac, Č., Rakin, M. (2018) Mechanical and structural features of Nb coating layers deposited on steel substrates in a vacuum chamber. Zaštita materijala, vol. 59, br. 2, str. 167-172
|
|
5
|
Mrdak, M., Lačnjevac, Č., Rakin, M., Bajić, N. (2018) Characterization of tantalum coatings deposited using vacuum plasma spray process. Zaštita materijala, vol. 59, br. 4, str. 489-494
|
|
1
|
Mrdak, M., Lačnjevac, Č., Rakin, M., Bajić, N., Veljić, D. (2019) Karakterizacija plazma sprej bioinertne prevlake Al2O328tež.%MgO. Zaštita materijala, vol. 60, br. 1, str. 44-49
|
|
|
Wertz, C.F., Santore, M.M. (2001) Santore effect of surface hydrophobicity on adsorption and relaxation of kinetics of albumin and fibrinogen: Single-species and cpmpetitive behaviour. Langmuir, 17(10), 3006-3016
|
|
|
Winkler-Gniewek, W. (1989) Die Plasmapore-Beschichtung für die zementlose Verankerung von Gelenkendoprothesen. in: Wissenschaftliche Informationen, Vormals Jetter und Scheerer (Tuttlingen), Tom 22
|
|
|
|
|