The results of experimental study of nanoscale intermetallic formation in surface layer of a metal target at ion implantation are presented. To increase the thickness of the ion implanted surface layer the high intens...The results of experimental study of nanoscale intermetallic formation in surface layer of a metal target at ion implantation are presented. To increase the thickness of the ion implanted surface layer the high intensive ion implantation is used. Compared with the ordinary ion implantation, the high intensive ion implantation allows a much thicker modified surface layer. Pure polycrystalline nickel was chosen as a target. Nickel samples were irradiated with Al ions on the vacuum-arc ion beam and plasma flow source 'Raduga-5'. It was shown that at the high intensity ion implantation the fine dispersed particles of Ni3AI, NiAl intermetallic compounds and solid solution Al in Ni are formed in the nickel surface layer of 200 nm and thicker. The formation of phases takes place in complete correspondence with the Ni-AI phase diagram.展开更多
Investigation results of micro-arc wollastoniteecalcium phosphate(W-CaP)biocoatings on the pure titanium(Ti)and Zr-1wt.%Nb(Zr-1Nb)alloy were presented.The voltages of 150-300 V generate the micro-arc oxidation(MAO)pro...Investigation results of micro-arc wollastoniteecalcium phosphate(W-CaP)biocoatings on the pure titanium(Ti)and Zr-1wt.%Nb(Zr-1Nb)alloy were presented.The voltages of 150-300 V generate the micro-arc oxidation(MAO)process with the initial amplitude current of 150-550 A and 100-350 A for Ti and Zr-1Nb substrates,respectively.The identical dependencies of changes of the coating thickness,surface roughness and adhesion strength on the process voltage were revealed for the both substrates.The W-CaP coatings with the thickness of 10-11μm were formed on Ti and Zr-1Nb under the low process voltage of 130-150 V.Elongated wollastonite particles with the size in the range of 40-100μm were observed in such coatings.The structure of the coatings on Ti was presented by the X-ray amorphous and crystalline phases.The X-ray reflexes relating to the crystalline phases of Ti and wollastonite were observed only in XRD patterns of the coatings deposited under 130-200 V on Ti.While,the crystalline structure with phases of CaZr4(PO4)6,β-ZrP2O7,ZrO2,and Zr was detected in the coatings on Zr-1Nb.FT-IRS,XRD,SEM,and TEM data confirmed that the increase of the process voltage to 300 V leads to the dissociation of the wollastonite.No toxic effect of specimens on a viability,morphology and motility of human adipose-derived multipotent mesenchymal stem cells was revealed in vitro.展开更多
Bioactive calcium phosphate coatings were deposited by radio-frequency magnetron sputtering from biphasic targets of hydroxyapatite and tricalcium phosphate,sintered at different mass%ratios.According to Raman scatter...Bioactive calcium phosphate coatings were deposited by radio-frequency magnetron sputtering from biphasic targets of hydroxyapatite and tricalcium phosphate,sintered at different mass%ratios.According to Raman scattering and X-ray diffraction data,the deposited hydroxyapatite coatings have a disordered structure.High-temperature treatment of the coatings in air leads to a transformation of the quasi-amorphous structure into a crystalline one.A correlation has been observed between the increase in the Ca content in the coatings and a subsequent decrease in Ca in the biphasic targets after a series of deposition processes.It was proposed that the addition of tricalcium phosphate to the targets would led to a finer coating's surface topography with the average size of 78 nm for the structural elements.展开更多
文摘The results of experimental study of nanoscale intermetallic formation in surface layer of a metal target at ion implantation are presented. To increase the thickness of the ion implanted surface layer the high intensive ion implantation is used. Compared with the ordinary ion implantation, the high intensive ion implantation allows a much thicker modified surface layer. Pure polycrystalline nickel was chosen as a target. Nickel samples were irradiated with Al ions on the vacuum-arc ion beam and plasma flow source 'Raduga-5'. It was shown that at the high intensity ion implantation the fine dispersed particles of Ni3AI, NiAl intermetallic compounds and solid solution Al in Ni are formed in the nickel surface layer of 200 nm and thicker. The formation of phases takes place in complete correspondence with the Ni-AI phase diagram.
基金The work was conducted as part of the program of fundamental researches of the state academies of sciences(PFR SAS)for 2015e2017 No.23.2.5RFBR grant No.15e03e07659 and project No.16-15-10031 of Russian Science Foundation(in part of biological studies in vitro).
文摘Investigation results of micro-arc wollastoniteecalcium phosphate(W-CaP)biocoatings on the pure titanium(Ti)and Zr-1wt.%Nb(Zr-1Nb)alloy were presented.The voltages of 150-300 V generate the micro-arc oxidation(MAO)process with the initial amplitude current of 150-550 A and 100-350 A for Ti and Zr-1Nb substrates,respectively.The identical dependencies of changes of the coating thickness,surface roughness and adhesion strength on the process voltage were revealed for the both substrates.The W-CaP coatings with the thickness of 10-11μm were formed on Ti and Zr-1Nb under the low process voltage of 130-150 V.Elongated wollastonite particles with the size in the range of 40-100μm were observed in such coatings.The structure of the coatings on Ti was presented by the X-ray amorphous and crystalline phases.The X-ray reflexes relating to the crystalline phases of Ti and wollastonite were observed only in XRD patterns of the coatings deposited under 130-200 V on Ti.While,the crystalline structure with phases of CaZr4(PO4)6,β-ZrP2O7,ZrO2,and Zr was detected in the coatings on Zr-1Nb.FT-IRS,XRD,SEM,and TEM data confirmed that the increase of the process voltage to 300 V leads to the dissociation of the wollastonite.No toxic effect of specimens on a viability,morphology and motility of human adipose-derived multipotent mesenchymal stem cells was revealed in vitro.
基金The study was conducted as part of the program of fundamental research of the state academies of sciences(PFR SAS)for 2015e2017 No.23.2.5The project was supported by Marie Curie IRSES,project No.612691 of the EU Framework Programme-FP7The authors thank A.Sainova,Yu.Glushko,M.Surmeneva,and Prof.M.Chaikina for support to the research and fruitful discussion of the results.
文摘Bioactive calcium phosphate coatings were deposited by radio-frequency magnetron sputtering from biphasic targets of hydroxyapatite and tricalcium phosphate,sintered at different mass%ratios.According to Raman scattering and X-ray diffraction data,the deposited hydroxyapatite coatings have a disordered structure.High-temperature treatment of the coatings in air leads to a transformation of the quasi-amorphous structure into a crystalline one.A correlation has been observed between the increase in the Ca content in the coatings and a subsequent decrease in Ca in the biphasic targets after a series of deposition processes.It was proposed that the addition of tricalcium phosphate to the targets would led to a finer coating's surface topography with the average size of 78 nm for the structural elements.
