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Tribo-m.chanical and Electrochem.cal Properties of Carbonitrided 316 Austenitic Stainless Steel by rf Plasm. for Biom.dical Applications

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Advances in m.terials Physics and Chem.stry 2018年第9期8卷 358-377页

作者： F. m. El-Hossary m. raaif A. m. Abd El-Rahm.n m. Abo EL-Kassem Physics Departm.nt Faculty of Science Sohag University Sohag Egypt

AISI 316 austenitic stainless steel was carbonitrided using rf plasm. with purpose of using low-cost orthopedic im.lant m.terials in biom.dical applications besides the m.nufacturing requests. The plasm. treatm.nt process was accom.lished at low working gas pressure of 0.075 m.ar in nitrogen-acetylene gaseous m.xture. The plasm.-processing tim. was fixed at 10 m.n while the plasm.-processing power was varied from.450 to 650 watt. The effect of plasm. treatm.nt power on the structure, tribological, m.chanical, electrochem.cal and biocom.atibility of AISI 316 has been investigated. The structural results dem.nstrated the form.tion of nitrogen and carbon solid solutions, chrom.um.nitride, iron carbide and iron nitride phases in the treated sam.les. The m.crohardness of the treated layer increases with increasing the processing power to reach a m.xim.m.value of approxim.tely 1300 HV0.1 at 600 W which represents m.re than 6-folds increase in m.crohardness in com.arison with the untreated m.trix. The wear and corrosion resistance of the treated AISI 316 were enhanced com.ared to the untreated one. The friction coefficient was reduced from.nearly 0.5 for the untreated substrate to nearly 0.3 for the carbonitrided sam.le. The surface energy and wettability of the carbonitrided sam.les were augm.nted as the plasm.-processing power increased. Furtherm.re, the num.ers of grown m.senchym.l stem.cells are higher for carbonitrided sam.les com.ared to the untreated one. The form.tion of nitrogen and carbon solid solution, chrom.um.nitride, iron nitride and iron carbide hard phases after carbonitriding process is responsible for achieving good m.chanical, tribological, biocom.atibility and electrochem.cal properties for AISI 316 alloys.

关键词： Plasm.-m.terial Interactions 52.40.Hf Surface Hardening 81.65.Lp m.chanical Properties 62.20.Qp Surface Energy 68.35.m. Biocom.atibility 87.85.Jj

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Effect of rf Plasm. Carbonitriding on the Biocom.atibility and m.chanical Properties of AISI 321 Austenitic Stainless Steel

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Advances in m.terials Physics and Chem.stry 2014年第2期4卷 33-42页

作者： F. m. El-Hossary A. m. Abd El-Rahm.n m. raaif A. A. Seleem.m. Abo El-Kassem Physics Departm.nt Faculty of Science Sohag University Sohag Egypt Zoology Departm.nt Faculty of Science Sohag University Sohag Egypt

AISI 321 austenitic stainless steel was treated using rf plasm. carbonitriding with the intention of use low-cost orthopedic im.lant m.terial in biom.dical applications. The treatm.nt process was carried at low working gas pressure of 0.075 m.ar in nitrogen-acetylene gaseous m.xture to form.a superficial carbonitrided layer. The sam.les were treated using rf inductively coupled at a fixed plasm.-processing power of 500 W and for a processing tim. varied from.4 to 20 m.nutes. The m.crostructural, m.chanical and tribological properties of the untreated and treated sam.les were studied. The surface hardness is im.roved by rf plasm. carbonitriding to a m.xim.m.of 1468 HV0.1 for plasm.-processing tim. of 16 m.n. To evaluate the biocom.atibility perform.nce, the blood was cultured in RPm. m.dia to test the adhesion of blood cells on the untreated and treated sam.les. It has been found that the blood adhesion on the treated sam.les is enhanced with increasing the plasm.-processing tim.. The contact angle of the carbonitrided surfaces is decreased to lower values com.ared to that of the untreated surface. Furtherm.re, the carbonitrided layer in-vitro corrosion was tested in Ringer’s solution. A degradation in the corrosion resistance was observed for the sam.le carbonitrided at low plasm. processing tim. of 4 m.n. However, the corrosion resistance increased to a m.xim.m.value at a plasm.-processing tim. of 8 m.n then gradually decreased with further increase of plasm. processing tim..

关键词： Plasm. Carbonitriding Surface Energy Wear Corrosion Resistance Blood Culture Protein Adsorption

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Properties of Titanium.Oxynitride Prepared by RF Plasm.

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Advances in Chem.cal Engineering and Science 2015年第1期5卷 1-14页

作者： Fayez m. El-Hossary Niem.t Z. Negm.Ahm.d m. Abd El-Rahm.n m.ham.d raaif Alzahraa A. Abd Elm.la Physics Departm.nt Faculty of Science Sohag University Sohag Egypt

Titanium.oxynitrides com.ine the properties of m.tallic oxides and nitrides. In this presentation, titanium.was oxynitrided using inductively coupled RF plasm. in a gas m.xture containing 80% N2 and 20% O2. The effect of plasm.-processing power from.350 up to 550 W on m.crostructure, m.chanical, tribological, wettability and electrochem.cal properties of the oxynitrided titanium.was exam.ned using different characterizations and testing techniques. The results dem.nstrated the form.tion of TiO, TiO2 rutile phase, TiNxOy and Ti2N as a result of plasm. oxynitriding. The m.cro-hardness of the oxynitrided layers increases up to 766 HV0.1 as the plasm.-processing power increases up to 550 W. The wear and corrosion resistance are im.roved for oxynitrided titanium.in com.arison with untreated sam.les. m.reover, the friction coefficient decreases from.nearly 0.75 for the pure titanium.to nearly 0.3 for oxynitrided titanium. The obtained data show an increase of surface energy and wettability of titanium.oxynitride as the plasm. power increases. The form.tion of hard oxide and oxynitride phases and the transform.tion of TiO2 from.anatase to rutile structure at relatively high tem.erature are the m.in reasons for the good physical and electrochem.cal properties of titanium.oxynitride.

关键词： Plasm. Oxynitriding Titanium Corrosion Wear Hardness Surface Energy and Wettability

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