3967

3745

كارشناسي ارشد

شناسايي و انتخاب مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1386

يازده، 109،[II] ص: مصور، جدول، نمودار

ص.ع.به: فارسي و انگليسي

فخرالدين اشرفي زاده

محمد حسن فتحي

21/3/87

محمد رضا سائري، احمد ساعتچي

مهندسي مواد

ID3745

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

Characterization of Thermal Oxidation Process and Chemical Pre treatment of Titanium for Biomedical ApplicationsAbstractIn this research work the influence of thermal oxidation treatment on corrosionbehavior bioactivity and improving of surface characteristics of titanium has beeninvestigated Thermal oxidation treatments were carried out at 400 800 C by aheating rate of 5 C min in a conventional muffle furnace under air atmosphere for1 h followed by cooling in the furnace The chemical treatment of samples wasperformed before thermal oxidation process For this purpose some samples werecompletely dipped in acidic solution for a few minutes Others were soaked in 5MNaOH solutions at 60 C for 10 h Corrosion resistance Tofel curves and bioactivitywere investigated in simulated body fluid For the evaluation of surface characteristicsof oxidized samples instruments such as SEM equipped with EDS XRD opticalmicroscopy observation hardness test TGA GDOS and adhesion tests using a scotchtape were used It is proposed that thermal oxidation process can induce an adherentoxide layer supported by an oxygen diffusion zone beneath it With increasingoxidation temperature the hardness parameter of surface was increased Thetreatment can also improve corrosion resistance for both types of chemical treatments The effect of oxidation processing on bioactivity of samples which were dipped inNaOH solution is higher than other specimens The maximum corrosion resistanceand bioactivity were obtained at 600 C It is concluded that thermal oxidation oftitanium can be successfully done in air This treatment can greatly influence bothcorrosion resistant and bioactivity behaviour

فخرالدين اشرفي زاده

محمد حسن فتحي

محمد رضا سائري، احمد ساعتچي