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Vickers and knoop Micro-hardness Behavior of Coarse-and Ultrafine-grained Titanium

Journal of Materials Science & Technology 2010年第10期26卷 904-907页

作者： k.p.sanosh A.Balakrishnan L.Francis T.N.kim Department of Information and Electronic Materials Engineering College of EngineeringPaichai University Laboratoire SIMAp GPM2 Grenoble-INPUJFCNRS 101 Rue de la PhysiqueBP46 38402 Saint Martin d'He' res CedexFrance University of Genova Department of Chemistry and Industrial Chemistry

The present study focuses on the relationship of hardness with grain size for commercially pure titanium （CpTi） and ultra fine grained titanium （UFG-Ti） produced by equal channel angular process （ECAp） of Cp-Ti）.Vickers and knoop indentations of UFG-Ti at different loads was ～2.5 times harder than those of Cp-Ti.Xray diffraction （XRD） analysis showed peak broadening in UFG-Ti due to reduced grain size and micro-lattice strains.Scanning electron microscopy （SEM） revealed that ECAp had reduced the grain size of Cp-Ti by ～10 times.Weibull statistics showed UFG-Ti with lower dispersion in hardness values compare to Cp-Ti indicating a more uniform microstructure.

关键词： Vickers knoop Hardness Ultrafine-grained Titanium

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An in vivo Evaluation of Ultra-fine Grained Titanium Implants

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Journal of Materials Science & Technology 2009年第4期25卷 556-560页

作者： S. Bindu k.p. sanosh k. Smetana A. Balakrishnan T.N. kim Department of Life Science and Genetic Engineering Paichai University Department of Information and Electronic Materials Engineering Paichai University Charles University 1st and 2nd Faculty of MedicineInstitute of Anatomy and Center of Cell Therapy and Tissue Repair

The present work focuses mainly on an in vivo evaluation of ultra fine grained titanium （UFG-Ti） obtained by severe plastic deformation （SpD）. The SpD on commercially produced Grade 2 titanium （Cp-Ti） resulted in the refinement of the grain size by several orders of magnitude. polished surfaces having similar roughness from both UFG-Ti and Cp-Ti were prepared. In vitro test revealed the presence of fibronectin, which was involved in the attachment of the cells to the substrate. phase contrast micrographs showed the highest signal of fibronectin in UFG-Ti, indicating that it is more cytocompatible than Cp-Ti. In vivo tests, by subcutaneous implantation of the metals in the rats showed the better biocompatibility of UFG-Ti over Cp-Ti. The improved biocompatibility of UFG-Ti was attributed to the presence of surface discontinuities （in the form of nano-defects）, surface energy, higher wettability, surface stress and stable TiO2 films, which increased the protein adsorption on the surface.

关键词： Surfaces Grain size Titanium In vivo Biocompatibility

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维普期刊数据库

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Sol-gel synthesis and characterization of hydroxyapatite nanorods

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particuology 2009年第6期7卷 466-470页

作者： sanosh kunjalukkal padmanabhan Avinash Balakrishnan Min-Cheol Chu Yong Jin Lee Taik Nam kim Seong-Jai Cho Department of Information and Electronic Materials Engineering College of EngineeringPaichai UniversityDaejeon 302-735Republic of Korea Division of Metrology for Emerging Technology Korea Research Institute of Standards and Science1 Doryong-DongYuseong-GuDaejeon 305-340Republic of Korea Division of Advanced Technology Korea Research Institute of Standards and ScienceDaejeon 305-340Republic of Korea

In the present study hydroxyapatite （HA） nano-hexagonal rods with 70-90 nm diameter and 400-500 nm length are synthesized using a simple sol-gel route with calcium nitrate and potassium dihydrogenphosphate as calcium and phosphorus precursors respectively. Deionized water was used as a diluting media for HA sol preparation and ammonia was used to adjust the pH = 9. After aging, the HA gel was dried at 60 ℃ and calcined at different temperatures ranging from 300 to 700 ℃. The dried and calcined powders were characterized for phase composition using X-ray diffractrometry, elemental dispersive X-ray and Fourier transform infrared spectroscopy. Rietveld analysis showed the calcined HA powders of high purity with a hexagonal unit cell structure. Calcination yielded HA nanopowders of increased particle size and crystallinity with increase in temperature. The particle size and morphology was studied using transmission electron microscopy. The aspect ratio （length to diameter ratio） of HA nanorods was measured to be between 6 and 7.

关键词： Hydroxyapatite Nanorods Sol-gel particle size Morphology

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