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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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Biodegradation of Polymethylmethacrylate Bone Cement May Not Be a Serious Issue in Total Hip Arthroplasty—Retrieval Study for knoop Hardness and Young’s Modulus

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Open Journal of Orthopedics 2013年第6期3卷 269-277页

作者： Masaaki Maruyama William N. Capello Department of Orthopaedic Surgery Indiana University Medical Center Clinical Building Suite Indianapolis USA Department of Orthopaedic Surgery Shinonoi General Hospital Nagano Japan Department of Orthopaedic Surgery Shinonoi General Hospital Nagano Japan.

Introduction: To investigate a long-term in vivo deterioration of polymethylmethacrylate (PMMA) bone cement over time, we evaluated retrieved PMMA cement in terms of chemical elements presenting in the cement using energy dispersive analysis of X-rays;knoop hardness;and the Young’s modulus using scanning acoustic microscopy. Materials and Methods: For mechanical evaluation, we could neglect the influences of entrapped air bubbles or blood by the use of small specimens. The study was based on thirteen cement samples (six used in the acetabulum and seven in the femur) derived from eight patients (age at revision surgery: mean 72.5, range 68 to 79). All of these samples were Simplex-P?cement. They were functioning well at least ten years after the previous surgery. Duration until revision surgery was ranged 12 to 25 years (average, 17.4 years). The reason for revision was aseptic mechanical loosening. Twenty samples of Simplex-Preg;cement were served by manually mixing as a control. Results: The average of the hardness of the cement was 17.0 ± 1.2 (range, 13.4-20.6). In the control, the hardness was 17.8 ± 1.5 (range, 14.0-24.6). There was no significant difference between these values. The mean of Young’s modulus of the cement was 5.61 ± 0.19 GPa (range, 5.09-6.10). In the control, the modulus was 6.04 ± 0.13 GPa (range, 5.68-6.45). Although the modulus was significantly less than that of the control, there was only 7% decrease in average between twelve and twenty-five years in vivo. Conclusions: Our results suggest that long-term implantation and functional loading in vivo may not be the limiting factor in the mechanical integrity of the bone cement.

关键词： Polymethylmethacrylate Bone Cement Biodegradation Total Hip Arthroplasty Retrieval Study knoop Hardness Young’s Modulus

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涂料对玻璃离子体粘固粉表面处理的影响——卢氏(knoop)硬度和抗磨耗试验

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国际口腔医学杂志 1991年第5期 317-317页

作者：邓惠姝

在玻璃离子体粘固粉(以下简称玻粘)硬固初期,防止它内部失水和水份从外部进入对玻粘充填的预后至关重要。故有用涂料涂布玻粘充填物表面以保护和增加美观的报告.本文作者等研究了用粘接剂和树脂表面上光剂涂布玻粘表面对玻粘机械性能(... 详细信息

在玻璃离子体粘固粉(以下简称玻粘)硬固初期,防止它内部失水和水份从外部进入对玻粘充填的预后至关重要。故有用涂料涂布玻粘充填物表面以保护和增加美观的报告.本文作者等研究了用粘接剂和树脂表面上光剂涂布玻粘表面对玻粘机械性能(硬度和耐磨性)的影响。结果:涂光敏型树脂表面上光剂的玻粘硬度显

关键词：玻璃离子体粘固粉磨耗试验 knoop 涂料

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