Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"CoCr"”.
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Charakterizace žárově stříkaného kovokeramického WC-CoCr povlaku na hořčíkové slitině AZ91
… bakalářské práce je hodnocení kovokeramického WC-CoCr povlaku na hořčíkové slitině AZ91 z hlediska mikrostruktury, chemického a fázového složení a mechanických vlastností. Depozice byla provedena metodou HVOF (High Velocity Oxy-Fuel). Teoretická část je věnována hořčíkovým slitinám se zaměřením na …
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The Effect of Particle Surface Area to Volume Ratio on Ion Release from CoCr Spheres
In 2005, over 200,000 Americans underwent a hip arthroplasty, the replacement of a hip joint with an artificial prosthesis. Of these arthroplasties, metal-on-metal type implants represent an increasing usage percentage. Metal-on-metal implants are selected largely for their low volumetric wear …
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Abriebverhalten der Harris-Galante-Pfanne in Kombination mit 28mm Keramik- und Metallköpfen
… Teststärke, die das Abriebverhalten von 28 mm CoCr- und Biolox-Köpfen vergleicht. Ziel dieser Studie war es, das in-vivo-Abriebverhalten von Keramik- und Metall-Köpfen in Verbindung mit der Harris-Galante-Pfanne zu untersuchen. Bei allen Patienten wurde ein zementfreies Pfannenimplantat nach …
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Development of high performance tribological coatings for application onto hip joint prostheses
… Coatings Ltd. was modified and deposited onto CoCr and WHMWPE substrates in order to improve the wear properties. It was identified that depositing a hard coating onto soft substrate would cause high stresses and lead to coating delamination. Consequently the polyethylene substrates were ion …
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Cellular Corrosion of CoCrMo Total Knee Implants: Understanding Underlying Mechanisms Through Retrieval Analysis and Simulated Inflammatory Conditions
… damage has been investigated in cobalt-chrome (CoCr) implants that remains poorly understood and highly controversial. Originally, it was believed that this damage type was caused by inflammatory cells directly attacking the metal surface, leading to damage of the oxide layer. However, damage …
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A Study of the Structure Of 1,1,2,2-Tetracyanocyclopropane-Methanol Adduct
… to contain two activating groups, such as -COCR or -CN. The initial intent of this research was to investigate the possibility of similar reactions with 1,1,2,2- tetracyanocyclopropanes. However, in the preparation of the cyanocyclopropanes, an unexpected product was obtained. The research …
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Development of nanostructured PVD coatings for total knee replacement joints using HIPIMS.
… CrN/NbN multilayer coatings were deposited on CoCr alloy test buttons along with other (HSS, SS and Si) substrates since our intended application is on total knee replacement joints made of CoCr alloy. The knowledge gained by investigating the TiN (Ar + N[2]) plasma and the properties of TiN …
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Entwicklung eines physiologischen Simulators für Verschleißuntersuchungen an Hüftendoprothesen
… relevante Verschleißraten bei einer UHMWPE-CoCr-Paarung produziert werden konnten. Eine Analyse des Zusammenhangs zwischen der Gelenkartikulation und der Verschleißrate bezüglich der zu simulierenden Achsenanzahl bestätigte den Stellenwert einer 3-achsigen Bewegungssimulation, um klinisch …
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Design of a Cyclic Sliding, Dynamically Loaded Wear Testing Device for the Evaluation of Total Knee Replacement Materials
… to the material interface. By incorporating a CoCr disc, an UHMWPE block, stepping motors, pneumatic components, computer control, and linear tables in an x-y configuration, the device is capable of quickly screening new and alternative materials to UHMWPE before evaluating them on a much more …
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Study of Wear Mechanisms in Braking Systems with HVOF-Coated Discs
… performed. The first one was conducted on WC-CoCr coated discs polished with different intensities in order to achieve four different average surface roughnesses: 5, 1, 0.1, 0.04 μm respectively. The results of the study highlighted that the wear of the friction material decreased by four …
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Einfluss der Präparationsform auf die Retention von Adhäsivattachments
… (0, 1, 2 oder 4) und der Dicke der CoCr-Retentionsflügel (0,4 mm und 0,8 mm). Vor der Prüfung der Retentionsfestigkeit der RBAs wurden die Proben 37.500 Temperaturwechselzyklen unterzogen, gefolgt von einer dynamischen Belastung der Patrizen der RBAs mit 1.200.000 Zyklen unter …
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Iatrogenic Electrocautery Damage and Cellular-Based Corrosion of Total Joint Arthroplasty Biomaterials
… functional deficit. Cobalt-Chromium-Molybdenum (CoCrMo) alloy is one of the most used materials in Total Joint Arthroplasty (TJA) implants due the material’s high strength, high corrosion resistance, and biocompatibility. The release of metal ions and potential occurrence of metallosis in TJA has …
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Wear of ultra-high molecular weight polyethylene manufactured with laser powder bed fusion
… implant typically comprises a cobalt chromium (CoCr) femoral component and a polyethylene tibial insert that is constrained in a tibial tray. The articulation between the femoral component and tibial insert replaces the function of the natural knee joint. Advances in design, manufacturing, and …
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Design and development of an electrospun polymeric transcatheter heart valve for tissue engineering
… of pre-cut leaflets onto the expandable stent (CoCr, 23 mm) after heat bonding an electrospun PEL skirt was selected. Four groups of valves, differing in average leaflet thickness (n = 2–4 per group), were produced for each material type. Under simulated aortic conditions, the PEL valves (N = …