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Microstructure, Hardness and Corrosion Resistance of

2021420 · This work presents the new comparative results of Co–Cr alloys, including the surface hardness, mechanical and electrochemical corrosion properties. Two types of

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: N. Zidan, M. H. AL-Saadi

Origin of the Selective Cr Oxidation in CoCr Alloy Surfaces

2010713 · CoCr alloy surfaces are known to oxidize with the formation of stable Cr2O3 protecting films. However, the inherent mechanisms initiating the selective

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: Janina Zimmermann, Janina Zimmermann, Lucio Colombi Ciacchi, Lucio Colombi Ciacchi

CoCrMo Alloy for Biomedical Applications | SpringerLink

201211 · Various CoCr alloys (Wironit, Vitallium, and Wironium) that were immersed for 2 months in solution containing 9 g l –1 NaCl in an open beaker at 37°C showed only

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: Ingrid Milošev

Effect of Ni, W and Mo on the microstructure, phases and

202048 · Friction and wear behaviors of CoCr matrix alloys depended on the hardness, microstructure, phases, alloying elements and temperature. The Ni-rich phase,

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: Gongjun Cui, Huiqiang Liu, Sai Li, Guijun Gao, Mostafa Hassani, Ziming Kou

Influence of cobalt chromium alloy surface modification

2018117 · Several metallic materials such as titanium and cobalt alloys as well as stainless steels have been used for load bearing bone reconstruction, fixation devices

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Evaluation of Surface Topography after Face Turning of

The machinability of hard-to-cut CoCr alloys manufactured by Selective Laser Melting (SLM) technology is not yet sufficiently studied. Therefore, this work focuses on evaluation of

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Surface Modification of CoCr Alloy Using Varying

20141210 · CoCr alloy is commonly used in various cardiovascular medical devices for its excellent physical and mechanical properties. However, the formation of blood

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Co-Cr Alloys as Effective Metallic Biomaterials

20161021 · Another classification of the Co-Cr alloys focuses on Ni content. The Ni content in ASTM F 75 alloy is required to be less than 0.5 mass%, and the Ni contents in

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(PDF) Investigation of CoCr Dental Alloy: Example from a

2021722 · Three groups of dental alloys were prepared by mixing 50% brand new alloy with alloy remnants from previous castings. The first group used 100% brand new

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Mechanical properties and corrosion resistance of cobalt

202011 · For biomedical purpose, two of the commonly used alloys are Ti and CoCr. This is mainly due to their high corrosion resistance and long term stability under highly-reactive in vivo conditions and excellent mechanical properties [6]. Ti and Co specifically are labelled as passive materials as they generate a thin metal oxide barrier of roughly 1 ...

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Origin of the Selective Cr Oxidation in CoCr Alloy Surfaces

2010713 · CoCr alloy surfaces are known to oxidize with the formation of stable Cr2O3 protecting films. However, the inherent mechanisms initiating the selective oxidation of one component, commonly observed in most metal alloys exposed to an oxidizing environment, are still largely unknown. Here we present a study of the early oxidation

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CoCrMo Alloy for Biomedical Applications | SpringerLink

201211 · Various CoCr alloys (Wironit, Vitallium, and Wironium) that were immersed for 2 months in solution containing 9 g l –1 NaCl in an open beaker at 37°C showed only minimal corrosion (less than 0.2 ppm) . Although the alloy was not susceptible to stress corrosion, crevice and pitting corrosion were observed. Co-based alloys become more ...

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The formation of sigma phase in the CoCrFeNi high

2021716 · Alloy ingots with nominal composition of Co 0.5 CrFeNi, CoCrFeNi, CoCr 0.5 FeNi, CoCrFe 0.5 Ni were synthesized by melting appropriate mixtures of high-purity (>99.95%) constituent elements at least 4 times in Ar at high temperature in an electric arc furnace to ensure chemical homogeneity. To study the effects of heat treatment,

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Influence of cobalt chromium alloy surface modification

2018117 · Several metallic materials such as titanium and cobalt alloys as well as stainless steels have been used for load bearing bone reconstruction, fixation devices and joint prostheses [].Among them, cobalt-chromium-based (CoCr) alloys are commonly used in orthopedic applications and have considerably improved the life quality and expectancy

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Interaction of Hyaluronic Acid with CoCr Alloy Under

2018823 · In this work, electrochemical and chemical changes induced by immersion and wear–corrosion processes of CoCr/CoCr couple in phosphate buffer solution (PBS) with 0.3% hyaluronic acid (PBS-HA) have been studied. Electrochemical characterization of CoCr surfaces in PBS-HA was performed by the measurement of the corrosion potential,

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Evaluation of Surface Topography after Face Turning of

The machinability of hard-to-cut CoCr alloys manufactured by Selective Laser Melting (SLM) technology is not yet sufficiently studied. Therefore, this work focuses on evaluation of surface texture formation during face turning of CoCr alloy. As part of the research, two specimen types were subject to comparison: made with the application of conventional

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Surface modification of CoCr alloys by electrochemical

between PAP–CoCr disks and PMMA was measured using a tensile test machine (H25K-S, Tinius Olsen Testing Machine Co., Inc Willow Grove, PA) set up at a constant speed of 10 mm min 1. The specimens were loaded in the machine as Fig. 1 (A) Potentiodynamic curve of CoCr alloy in HCl (0.5 M). The pictures show the visual appearance of CoCr 0.5 V, CoCr

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Ceramic Wear Particles: Can They Be Retrieved In Vivo And

2023324 · MOM: Cobalt Chromium (CoCr) on CoCr (ASTM F1537 alloy round bar). Testing was conducted with a square wear track profile with a 10 mm perimeter at a frequency of 1.0 Hz. Testing was run at 2 MPa on six stations of each interface, using prepared bovine fluid with a temperature of 37 ± 2 °C (Hyclone Wear Test Fluid,

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The progress on physicochemical properties and

2020316 · A high amount of Ta (> 6%) added into the alloy can make the Ta2O5 structure on the surface of MoTa alloy more compact, reducing the gap between cations, ... (1999) Surface-enhanced Raman spectroelectrochemical studies of corrosion fifilms on implant CoCr alloy in biosimulating solution. J Raman Spectrosc 30:97–103.

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Origin of the Selective Cr Oxidation in CoCr Alloy Surfaces

2010713 · CoCr alloy surfaces are known to oxidize with the formation of stable Cr2O3 protecting films. However, the inherent mechanisms initiating the selective oxidation of one component, commonly observed in most metal alloys exposed to an oxidizing environment, are still largely unknown. Here we present a study of the early oxidation

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Effect of Ni, W and Mo on the microstructure, phases and

202048 · Friction and wear behaviors of CoCr matrix alloys depended on the hardness, microstructure, phases, alloying elements and temperature. The Ni-rich phase, W-rich and Mo-rich solid solutions could sustain external load. Cr 2 WO 6, WO 3 and CoWO 4 had the hard and brittle nature. During sliding, these compounds could more easily

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[PDF]

Surface modification of CoCr alloys by electrochemical

between PAP–CoCr disks and PMMA was measured using a tensile test machine (H25K-S, Tinius Olsen Testing Machine Co., Inc Willow Grove, PA) set up at a constant speed of 10 mm min 1. The specimens were loaded in the machine as Fig. 1 (A) Potentiodynamic curve of CoCr alloy in HCl (0.5 M). The pictures show the visual appearance of CoCr 0.5 V, CoCr

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Evaluation of Surface Topography after Face Turning of

The machinability of hard-to-cut CoCr alloys manufactured by Selective Laser Melting (SLM) technology is not yet sufficiently studied. Therefore, this work focuses on evaluation of surface texture formation during face turning of CoCr alloy. As part of the research, two specimen types were subject to comparison: made with the application of conventional

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Comparative analysis of titanium coating on cobalt

20201126 · Titanium surface coating on cobalt-chromium (CoCr) alloy has characteristics desirable for an orthopedic implant as follows: strength, osteointegrative capability, and biocompatibility. Creating such a coated surface takes a challenging process and two dissimilar metals are not easily welded. In our study, we utilized additive

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[PDF]

Microstructures and Mechanical Properties of Co-Cr

2016720 · mechanical properties of Co-Cr alloys fabricated using three CAD/CAM-based processing techniques (milling, SLM, and milling/post-sintering) and to compare them to those of cast Co-Cr alloy. The brand names, manufacturing methods (group codes), manufacturers, and compositions of the four Co-Cr alloys used are summarized in Table1.

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Co-Cr Alloys as Effective Metallic Biomaterials

20161021 · Another classification of the Co-Cr alloys focuses on Ni content. The Ni content in ASTM F 75 alloy is required to be less than 0.5 mass%, and the Ni contents in ASTM F 799 and F 1537 alloys are required to be less than 1.0mass%. Other Co-Cr alloys such as ASTM F 90 (Co-20Cr-15W-10Ni), ASTM F 562 (Co-35Ni-20Cr-10Mo), and

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Ceramic Wear Particles: Can They Be Retrieved In Vivo And

2023324 · MOM: Cobalt Chromium (CoCr) on CoCr (ASTM F1537 alloy round bar). Testing was conducted with a square wear track profile with a 10 mm perimeter at a frequency of 1.0 Hz. Testing was run at 2 MPa on six stations of each interface, using prepared bovine fluid with a temperature of 37 ± 2 °C (Hyclone Wear Test Fluid,

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Introduction of ASTM CoCrMo Alloy ASTM F75 ...

2019214 · CoCrMo is typically used for: – Gas turbines – Orthopaedic implants – Dental implants. 1.4 Powder specification. The Arcam ASTM F75 CoCr alloy powder for EBM is produced by gas atomization and the chemical composition complies with the ASTM F75 ...

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Comparison of CoCr Alloy and TiN Coating in TKA

202118 · Brief Summary: In the current prospective, randomized study, two different materials of the same total knee arthroplasty (TKA) system - cobalt-chromium (CoCr) and titanium-nitride (TiN) - are going to be compared with regards to postoperative outcome. Two-hundred patients are planned to be included in the study over a 4-year period,

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Surface Modification of CoCr Alloy Using Varying

20141210 · CoCr alloy is commonly used in various cardiovascular medical devices for its excellent physical and mechanical properties. However, the formation of blood clots on the alloy surfaces is a serious concern. This research is focused on the surface modification of CoCr alloy using varying concentrations (1, 25, 50, 75, and 100 mM) of phosphoric

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cocr alloy Latest Research Papers | ScienceGate

There are many types of metals and alloys used in this application ( stainless steel, Ti and Ti alloys, CoCr, dental amalgam, etc). This review focus on CoCr alloys which have excellent corrosion resistance and mechanical properties which make them the best choice for many types of surgical implants.

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Surface modification of CoCr alloys by electrochemical

Surface modification by electrochemical reduction of diazonium. The CoCr surface modification with in situ generated diazonium cations was performed in a 0.5 M HCl solution containing PPD and NaNO 2.At first, one equivalent of NaNO 2 (2 mM) was added under stirring to the 0.5 M HCl electrolytic solution (20 ml) containing PPD (2 mM) at room

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Comparative analysis of titanium coating on cobalt

20201126 · Titanium surface coating on cobalt-chromium (CoCr) alloy has characteristics desirable for an orthopedic implant as follows: strength, osteointegrative capability, and biocompatibility. Creating such a coated surface takes a challenging process and two dissimilar metals are not easily welded. In our study, we utilized additive

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3D Printing Cobalt Chrome (CoCr) -

20221222 · 3D Printing Cobalt Chrome (CoCr) Cobalt Chrome is an alloy that was developed initially for the aerospace industry thanks to its excellent corrosion resistance and mechanical properties. It then became highly utilized in the medical industry mainly due to its biocompatibility. With high toughness, hardness, and strength-to-weight ratio, cobalt ...

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Evaluation of Surface Topography after Face Turning of

The machinability of hard-to-cut CoCr alloys manufactured by Selective Laser Melting (SLM) technology is not yet sufficiently studied. Therefore, this work focuses on evaluation of surface texture formation during face turning of CoCr alloy. As part of the research, two specimen types were subject to comparison: made with the application of conventional

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[PDF]

Surface modification of CoCr alloys by electrochemical

between PAP–CoCr disks and PMMA was measured using a tensile test machine (H25K-S, Tinius Olsen Testing Machine Co., Inc Willow Grove, PA) set up at a constant speed of 10 mm min 1. The specimens were loaded in the machine as Fig. 1 (A) Potentiodynamic curve of CoCr alloy in HCl (0.5 M). The pictures show the visual appearance of CoCr 0.5 V, CoCr

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CoCr alloys - PDF Free Download

CoCr alloys Understanding in evolution Various stimuli Variable concentrations Variable tissue reactions Low wear; pseudotumor (pseudocyst) ALTR = Adverse Local Tissue Reactions • Two distinct pathologies 1. High wear and ions; foreign body response but no pseudotumor 2. Lower wear with pseudotumor

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Material Data Sheet - SLM Solutions

2020106 · Co-Alloy CoCr28Mo6 / 2.4979 / F75[1] The properties and mechanical characteristics apply to powder that is tested and sold by SLM Solutions, and that has been processed on SLM Solutions machines using the original SLM Solutions parameters in compliance with the applicable operating instructions

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Co-Cr-Ta/Ti/Ti-Cr Perpendicular Recording Disks Prepared

--- CoCq 7Ta5 films with Ti/TiCrlO underlayers are prepared using an UHV sputtering system. These films show good magnetic and crystallographic properties for perpendicular recording media. Higher output and lower noise characteristics are obtained for recording densities over 200kFCI with a Co-Cr-Ta/Ti/Ti-Cr perpendicular disk when compared with

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