Mechanical properties of hot pressed CoCrMo alloy compacts for biomedical applications

Henriques, Bruno; Bagheri, A; Gasik, Michael; Souza, Júlio C. M.; Carvalho, Ó.; Silva, Filipe; Nascimento, Rubens Maribondo do

doi:10.1016/j.matdes.2015.06.069

Cited by 35 publications

(10 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cobalt-based alloys are frequently used biomaterials with applications in the dental and cardiac fields, as well as in orthopedic implants [ 22 , 23 ], due to the considerable wear and corrosion resistance properties given by this metallic element [ 24 , 25 ]. As dental materials, they are used for crowns with porcelain fused to metal [ 26 , 27 , 28 , 29 , 30 ], in fixed and removable dental prostheses [ 31 , 32 , 33 , 34 , 35 ], orthodontic wire leads [ 36 , 37 ], oral implants [ 38 , 39 , 40 ], and are very suitable in patients whose exposure to nickel might cause an allergic reaction [ 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Comparison of the Corrosive Behavior of Nickel-Based and Cobalt-Based Dental Alloys

et al. 2021

View full text Add to dashboard Cite

Nickel-based and cobalt-based metal alloys are frequently used in dentistry. The introduction of various elements in the alloy changes its characteristics, and a thorough study of each alloy should be completed to determine its appropriate corrosion resistance and biocompatibility in contact with physiological fluids. There are scarce investigations on these widely used dental alloys in Ringer solution, and findings in this research bring new experimental data and information. The present study evaluated and compared the corrosion behavior of six NiCr- and two CoCr-based dental materials in Ringer solution, using the following techniques: potentiostatic polarization curves (chronoamperometry), microstructural analysis, and EIS (electrochemical impedance spectroscopy). The results obtained in this investigation showed that in the NiCr-based specimens Ni4, Ni5, and Ni6 the stability of the passive layer was destroyed after polarization and a development and growth of stable pits was found in the microstructural analysis after electrochemical treatment. In terms of susceptibility to corrosion, two different groups of specimens were derived from this investigation. A first group which included the two CoCr (Co1 and Co2) and three of the six NiCr alloys studied (Ni1, Ni2, and Ni3). A second group with the other NiCr alloys investigated Ni4, Ni5, and Ni6.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis and Comparison of the Corrosive Behavior of Nickel-Based and Cobalt-Based Dental Alloys

et al. 2021

View full text Add to dashboard Cite

show abstract

“…As a medical dental material, CoCr alloy has been widely used to repair defects in teeth and dentition because of its superior mechanical properties, biocompatibility and corrosion resistance (Henriques et al, 2015;Gascoyne et al, 2016;Pound, 2010;Zhang et al, 2014). Traditional methods for fabricating stomatology CoCr alloy include casting, forging and milling (Hussein et al, 2015;Kostevsek et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Selective laser melting dental CoCr alloy: microstructure, mechanical properties and corrosion resistance

Chen

Yang

et al. 2021

RPJ

View full text Add to dashboard Cite

Purpose In this paper, the mechanical properties and corrosion resistance of CoCr alloy fabricated by selective laser melting (SLM) were studied, and the changes of performance after porcelain sintering process were also analysed. This study is to point out the relationship between the microstructure, mechanical properties and corrosion resistance of CoCr alloys prepared by SLM after porcelain sintering process. In addition, the biosafety of the sintered CoCr alloy was evaluated. Design/methodology/approach The microscopic feature changes of CoCr alloy samples after porcelain sintering process were observed by DMI 5000 M inverted metallographic microscope and Nova Nano430 FE-SEM. Moreover, phase identification and determination were conducted by X-ray diffraction (XRD) using Smartlab X-ray diffractometer. The Vickers microhardness was measured on the HVS-30 microhardness tester, and tensile tests were carried out on a CM3505 electronic universal testing machine. The corrosion resistance was tested by a classical three-point electrode system electrochemical method, then the ion precipitation was measured by using an atomic absorption spectrometer of Z2000 7JQ8024. Findings The XRD results indicate that the transition of γ phase (FCC) to e phase (HCP) occurs during the porcelain sintering processing of CoCr alloy. Moreover, the Vickers microhardness of the upper surface and the side surface of the CoCr alloy sample was improved by more than 36%. In addition, the ultimate strength of CoCr alloy via porcelain sintering treatment was increase to 1,395.3 ± 53.0 MPa compared to 1,282.7 ± 10.1 MPa of unprocessed CoCr alloy. However, the corrosion resistance of CoCr alloy samples decreases after porcelain sintering process. Originality/value There are few studies on the relationship of microstructure, mechanical properties and corrosion resistance of CoCr alloys prepared by SLM after porcelain sintering process. In this study, the microstructure, mechanical properties and corrosion resistance of CoCr alloy after porcelain sintering process were studied, and the biosafety of the alloy was evaluated. The research found that it is feasible to apply CoCr alloy fabricated by SLM to dental medicine after porcelain sintering process.

show abstract

“…This study will focus on mixed‐material couples as would be typically found in a CoCrMo head seated onto a Ti‐6Al‐4V stem. This combination became popular due to the favorable wear properties of CoCrMo 26 as a bearing surface, matched with the lower modulus Ti‐6Al‐4V 27 alloy which helps minimize stress shielding as would occur according to Wolff's law 28 . In the body, fretting corrosion within a modular taper junction leads to material loss, introducing corrosion (metal cations) and wear (metal oxide) products into the local tissue.…”

Section: Introductionmentioning

confidence: 99%

The effect of hypochlorous acid on the tribocorrosion of CoCrMo/Ti‐6Al‐4V bearing couples

Kubacki

Gilbert

2021

J Biomedical Materials Res

View full text Add to dashboard Cite

Mechanically assisted corrosion (MAC) of metallic orthopedic alloys is a consequence of the use of modular devices where opposing metal surfaces are tightly mated and loaded at the taper junction. MAC processes are affected by material surface characteristics and local solution chemistry. During inflammation, active immune cells may generate reactive oxygen species (such as hypochlorous acid [HOCl]) adjacent to surfaces undergoing micromotion, which may affect the tribocorrosion behavior of an implanted device. This study investigated the fretting current response of CoCrMo/Ti‐6Al‐4 V couples in a pin‐on‐disk apparatus utilizing HOCl solutions as a proxy for a severe inflammatory environment. Testing in 1 and 5 mM HOCl solutions were shown to generate a threefold and fivefold increase (p < 0.01), respectively, in fretting currents over pH 7.4 phosphate‐buffered saline control conditions. Fretting currents were shown to be dependent on the energy dissipated during fretting and the concentration of HOCl where the currents within a single HOCl concentration were linearly dependent of energy dissipated, but different HOCl levels shifted (increased and then decreased) fretting currents with concentration. Fretting currents, governed by regrowth of an abraded oxide film, were affected by the oxidative power of the solution, which caused positive shifts in open circuit potential and likely resulted in a thicker oxide for 1 mM and 5 mM and fell with 30 mM. Small amounts of HOCl release within a joint may result in increased release of tribocorrosion products such as oxide particles.

show abstract

Mechanical properties of hot pressed CoCrMo alloy compacts for biomedical applications

Cited by 35 publications

References 27 publications

Analysis and Comparison of the Corrosive Behavior of Nickel-Based and Cobalt-Based Dental Alloys

Analysis and Comparison of the Corrosive Behavior of Nickel-Based and Cobalt-Based Dental Alloys

Selective laser melting dental CoCr alloy: microstructure, mechanical properties and corrosion resistance

The effect of hypochlorous acid on the tribocorrosion of CoCrMo/Ti‐6Al‐4V bearing couples

Contact Info

Product

Resources

About