Powder metallurgical processing of Co–28%Cr–6%Mo for dental implants: Physical, mechanical and electrochemical properties

Rodrigues, Wilson Corrêa; Broilo, Luiz Roberto; Schaeffer, Lírio; Knörnschild, Gerhard Hans; Espinoza, Fidel Romel Mallqui

doi:10.1016/j.powtec.2010.09.024

Cited by 65 publications

(37 citation statements)

References 27 publications

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“…4,5) However, homogeneous ultrafine grained materials suffer from the problem of extremely low ductility. 6,7) Therefore, it is required to prepare material having high strength and excellent ductility at the same time.…”

Section: Introductionmentioning

confidence: 99%

Application of Harmonic Structure Design to Biomedical Co–Cr–Mo Alloy for Improved Mechanical Properties

et al. 2014

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Harmonic structure is a recently introduced concept for material microstructure design. It is essentially a bimodal microstructure in which deliberately introduced structural heterogeneity has a specific order: interconnected network of ultra-fine grained (UFG) regions, called "shell area", and coarse-grained regions called "core area". Such microstructural features dictate a unique set of properties to the Harmonic-structured materials. The present paper deals with the application of harmonic structure design to biomedical CoCrMo alloys for improved mechanical properties. In the present work, it has been demonstrated that full density CoCrMo alloy compacts with harmonic structure can be successfully prepared by controlled mechanical milling followed by spark plasma sintering of the pre-alloyed powders at 1323 K for 3.6 ks. Sintered compacts exhibited an excellent combination of strength and ductility. Moreover, it has been also shown that the mechanical properties depend strongly on the volume fraction of the inter-connected three-dimensional network of fine-grained regions, i.e., shell volume fraction. In addition, the plastic deformation of harmonic structure CoCrMo alloy also led to ¡-FCC to ¾-HCP allotropic transformation. Therefore, the application of harmonic structure design leads to the new generation microstructure of biomedical CoCrMo alloys, which demonstrates outstanding mechanical properties compared to conventional materials.

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Section: Introductionmentioning

confidence: 99%

Application of Harmonic Structure Design to Biomedical Co–Cr–Mo Alloy for Improved Mechanical Properties

et al. 2014

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“…Table 1 shows the selected process for sintering parameters combination. In sintering of Co-30Cr-6Mo, the targeted density is 8.28g/cm 3 . Hence the category of this ratio is nominal the best.…”

Section: Taguchi Methodsmentioning

confidence: 99%

“…Co-30Cr-6Mo is a common material used in orthodontic, hip and knee implant [1][2][3]. Particle bonding during sintering is a significant factor which increases density, hardness, strength and other engineering properties.…”

Section: Introductionmentioning

confidence: 99%

Sintering Parameter Optimization of μPIM Co-30Cr-6Mo using Taguchi -Grey Relational Analysis based on Multiple Responses

2015

International Academy of Engineers Feb. 8-9, 2015 Kuala Lumpur (Malaysia)

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Abstract-This paper employed Grey relational analysis and L9 Taguchi method to optimize the sintering process parameters based on the mechanical properties of Co-28Cr-6Mo. The input of four sintering factors: Sintering Temperature (1250°C, 1300°C and 1350°C), Heating Rate (2°C/min, 5°C/min and 10°C/min), Soaking Time (30, 45 and 60 min) and Cooling rate (2°C/min, 5°C/min and 10°C/min) has been used. In present study, Taguchi-Grey Relational approach was performed to optimize multi response characteristics based on density, strength and hardness. The result showed that sintering temperature and cooling rate was significance, where as the holding time and heating rate were less significant. Sintering temperature of 1350°C increased the packing density and tensile strength. The best combination of sintering condition was sintering temperature (1350°C), heating rate (2°C/min), cooling rate (5°C/min) and soaking time (45 min). The confirmation test has proven to gives better responses.

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“…Strengthening of alloys is obtained through combination of solid-solution hardening by the addition of carbon, chromium, molybdenum, tungsten or nickel to the pure cobalt matrix [6,7]. Biocompatibility of cobalt alloys is based on the spontaneous formation of a passivating oxide film [8,9]. In regard to the individual effects of the elements forming cobalt alloys, niobium and titanium are considered as inert.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of Co-Cr-Mo Alloy Used in Dentistry

Łukaszczyk¹,

Augustyn-Pieniążek²

2015

Archives of Metallurgy and Materials

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The presented paper studies the effect of the casting technology on the corrosion resistance of Co-Cr-Mo alloy. The investigations were conducted on a commercial alloy with the brand name ARGELOY N.P SPECIAL (Co-Cr-Mo) produced by Argen as well as the same alloy melted and cast by the lost wax casting method performed by a dental technician. The corrosion behavior of the dental alloys in an artificial saliva was studied with the use of the following electrochemical techniques: open circuit potential and voltammetry. After the electrochemical tests, studies of the surface of the examined alloys were performed by means of a scanning electron microscope with an X-ray microanalyzer. The results of the electrochemical studies show that the dependence of the corrosion resistance on the microstructure associated with the recasting process is marginal. The results of the electrochemical studies of the considered alloy clearly point to their good corrosion resistance in the discussed environment.Keywords: cobalt alloys, corrosion resistance, method of wasted wax, microstructureZbadano wpływ technologii odlewania na odporność korozyjną stopu Co-Cr-Mo. Badaniom poddano stop komercyjny o nazwie handlowej ARGELOY N.P SPECIAL (Co-Cr-Mo) firmy Argen oraz ten sam stop przetopiony i odlany przez technika dentystycznego metodą traconego wosku. Zachowanie korozyjne badanego stopu w środowisku sztucznej śliny zostało zbadane przy użyciu technik elektrochemicznych: pomiaru potencjału bezprądowego, woltamperometrii cyklicznej.Po przeprowadzeniu badań elektrochemicznych wykonano badania powierzchni badanego stopu przy pomocy elektronowego mikroskopu skaningowego z mikroanalizatorem rentgenowskim. Wyniki badań elektrochemicznych wskazują, że na odporność korozyjną oraz mikrostrukturę stopu proces powtórnego odlania wpływa jedynie w niewielkim stopniu. Wyniki badań elektrochemicznych rozpatrywanego stopu wskazują jednoznacznie na ich dobrą odporność korozyjną w rozpatrywanym środowisku.

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Powder metallurgical processing of Co–28%Cr–6%Mo for dental implants: Physical, mechanical and electrochemical properties

Cited by 65 publications

References 27 publications

Application of Harmonic Structure Design to Biomedical Co–Cr–Mo Alloy for Improved Mechanical Properties

Application of Harmonic Structure Design to Biomedical Co–Cr–Mo Alloy for Improved Mechanical Properties

Sintering Parameter Optimization of μPIM Co-30Cr-6Mo using Taguchi -Grey Relational Analysis based on Multiple Responses

Corrosion Resistance of Co-Cr-Mo Alloy Used in Dentistry

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Powder metallurgical processing of Co–28%Cr–6%Mo for dental implants: Physical, mechanical and electrochemical properties

Cited by 65 publications

References 27 publications

Application of Harmonic Structure Design to Biomedical Co&ndash;Cr&ndash;Mo Alloy for Improved Mechanical Properties

Application of Harmonic Structure Design to Biomedical Co&ndash;Cr&ndash;Mo Alloy for Improved Mechanical Properties

Sintering Parameter Optimization of μPIM Co-30Cr-6Mo using Taguchi -Grey Relational Analysis based on Multiple Responses

Corrosion Resistance of Co-Cr-Mo Alloy Used in Dentistry

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Application of Harmonic Structure Design to Biomedical Co–Cr–Mo Alloy for Improved Mechanical Properties

Application of Harmonic Structure Design to Biomedical Co–Cr–Mo Alloy for Improved Mechanical Properties