A study of the ageing behaviour of a cobalt based implant alloy

Taylor, R N; Waterhouse, R.B.

doi:10.1007/bf00544151

Cited by 86 publications

(52 citation statements)

References 13 publications

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“…However, the fraction and morphology of Cr 2 N in our study were different from those in their results. Taylor et al 12) reported on the aging behavior of a Co-28.3Cr-5.4Mo-0.26C alloy. They showed that a lamellar structure consisting of carbides appeared in the phase during aging in the range from 973 to 1273 K depending on the aging time.…”

Section: Metal Release From Zr-added Co-29cr-6mo Alloy Compacts Durinmentioning

confidence: 99%

Microstructures of Zr-Added Co-Cr-Mo Alloy Compacts Fabricated with a Metal Injection Molding Process and Their Metal Release in 1 mass% Lactic Acid

et al. 2010

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The microstructures of Zr-added Co-29Cr-6Mo alloy compacts fabricated with a metal injection molding (MIM) process and their metal release from the compacts immersed in 1% lactic acid were investigated for medical applications. The relationship between the microstructure and amount of Co released from the compacts is discussed phenomenologically. The relative density of the Co-29Cr-6Mo compacts increased when Zr was added to the powder with amounts of 0.03 and 0.1 mass% and sintered in Ar or N 2 . The amounts of Co released from the compacts containing 0.03 and 0.1 mass% Zr sintered in Ar or N 2 were smaller than those from the other compacts. Therefore, the addition of Zr to the Co29Cr-6Mo powders enhanced the sintering of the compacts and decreased the porosity in the resultant products, leading to the suppression of the Co release from the compacts. When the Zr-added Co-29Cr-6Mo alloy powders were sintered in N 2 , the relative density of the compacts was smaller than that of those sintered in Ar. The powders were nitrided during sintering in N 2 , and the nitrides disturbed the densification during sintering. In addition, a lamellar structure was formed in the Co-29Cr-6Mo and Co-29Cr-6Mo-0.5Zr compacts. The amount of Co released from these compacts was larger than that released from the other compacts because local corrosion occurred at the interface between the different phases in these compacts during immersion in 1% lactic acid. In the MIM process, a small addition of Zr (less than 0.1 mass%) to the Co-29Cr-6Mo alloy is effective for densification during sintering and suppression of the Co release from the compacts.

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Section: Metal Release From Zr-added Co-29cr-6mo Alloy Compacts Durinmentioning

confidence: 99%

Microstructures of Zr-Added Co-Cr-Mo Alloy Compacts Fabricated with a Metal Injection Molding Process and Their Metal Release in 1 mass% Lactic Acid

et al. 2010

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“…On the basis of the literature data [6,13], it was assumed that the main carbide precipitations which occur in this kind of alloys are phases of the M 23 C 6 type carbides, distributed at the grain boundaries and in the interdendritic spacings, and they are the main reason for the material's reinforcement. Additionally, according to Taylor et al [9], in casting cobalt alloys, one can also observe primary M 7 C 3 carbides, and, according to Clemow, also M 6 C [10].…”

Section: Test Resultsmentioning

confidence: 90%

Selected Properties And Tribological Wear Alloys Co-Cr-Mo And Co-Cr-Mo-W Used In Dental Prosthetics

Augustyn-Pieniążek¹,

Kurtyka²,

Sulima³

et al. 2015

Archives of Metallurgy and Materials

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The presented work provides the results of the abrasive wear resistance tests performed on Co-Cr-Mo and Co-Cr-Mo-W alloys with the use of the Miller’s apparatus. The analyzed alloys underwent microstructure observations as well as hardness measurements, and the abraded surfaces of the examined materials were observed by means of electron scanning microscopy. The performed examinations made it possible to state that the Co-Cr alloys characterized in a high hardness, whereas the changes in the mass decrement were minimal, which proved a high abrasive wear resistance.

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“…Thermal processing has been commonly used in Co alloys to modify the potential carbide precipitation reactions. Various carbide microstructures [2] can be produced which in turn might lead to improved alloy strength. In particular, the development of stacking faults and twins during alloy heat treating seems to play a key role in the resultant carbide distribution and morphology [3].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characterization of CoCrMo Alloys Consisting of Different Palladium Ratios Produced by Investment Casting Method

2015

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CoCrMo alloys are one of the most commonly used materials for hip arthroplasty, knee and dental because of its mechanical properties, corrosion resistance, wear resistance and biocompatibility. In this study, CoCrMo alloys consisting of 1.68 to 4.33%Pd are produced by investment casting process under argon atmosphere. The microstructures and mechanical properties of CoCrMo alloy were studied using X-ray diffraction, optical microscopy, scanning electron microscopy, Knoop indentation hardness tests, focusing on the influences on the different palladium additives. The measured microhardness values of CoCrMo alloys having different palladium ratio are seen to be load-dependent. The observed load dependence was rationalized using the Hays-Kendall model and it was found that the resultant load-independent hardness decreases with increase of palladium ratios. As a results, microhardness decreases with increase of palladium amount.

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A study of the ageing behaviour of a cobalt based implant alloy

Cited by 86 publications

References 13 publications

Microstructures of Zr-Added Co-Cr-Mo Alloy Compacts Fabricated with a Metal Injection Molding Process and Their Metal Release in 1 mass% Lactic Acid

Microstructures of Zr-Added Co-Cr-Mo Alloy Compacts Fabricated with a Metal Injection Molding Process and Their Metal Release in 1 mass% Lactic Acid

Selected Properties And Tribological Wear Alloys Co-Cr-Mo And Co-Cr-Mo-W Used In Dental Prosthetics

Mechanical Characterization of CoCrMo Alloys Consisting of Different Palladium Ratios Produced by Investment Casting Method

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