Download e-book for iPad: Cobalt-Base Alloys for Biomedical Applications (ASTM Special by John A. Disegi, Richard L. Kennedy, Robert Pilliar

By John A. Disegi, Richard L. Kennedy, Robert Pilliar

ISBN-10: 0803126085

ISBN-13: 9780803126084

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Extra resources for Cobalt-Base Alloys for Biomedical Applications (ASTM Special Technical Publication, 1365)

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Cobalt-Chromium-Carbon Alloys, Experimental Procedure In essence, the alloys were deposited from electrolytes containing di-valent cobalt and tri-valent chromium ions, with voltages that alternated back and forth between that needed for depositing cobalt to that needed for depositing chromium. This results in a structure composed of amorphous Co-rich and Cr-rich layers (Fig. 2). During such a procedure, the length of time spent at each voltage determines the thickness of a layer. As deposition of each layer proceeds, carbon is known to be carried into the chromium deposits from the organic constituents of the electrolyte [3].

At early stages of treatment, precipitates cannot be detected optically or analyzed by x-ray diffraction; increased hardness indicates their presence. [5] described a method for fabricating dental prosthetic frameworks of metallic glasses, composed of preferred composition Co-20P (mass fractions of ca 88 % cobalt and 12 % phosphorus), for use in resin-retained, fixed-partial dentures. 1 kgf). Based on the method of 2 [10], yield strengths calculated from HKs {(ca 3 MPa)/HK} indicate that these alloys are exceptionally strong, having yield strengths ranging from ca 1,860 MPa to 3,300 MPa (270,000 psi to 478,000 psi).

2% yield strengths to be determined. The extensometer was then removed and the sample tested to fracture, enabling UTS and % elongation to be determined. Results and Discussion Powder Characterisation The water atomised powder consisted of roughly spherical particles, (Figure la). Sphericity was linked to powder size, the smaller particles appearing more rounded than those particles greater than 106~tm in size. Ball milling the PREP powder transformed this highly spherical powder into small flaky particles, the majority of which were < 381am in size, (Figure lb).

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Cobalt-Base Alloys for Biomedical Applications (ASTM Special Technical Publication, 1365) by John A. Disegi, Richard L. Kennedy, Robert Pilliar


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