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The effect of recasting on the Fatigue resistance of Co-Cr alloys

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Abstract

The present study evaluated the effect of recasting cobalt-chromium alloys with the addition of new alloy in different ratios (75% and 50%) on the deflection fatigue resistance using three types of alloys: Wironit (Bego), Remanium (Dentaurum), and Wisil (Wipla). Each alloy was divided into three groups for each test, group I (100% new alloy), group II (75% new alloy +25% recast alloy), and group III (50% new alloy + 50% recast alloy).Fatigue specimens produced were butterfly-shaped and half round at their cross section with 18mm length, 1mm thickness, and 2mm width. For each alloy group, five samples were prepared.The results of this study revealed that recasting with adding 75% new alloy did not significantly affect the fatigue resistance of Wironit and Wisil alloys, while significantly affected that of Remanium. Recasting with the addition of 50% new alloy significantly decreased the fatigue resistance of the three types of alloys.Wironit alloy showed the higher mean values for deflection fatigue resistance compared with Remanium and Wisil alloys.


Article
Effect of Temperature on The Solvent Extraction of Cobalt(II), Nickel(II), and Copper(II) Metal Ions by o-diphenylamino Benzoic Acid

Author: Matheel D. Al-Sabti
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2008 Volume: 26 Issue: 5 Pages: 496-500
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The solvent extraction of cobalt, nickel, and copper ions by the ligand odiphenylaminobenzoic acid in chloroform at 273, 293, and 318 K has beeninvestigated. The values of pH1/2 and kex as well as the values for the thermodynamicparameters ΔG, ΔH, and ΔS have been calculated.

تم دراسة الاستخلاص المذيبي لأيونات الكوبالت، النيكل، والنحاس بواسطة الليكاند أورثو ثنائي٢٩٣ ، و ٣١٨ كلفن. قيم ، فنيل أمين حامض البنزويك المذاب في الكلوروفورم بدرجات حرارة ٢٧٣تم (ΔS , ΔH , ΔG) وكذلك الدوال الثرموديناميكية kex وثابت الاستخلاص pH1/ الدالة الحامضية 2احتسابها.

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