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Effect of temperature on the microstructure of hot pressed Co based Co-Cr-Mo alloy

I. SOMUNKIRAN1,* , A. BALIN2

Affiliation

  1. Department of Metallurgy of Technical Education Faculty of Firat University, Elazığ/Turkey
  2. Department of Machine of Junior Technical College of Siirt University, Siirt/Turkey

Abstract

In this study, biocompatible Co-based Co-Cr-Mo alloy powder produced by direct-resistant hot-pressing technique at different temperatures. The effect of pressing temperature on microstructure and mechanical properties of the samples produced were determined. The powder consisting of 67.5% Co (99.5% purity-325mesh), 27.5% Cr (99% purity-325mesh) and 5% Mo (purity 99.95%-325mesh) was homogeneously mixed by the adding polyethylene glycol lubricant. The powder mixtures prepared were directly hot pressed under 115 bar at 750, 800, 850, 900 ° C for 5 minutes. Density, microstructure and some mechanical characteristics of the samples produced were investigated. The density of the sintered specimens increased with the temperature, except the specimen at 850 °C in which porosity increased, due to the local microstructural segregation..

Keywords

Hot Pressing, Orthopedic Implants, Co-Cr-Mo Alloy, Powder Metallurgy.

Citation

I. SOMUNKIRAN, A. BALIN, Effect of temperature on the microstructure of hot pressed Co based Co-Cr-Mo alloy, Optoelectronics and Advanced Materials - Rapid Communications, 7, 9-10, September-October 2013, pp.702-706 (2013).

Submitted at: Oct. 1, 2012

Accepted at: Sept. 18, 2013