Vol 20, No. 8;Aug 2013 348 office@multidisciplinarywulfenia.org Sintering kinetic of Co-Cr-Mo alloy produced by powder metallurgy technique Shamsul Baharin Jamaludin (Corresponding author) Zuraidawani Che Daut, Fazlul Bari Sustainable Engineering Cluster, School of Materials Enineering Universiti Malaysia Perlis, Kompleks Pusat Pengajian 2 Taman Muhibbah, 02600 Arau Perlis, Malaysia Tel: 0-06-049798154 E-mail: sbaharin@unimap.edu.my The research is financed by: Malaysian Government through Malaysian Science Fund (Grant No. 9005-00008) Abstract Co-Cr-Mo (F-75) alloy is one of the most important metallic biomaterial used for surgical implant due to its strength, corrosion resistance and biocompatibility. The aim of this research is to study the sintering kinetics and the activation energy of Co-Cr-Mo alloys. The samples of Co-Cr-Mo alloy were fabricated by powder metallurgy (PM) technique. Sintering kinetic was studied during isothermal sintering from 1523 K (1250 °C) to 1623 K (1350°C) in argon atmosphere with different sintering times. The microstructure of the samples was studied by optical and scanning electron microscopy. The average grain size of the samples was measured by the line intercept method. The grain growth exponent (n) has been determined to study the mechanism of sintering and the activation energy has been calculated. The results showed that the exponent n values increase when the temperature decreases. The n values are in the range between 2 and 3 and the grain growth was driven by lattice diffusion. The value of activation energy was found to be 286 kJ/mole. Keywords: text text text text text text 1. Introduction Biomaterials are defined as materials of natural or man-made origin that used to direct, supplement, or replace the functions of living tissues of the human body (Park and Lakes, 1992). For more than a generation, biomaterials are used in medicine and dentistry with a purpose to replace or repair a body feature, tissue, organ or function. Metallic materials continue to play an essential role as biomaterials to assist with the repair and replacement parts of the human body that has become diseased or damaged. The main metallic biomaterials are stainless steels, titanium and its alloys, and Co-based alloys. Each