Abstract
Problem Statement: Co-Cr based alloys which is well known for its high Young's modulus, fatigue strength, wear resistance and corr osion resistance is an important metallic bio- material. However, till date there are only two typ e of Co-Cr alloy which are the castable and wrought cobalt alloy. Powder Metallurgy route for cobalt is expected to give better result of Co-Cr alloy. The purpose of this research was mainly to study the si ntering temperature effect to the shrinkage behavior of Cobalt Chromium (Co-Cr) alloy of the powder metallurgy route. Approach: Co-Cr was produced following P/M route under sintering temperature of 1000, 1100, 1200, 1300 and 1400 o C. The sintering time was fixed at 60 min. Several tes ts has been conducted to determine this effect such as the rate of shrinkage measurement, the bulk dens ity and porosity percentage measurement, compression and hardness tests and micro structural study. Result: From the study, it was found that the sintering temperature has caused the shrinkage of Co-Cr. The increasing of the sintering temperature has caused to the increasing of shrinka ge of Co-Cr. This has resulted to the reduction of the pore volume and hence increased it density. In conjunction to that, the strength and the hardness of Co-Cr was increased. Conclusion: Therefore, it is hope that it will bring new view o f powder metallurgy Co-Cr alloy as bio-material.
Highlights
Nowadays, Powder Metallurgy, (P/M) has become the most diverse manufacturing approach among the various metalworking technologies
P/M techniques were initially developed to overcome problem of the alignment of carbide in strings which occur in wrought processing (Gimenez et al, 2008)
Other advantage of Powder Metallurgy (P/M) is the ability to fabricate of the components with complex geometries (Robert-Perron et al, 2005)
Summary
Powder Metallurgy, (P/M) has become the most diverse manufacturing approach among the various metalworking technologies. Simchi et al (2006) has determined that by binding the products with different properties in various locations, or composite components using P/M process will reduce the cost and manufacturing step plus eliminate the welding process. The development of binding and lubrication process and the application of warm compaction lubrication have resulting a better green product. The higher sintering temperature will effecting to more shrinkage and leads to the increasing of density. This is because sintering reduces the total pore surface and pore volume of the green part (Cristofolini et al, 2010). This study was done to determine the sintering temperature effect on P/M Co-Cr alloy upon the shrinkage behavior
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