期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2015
卷号：4
期号：1
页码：18629
DOI：10.15680/IJIRSET.2015.0401037
出版社：S&S Publications
摘要：Powder Metallurgy (PM) deals with products and processes which use raw material in the form of powdersthat are compacted into the required shape and size using suitable moulds. These compacted powders are called „GreenCompacts‟. The properties of the component produced by PM processes are influenced by powder characteristics suchas composition, morphology, particle size, distribution, and method of compaction. The first step in PM process ispreparation of „green‟ compacts. Uni-axial pressing is one of the most widely used compaction method for thepreparation of green compacts. The process is characterized by three distinct phases namely re-arrangement of powderparticles, inter-particle sliding and plastic deformation of powder particles.In this paper the effect of metal powder composition, particle morphology on „green‟ density under uni-axial pressingis presented. Iron powders with average particle size in the range of 2 to 150 microns show a linear relationshipbetween green density and pressure. Green densities greater than 75% can be achieved with a pressure of 500 MPa.Micron size aluminum, nickel, titanium cobalt and iron powders were compacted under 200 MPa pressure to evaluatethe effect of composition. Aluminum had the highest green density of 90%, followed by nickel at 75%, titanium at 65%and iron, cobalt at 55%. The three distinct phases of powder densification, mentioned earlier, were clearly observed inthe porosity versus pressure plots for all the powders.
关键词：Powder metallurgy; Green density; Green Compacts; Powder Morphology; Composition; Uni-axial;Pressing; Porosity.
