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Study on the Effect of Annealing Temperature on the Compressibility and Microscopic Structure of Pure Graphite

Abdul Razak, Mohamad Anas Najmi (2011) Study on the Effect of Annealing Temperature on the Compressibility and Microscopic Structure of Pure Graphite. Universiti Teknologi Petronas. (Unpublished)

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Abstract

The problem of improving the physical and mechanical properties of graphite is not receivin~ considerable attention despite ~phite bein~ used widely in critical and dangerous applications in many industries such as in nuclear reactors, automotive components, rocket nozzles and hi!Pt temperature heat exchangers. Studies have indicated that, if a metal powder is annealed, the compressibility of the powder will improve. Therefore, it is the purpose of this report to investigate and establish an extensive study to improve the compressibility of graphite powder, one of the many mechanical properties of graphite. The objective of this report is to study on the effect of annealing temperature of pure graphite powder on the compressibility and microscopic structure of its pellet produced by powder metallur~ process. The ~phite powder will undergo powder metallurgy processes in order to produce the pellets; ~ndin~, annealin~ and compacting. Four sets of samples comprising of 10 pellets each will be produced. I set will be left unannealed as the datum, and the other 3 set of samples will be annealed at three different annealing temperatures; 700°C, 800°C and ~00°C. The pellets will be compressed using compaction pressure between 14-140 MPa (2000psi-20000psi). Next, the density of all the pellets will be measured and compressibility curves comparing the compressibility of all set of samples will be plotted based on the densities recorded. After that, the microstructure of pellets compressed at 137.~0 MPa (20000psi) at all annealing temperature (unannealed, 700°C, 800°C and 900°C) will be analyzed using SEM and recorded. The analysis carried out to the compressibility curve of the samples shows that, the compressibility of the samples increase as the annealing temperature increases. The microstructures of the samples indicated that necking and bridging structures formed vigorously as the annealing temperature increases. As a conclusion~ the compressibility of graphite increases as its annealing temperature increases.

Item Type: Final Year Project
Academic Subject : Academic Department - Mechanical Engineering - Materials - Engineering materials - Metals alloys - Phase transformation
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 2053 not found.
Date Deposited: 09 Oct 2013 11:07
Last Modified: 25 Jan 2017 09:41
URI: http://utpedia.utp.edu.my/id/eprint/8709

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