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Preparation and characterization of 6-layered functionally graded nickel-alumina (Ni-Al2O3) composites


Citation

Abdul Latiff, Muhammad Ihsan and Muhammad Nuruzzaman, Dewan and Basri, Shahnor and Ismail, Noor Mazni and Jamaludin, Siti Nur Sakinah and Kamaruzaman, F. F. (2018) Preparation and characterization of 6-layered functionally graded nickel-alumina (Ni-Al2O3) composites. In: IOP Conference Series: Materials Science and Engineering.

Abstract

The present research study deals with the preparation of 6-layered functionally graded (FG) metal-ceramic composite materials through powder metallurgy technique. Using
a cylindrical die-punch set made of steel, the nickel-alumina (Ni-Al2O3) graded composite structure was fabricated. The samples consist of four gradual inter layers of varied nickel composition (80wt.%, 60wt.%, 40wt.%, 20wt.%) sandwiched with pure Ni and Al2O3 powders
at the ends (100wt.% and 0wt.% nickel) were fabricated under 30 ton compaction load using a hydraulic press. After that, two-step sintering was carried out at sintering temperature 1200ºC and soaking time 3 hours was maintained in a tube furnace. The properties of the prepared samples were characterized by radial shrinkage, optical microscopy and hardness testing. Results showed that larger shrinkage occurred within the ceramic phase which proves that
more porosities were eliminated in the ceramic rich layers. From the microstructural analysis, it was observed that alumina particles are almost uniformly distributed in nickel matrix, so as nickel particles in the ceramic matrix of alumina-dominant layers. From interfacial analyses, it
was observed that a smooth transition in microstructure from one layer to the next confirms a good interfacial solid state bonding between metal-ceramic constituents and good compaction process. On the other hand, microhardness test results suggest that there might be increasing
percentage of porosities in the graded structure as the ceramic content rises.

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Additional Metadata

Item Type: Conference or Workshop Item (Paper)
Collection Type: Institution
Date: 2018
Journal or Publication Title: IOP Conference Series: Materials Science and Engineering
ISSN: 1757-8981
Faculty/Centre/Office: Faculty of Bioengineering and Technology
URI: http://discol.umk.edu.my/id/eprint/8828
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