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

International Conference on Innovative Technology, Engineering and Sciences 2018

工业技术;自然科学

Latiff, M.I.A.^1 ; Nuruzzaman, D.M.^1 ; Basri, S.^2 ; Ismail, N.M.^1 ; Jamaludin, S.N.S.^3 ; Kamaruzaman, F.F.^1

Faculty of Manufacturing Engineering, University Malaysia Pahang, Pekan, Pahang Darul Makmur

26600, Malaysia^1

Office of the Assistant Vice Chancellor (Development), University Malaysia Kelantan, Kota Bharu, Kelantan Darul Naim

16100, Malaysia^2

Faculty of Engineering, DRB-HICOM University of Automotive Malaysia, Pekan, Pahang Darul Makmur

26607, Malaysia^3

关键词: Functionally graded;    Interfacial analysis;    Metal-ceramic composites;    Microhardness tests;    Microstructural analysis;    Powder metallurgy techniques;    Sintering temperatures;    Solid state bonding;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/342/1/012063/pdf
DOI  :  10.1088/1757-899X/342/1/012063

来源: IOP

【 摘 要 】

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 Al2O3powders 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 1200C 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.