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New process of developing nanocrystalline FeCr for fuel cell application

Othman, Mohd. Ashraf (2014) New process of developing nanocrystalline FeCr for fuel cell application. Other thesis, Universiti Tun Hussein Onn Malaysia.


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The objectives of this study are to explore the high energy ball milling combined with ultrasonic treatment to develop smaller crystallite size, finer surface morphology, higher thermal stability and more homogenous nanocrystalline FesoCr20 alloys. The process that combined both is not hlly investigated. They are carried out by high energy ball milling with milling time of 60 h and ultrasonic treatment using frequency of 35 kHz at various period of 3 h, 3.5 h, 4 h, 4.5 h, and 5 h. Characterization was carried out to all sample by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Energy dispersive X-ray Diffraction (EDS), Thermo Gravimetric Analysis (TGA) and Particle Size Analyzer (PSA). The result showed that the combination process (milling combined with ultrasonic techniquelnamed of milled and UB) samples effectively increased the solid solubility of Cr to Fe up to 62.1% and decreased the crystallite size to 2.71 nrn at milled and UB 4.5 h, and have finer surface structure. Composition of combination samples are at suitable composition of 20.05 wt?h Cr and 79.95 wtOh Fe compared with raw material, ultrasonic treatment (UB) samples and milled 60 h sample. Lower gradation is observed on combination sample at 1 100 OC up to 12.7 mg/ 52 Mh, 48 wt% and 25 wt% which is compared with FesoCrZoa s raw material, UB samples and milled 60 h sample, respectively. The particle size decreased up to 5.23 pm and particle size distribution of combination process relatively increased up to 89.57% compared with UB samples, and milled 60 h sample.

Item Type: Thesis (Other)
Subjects: T Technology > TN Mining engineering. Metallurgy
Depositing User: Normajihan Abd. Rahman
Date Deposited: 11 May 2015 08:41
Last Modified: 11 May 2015 08:41
URI: http://eprints.uthm.edu.my/id/eprint/6911
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