Synthesis of FeTiAl Intermetallic Alloy as Hydrogen Storage by Mechanical Alloying

• Main Author: Damitutsa Kurnia Dewa, Martinus
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/41141
• Institution: Institut Teknologi Bandung

Hydrogen as an energy source is a promising solution for future energy problem. However, the usage of hydrogen as an energy carrier still has a problem which is its storage. Until now, no hydrogen storage has a satisfying performance in both capacity and thermodynamics properties. FeTi intermetallic alloy is a promising hydrogen storage because it can be hydrided in ambient temperature but the hydrogen absorption capacity is still very low compared with other hydrogen storage (1-1.9 wt.%). Further research needs to be conducted in order to improve absorption capacity of FeTi alloy. The objective of this research is to study the influence of aluminum addition to the hydrogen absorption capacity of FeTi alloy. The base materials used in this research were Fe, Ti, and Al elemental powder with atomic compositions 10:10:1 and 10:10:2. Alloying was accomplished by mechanical alloying technique using High Energy Ball Milling. The duration of milling was 30 hours. The hydriding process was completed for 10:10:1 sample composition using low pressured Sievert Type Apparatus in ambient temperature (27°C) preceded by annealing process in 430°C for 2 hours. The hydrogen absorption capacity measured was 3.25wt.%. The result was invalid due to the uncalibrated hydriding system. Compared with previous research by Suwarno (2011), XRD quantitative analysis in this research showed that the additions of aluminum increased the percentage of reversible FeTiH compound to 55.35% and decreases the formation of TiH2 that is very stable and difficult to decompose. SEM images showed the hydrided particle size expanded and the agglomeration decreased because of the influence of hydrogen absorption. DTA characterization was completed to understand the hydrogen desorption mechanism. Endothermic peaks appeared when the sample was heated to 100°C which was strong evidence the existence of the hydrogen desorption phenomena.