Thesis - Oztek_Muzaffer_T_200508_MA

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For the ball milling of lanthanum nickel, vanadium titanium nickel, magnesium nickel, and lanthanum nickel aluminum alloys, a high energy Spex 8000M Mixer/Mill was used, Figure 5. Small samples were prepared using a 50-mL tungsten carbide grinding vial obtained from Spex Certi Prep Inc., Metuchen, NJ, was used with two 11.11 mm tungsten carbide balls as the high energy ball milling medium. Other samples were prepared using a 50-mL stainless steel grinding vial with 12.70 mm stainless steel balls obtained from the same company. These samples were previously prepared by other researchers in our group to be used in the U-tube and Parr reactors. In addition to the Spex 8000 Mixer Mill, a Fritsch Pulverisette 6 Planetary Mono Mill was also used for the ball milling of numerous lanthanum nickel samples for DSC analysis, Figure 5. A 250-mL stainless steel grinding vial with 9.7 mm diameter stainless steel balls obtained from Gilson Co., OH was used as the grinding medium. 24
Figure 5. The high energy Spex 8000M Mixer/Mill (left) and the Fritsch Planetary Mill (right). 2.2.1. Differential Scanning Calorimetry (DSC) Hydriding and dehydriding characteristics of sample materials were determined using a SETARAM DSC 111 differential scanning calorimeter (DSC). The DSC furnace was fitted with sample and reference cells made from 1/4” Hastelloy C-22 seamless tubing. The cells were connected to inlet and exit valves with quick disconnects for easy access. The inlet and exit valves were needle and globe valves, respectively. The inlet valves were connected to hydrogen and helium cylinders and the exit valves opened to the atmosphere. All components and fittings were made of 316 stainless steel. Pressure 25
Page 1 and 2: RECOVERY OF HYDROGEN AND HELIUM FRO
Page 3 and 4: ABSTRACT Waste streams of hydrogen
Page 5 and 6: I dedicate this work to my family m
Page 7 and 8: I also would like to cheer for my f
Page 9 and 10: 2.2.2.1. Hydriding and Dehydriding
Page 11 and 12: LIST OF FIGURES Figure 1. Pressure-
Page 13 and 14: Figure 34. Pressure profiles under
Page 15 and 16: 1. INTRODUCTION The focus of this s
Page 17 and 18: ecause of the difference in partial
Page 19 and 20: hydrides by dissolving large amount
Page 21 and 22: hydrogen storage alloy has a specif
Page 23 and 24: • Insensitivity to poisoning by i
Page 25 and 26: hydrogen capacity was not reproduci
Page 27 and 28: showed the lowest plateau pressure
Page 29 and 30: grain boundaries increases the tota
Page 31 and 32: These parameters are generally inte
Page 33 and 34: Figure 4. CaCu5-type P6/mmm structu
Page 35 and 36: In this study, the addition of Al t
Page 37: 2. EXPERIMENTAL 2.1.Chemicals and R
Page 41 and 42: 2.2.1.1. Hydriding and Dehydriding
Page 43 and 44: approximately 5 atm, and heating th
Page 45 and 46: determined by the start and end of
Page 47 and 48: 450 400 coating thickness (Å) 350
Page 49 and 50: 3. RESULTS AND DISCUSSIONS 3.1. Hyd
Page 51 and 52: DSC 111 heat flow/mW Exo 300 Figure
Page 53 and 54: The thermogram associated with the
Page 55 and 56: total time was broken into three 30
Page 57 and 58: The VTiNi sample was subjected to d
Page 59 and 60: solid solution of hydrogen rather t
Page 61 and 62: DSC 111 Heat Flow/mW 180 Exo Figure
Page 63 and 64: 100 rpm setting, the milling vial w
Page 65 and 66: BPR, 400 rpm, 5 minutes) did not re
Page 67 and 68: Table 1: Effects of various milling
Page 69 and 70: Due to the fast kinetics observed a
Page 71 and 72: The mole % Al after milling was les
Page 73 and 74: Figure 24: Percent hydrogen capacit
Page 75 and 76: the start of the heating period, wh
Page 77 and 78: However, it was noted that the part
Page 79 and 80: percent hydrogen was decreased. The
Page 81 and 82: 3.2.2.4. AuPd and Pt Coating on LaN
Page 83 and 84: 1.0 0.8 (a) (b) Wt. % H absorbed 0.
Page 85 and 86: After dehydriding by the sample, th
Page 87 and 88: 19 18 P (atm) 17 16 15 14 0.74 %Al
Page 89 and 90:
GC output, arbitrary units 0 5 10 1
Page 91 and 92:
sample was LaNi 5 . This may indica
Page 93 and 94:
30 min. 15 min. Intensity (arb. uni
Page 95 and 96:
After milling the percentages of Al
Page 97 and 98:
4. CONCLUSIONS This study has been
Page 99 and 100:
16. Van-Vucht, J.H.N., Kuijpers, F.
Page 101 and 102:
47. Suryanarayana, C., Progress in
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Thesis - Oztek_Muzaffer_T_200508_MA

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