Study of the properties of Mg-MgB₂ composites.

• Other Authors: Hon, Wan Man.
• Format: Others
• Language: English; Chinese
• Published: 2006
• Subjects: Magnesium compounds; Magnesium diboride; Superconducting composites
• Online Access: http://library.cuhk.edu.hk/record=b5893004; http://repository.lib.cuhk.edu.hk/en/item/cuhk-325771

by Hon Wan Man = 鎂和硼化鎂複合材料的研究 / 韓韻文. === Thesis (M.Phil.)--Chinese University of Hong Kong, 2006. === Includes bibliographical references. === Text in English; abstracts in English and Chinese. === by Hon Wan Man = Mei he peng hua mei fu he cai liao de yan jiu / Han Yunwen. === Abstract --- p.i === 摘要 --- p.iii === Acknowledgements --- p.v === Table of contents --- p.vi === List of tables --- p.x === List of figures --- p.xi === Chapter Chapter 1 --- Introduction --- p.1-1 === Chapter 1.1. --- Background --- p.1-1 === Chapter 1.1.1. --- Conventional and unconventional superconducting materials --- p.1-1 === Chapter 1.1.2. --- Type I and type II superconductors --- p.1-2 === Chapter 1.1.3. --- Critical Temperature and Magnetic Properties (M-H Loops) --- p.1-4 === Chapter 1.2. --- Magnesium Diboride MgB2 --- p.1-6 === Chapter 1.2.1. --- Introduction --- p.1-6 === Chapter 1.2.2. --- Potential application and recent work of MgB2 --- p.1-6 === Chapter 1.2.2.1. --- Thin films --- p.1-7 === Chapter 1.2.2.2. --- Wires and tapes --- p.1-8 === Chapter 1.2.2.3. --- Powders and single crystal --- p.1-8 === Chapter 1.2.3. --- Factors affecting critical temperature in MgB2 --- p.1-9 === Chapter 1.2.3.1. --- Critical temperature versus lattice constants --- p.1-9 === Chapter 1.2.3.2. --- Critical temperature versus pressure --- p.1-9 === Chapter 1.3. --- Mg-based metal matrix composites (Mg-MMCs) --- p.1-10 === Chapter 1.4. --- Objectives and approaches --- p.1-11 === Chapter 1.5. --- Thesis layout --- p.1-12 === Chapter 1.6. --- References --- p.1-13 === Figures --- p.1-16 === Tables --- p.1-20 === Chapter Chapter 2 --- Methodology and instrumentation --- p.2-1 === Chapter 2.1. --- Introduction --- p.2-1 === Chapter 2.2. --- Experimental procedures --- p.2-1 === Chapter 2.3. --- Samples fabrication --- p.2-2 === Chapter 2.3.1. --- Powder metallurgy method (P/M) --- p.2-2 === Chapter 2.3.2. --- Argon atmosphere tube furnace heat treatment --- p.2-3 === Chapter 2.4. --- Characterization --- p.2-3 === Chapter 2.4.1. --- Differential thermal analyzer (DTA) --- p.2-3 === Chapter 2.4.2. --- X-ray powder diffractometry (XRD) --- p.2-4 === Chapter 2.4.3. --- Hot mounting and polishing --- p.2-4 === Chapter 2.4.4. --- Scanning electron microscopy (SEM) --- p.2-5 === Chapter 2.4.5. --- Transmission electron microscopy (TEM) --- p.2-5 === Chapter 2.4.6. --- Vibrating sample magnetometer (VSM) --- p.2-6 === Chapter 2.5. --- References --- p.2-8 === Figures --- p.2-9 === Chapter Chapter 3 --- Effects of sintering temperature on Mg-MgB2 composites --- p.3-1 === Chapter 3.1. --- Introduction --- p.3-1 === Chapter 3.2. --- Experimental results --- p.3-1 === Chapter 3.2.1. --- DTA and XRD analyses --- p.3-1 === Chapter 3.2.2. --- Microstructures --- p.3-2 === Chapter 3.2.2.1. --- Green sample --- p.3-2 === Chapter 3.2.2.2. --- Sample sintered at 550°C --- p.3-3 === Chapter 3.2.2.3. --- Sample sintered at 600°C --- p.3-4 === Chapter 3.2.2.4. --- Sample sintered at 700°C --- p.3-4 === Chapter 3.2.2.5. --- Hexagonal platelets --- p.3-5 === Chapter 3.2.3. --- Superconducting behaviors --- p.3-5 === Chapter 3.2.3.1. --- Critical temperature (Tc) comparison --- p.3-5 === Chapter 3.2.3.2. --- Magnetization loops (M-H loops) --- p.3-6 === Chapter 3.3. --- Discussions --- p.3-7 === Chapter 3.4. --- Conclusions --- p.3-9 === Chapter 3.5. --- References --- p.3-10 === Figures --- p.3-11 === Tables --- p.3-20 === Chapter Chapter 4 --- Effects of composition on Mg-MgB2 composites --- p.4-1 === Chapter 4.1. --- Introduction --- p.4-1 === Chapter 4.2. --- Experimental results --- p.4-1 === Chapter 4.2.1. --- XRD results --- p.4-1 === Chapter 4.2.2. --- Microstructures --- p.4-2 === Chapter 4.2.2.1 --- Mg-0 wt % B (Pure Mg) sintered at 650。C --- p.4-2 === Chapter 4.2.2.2 --- Mg-47 wt % B sintered at 650°C --- p.4-2 === Chapter 4.2.2.3 --- Amount of B in Mg sample --- p.4-3 === Chapter 4.2.2.3.1. --- Overview of Mg-5 to 40 wt % B --- p.4-3 === Chapter 4.2.2.3.2. --- MgB2 phase in different composition (Mg-5 to 47 wt %B) --- p.4-4 === Chapter 4.2.2.3.3. --- MgO phase in different composition (Mg-0 to 30 wt % B) --- p.4-4 === Chapter 4.2.3. --- VSM results (Critical temperature Tc comparison) --- p.4-5 === Chapter 4.3. --- Discussions --- p.4-6 === Chapter 4.4. --- Conclusions --- p.4-8 === Chapter 4.5. --- References --- p.4-10 === Figures --- p.4-11 === Table --- p.4-18 === Chapter Chapter 5 --- Growth Mechanisms --- p.5-1 === Chapter 5.1. --- Introduction --- p.5-1 === Chapter 5.2. --- Brief summary of SEM result --- p.5-1 === Chapter 5.3. --- Growth Mechanism of MgB2 --- p.5-2 === Chapter 5.4. --- Comparison of MgB2 grain size by XRD result --- p.5-7 === Chapter 5.5. --- Stoichiometric Ratio of MgB2 in different temperature --- p.5-7 === Chapter 5.6. --- Growth of the MgB2 platelets --- p.5-8 === Chapter 5.7. --- Conclusions --- p.5-10 === Chapter 5.8. --- References --- p.5-11 === Figures --- p.5-12 === Table --- p.5-15 === Chapter Chapter 6 --- Conclusions and Future Works --- p.6-1 === Chapter 6.1. --- Conclusions --- p.6-1 === Chapter 6.2. --- Future works --- p.6-2 === Chapter 6.3. --- References --- p.6-4