• Journal of Inorganic Materials
  • Vol. 34, Issue 8, 873 (2019)
Yang GUO1、2, Wei ZHANG2、*, Xing ZHOU2、*, and Lei DENG2
Author Affiliations
  • 1PLA Academy of Military Science, Beijing 100091, China
  • 2College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
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    DOI: 10.15541/jim20180428 Cite this Article
    Yang GUO, Wei ZHANG, Xing ZHOU, Lei DENG. Oxidation Characteristics of Magnesium Diboride[J]. Journal of Inorganic Materials, 2019, 34(8): 873 Copy Citation Text show less
    TG and DTA curves of MgB2 oxidation in air flow
    1. TG and DTA curves of MgB2 oxidation in air flow
    SEM images of MgB2 oxidation residues
    2. SEM images of MgB2 oxidation residues
    XRD patterns of MgB2 oxidation residues
    3. XRD patterns of MgB2 oxidation residues
    B2O3-MgO binary phase diagram[23]
    4. B2O3-MgO binary phase diagram[23]
    Cross-sectional SEM image of oxide layer structure of MgB2 pellet after being heated up to 1665 K
    5. Cross-sectional SEM image of oxide layer structure of MgB2 pellet after being heated up to 1665 K
    Linear EDS mapping of MgB2 pellet across the oxide layer
    6. Linear EDS mapping of MgB2 pellet across the oxide layer
    XRD pattern of the internal porous oxide layer
    7. XRD pattern of the internal porous oxide layer
    Schematic diagram of evolution of MgB2 oxidation reaction
    8. Schematic diagram of evolution of MgB2 oxidation reaction
    TG and DTA curves of amorphous boron oxidation under ultra-high temperature[24]
    9. TG and DTA curves of amorphous boron oxidation under ultra-high temperature[24]
    SampleTheoretical combustion heat/(J·g-1)Experimental combustion heat/(J·g-1)Combustion efficiency/%
    B-58826-22465±11438
    MgB2-38781-23943±78862
    Table 1. Combustion heats and combustion efficiencies of amorphous boron and MgB2
    Temperature
    /K
    ${{n}_{\text{MgO}}}/{{n}_{{{\text{B}}_{\text{2}}}\text{O}}}_{_{\text{3}}}$Fraction of
    unoxidized Mg/mol%
    Fraction of unoxidized boron/mol%${{n}_{\text{B}}}/{{n}_{\text{Mg}}}$
    11651.14 : 181.1183.382.06 : 1
    13003.04 : 122.7374.626.56 : 1
    14051.52 : 16.3538.3512.08 : 1
    15201.26 : 12.1422.3020.89 : 1
    Table 2.

    Chemical analytical results of MgB2 oxidation residues

    PositionB/mol%O/mol%Mg/mol%
    Internal11.7851.2237.00
    External56.4343.57
    Table 3. EDS results of the internal and external oxide layer of MgB2 pellet
    Yang GUO, Wei ZHANG, Xing ZHOU, Lei DENG. Oxidation Characteristics of Magnesium Diboride[J]. Journal of Inorganic Materials, 2019, 34(8): 873
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