09:00 〜 09:45
▲ [15a-2J-1] [Invited lecture of overseas researcher] Development of MgB2 composites by spark plasma sintering as a superconductor and as a novel material for biomedical applications
キーワード：superconductor,biomaterial,MgB2
Samples of MgB2 superconductor with different additives were prepared by ex-situ spark plasma sintering (SPS). The following additives classified into 4 groups were tested:
(1)- approximately inert such as c-BN, h-BN and graphene,
(2)- reactive with formation of MyBz such as RE2O3, RE = La, Eu, Ho,
(3)- reactive with formation of MguMv such as Sb, Bi, Te and their oxides, and
(4)- additives which are source of carbon substituting for boron in the crystal lattice of MgB2 such as fullerene (F), F + c-BN, SiC, B4C, SiC + Te and Ge2H10C6O7.
The bulk density of our MgB2 samples is above 90%. Some additives such as c-BN, Te, or Ge2H10C6O7, significantly increase the critical current density Jc and the irreversibility field Hirr, while suppression of Jc at low magnetic fields is minimized.
Recently, we have proposed MgB2 composites added with RE2O3 as a new material for biomedical applications. We paid attention to biodegradation and corrosion aspects as well as to in-vitro biocompatibitity and antibacterial activity against Escherichia coli, and Staphylococcus aureus. Our results suggest that MgB2-based materials deserve attention for implants or sterile medical instruments.
(1)- approximately inert such as c-BN, h-BN and graphene,
(2)- reactive with formation of MyBz such as RE2O3, RE = La, Eu, Ho,
(3)- reactive with formation of MguMv such as Sb, Bi, Te and their oxides, and
(4)- additives which are source of carbon substituting for boron in the crystal lattice of MgB2 such as fullerene (F), F + c-BN, SiC, B4C, SiC + Te and Ge2H10C6O7.
The bulk density of our MgB2 samples is above 90%. Some additives such as c-BN, Te, or Ge2H10C6O7, significantly increase the critical current density Jc and the irreversibility field Hirr, while suppression of Jc at low magnetic fields is minimized.
Recently, we have proposed MgB2 composites added with RE2O3 as a new material for biomedical applications. We paid attention to biodegradation and corrosion aspects as well as to in-vitro biocompatibitity and antibacterial activity against Escherichia coli, and Staphylococcus aureus. Our results suggest that MgB2-based materials deserve attention for implants or sterile medical instruments.