抄録
Dense MgB2 layer was formed by aerosol deposition method (ADM) on metal and glass substrates at room temperature. The principle of ADM is based on shock loading solidification due to the impact of fine particles flow with the substrate, a part of kinetic energy of fine particles is converted into bonding energy between the substrate and the particles, and between the particles themselves. Hardness of the deposited layer was 700–800 Hv. The joined force was stronger than 30MPa. The density was over 95% of that of bulk material. This layer has a polycrystalline structure with nano-meter scale and has super conductive phase transition at 25–35 K. However, the conductivity has second peak at 15K. From the microstructure analysis by TEM-EDX, surface of the starting powder was oxidized. As the result, boundaries of crystal grains contain oxygen, and then this grain boundary works as conductive barriers.
