Particle size distributions for (a) as-supplied (P96) and (b) ball-milled boron (BP96) powders.
SEM images at two magnifications for (top) wire sample prepared from as-supplied boron, and (bottom) wire sample prepared from ball-milled boron. All samples were sintered at for 30 min.
Transport critical current density for all wires as a function of external magnetic field at 4.2 K. The inset shows the field dependences of the magnetic critical current density at 5 K and 20 K with WPS800 and WBPS800.
Compared to the increment of magnetic critical current density at 5 K and transport critical current density at 4.2 K under magnetic fields of 5–8 T with WPS800 and WBPS800. The inset shows the calculated active cross-sectional area fraction represents the connectivity factor with WPS650, WPS800, WBPS650, and WBPS800.
The correlations between (a) the critical temperature and the RRR, and (b) the and the normalized resistivity .
Temperature dependence of (a) the upper critical field and (b) the irreversibility field for wires as a function of sintering temperature and ball-milling condition.
The measured resistivity values, RRR, active cross-sectional area fractions , critical temperatures , and lattice strain for wire made from ball-milled boron and from as-supplied boron under comparable sintering conditions.
Article metrics loading...
Full text loading...