Optimization of Infiltration and Reaction Process for the Production of Strong MgB $_{2}$ Bulk Magnets
2017
An infiltration and reaction (IR) process can realize a dense MgB
2
bulk under an ambient pressure, which is preferable for the industrial mass production in cost. However, the trapped field of the IR-processed bulk is commonly rather smaller than that of the high-pressure synthesized bulk, which is caused by the cracks and the thread-like channels of residual Mg preventing the circular supercurrent flow. To obtain the high-quality IR-processed MgB
2
bulk, we investigated the optimization of heat-treatment condition for the IR-process (sintering temperature, T
ht
= 700-900 °C and holding time, t
h
= 1-9 h). A volume fraction of the MgB
2
phase increased monotonically with increasing Tht and/or th, and the grain-size increased with increasing T
ht
. As a result, the highest critical current density J
c
and irreversibility field μ
0
H
irr
were achieved for the sample sintered at 700 °C for 9 h. The relation between the superconducting properties and the microscopic structure was also discussed.
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