| dc.description.abstract | Has been done smoothing process of NdFeB flakes using conventional ball mill by
dry milling method within an inert gas atmosphere using Nitrogen gas (N2) while
milling process was held. The materials used were NdFeB flakes. Milling time
which became the research parameter was varied for 8 hours, 16 hours, 24 hours
and 48 hours. Then NdFeB powder particle diameter was measured by PSA, the
crystal structure analysis by XRD, microstructure observation by SEM-EDX and
the hysteresis curve by VSM. For density test, magnetic properties (flux density)
and the BH-curve by Permagraph was done on pellet form samples. Sample in
flakes form which has been milled with milling time variety, was pressed with 7
tonf force for 2 minutes and with added adhesive celuna as much as 3 wt% up to
become pellets form with a diameter ±1.6 cm. Further the pellet samples were
given heat treatment for 1 hour at temperature 110ᵒC, 150ᵒC and 170ᵒC. Pellet
samples were then coated with sirlak. Then the pellet samples density was
measured using a caliper. Pellet samples that have been done heat treatment,
were magnetized with the impulse magnetizer in 1500V DC voltage. Pellet
samples that have been magnetized , flux density was measured using a
Gaussmeter. From the magnetic flux density sample value, the best sample that
obtained was the sample in milling time for 48 hours at heat treatment
temperature was 170ᵒC and obtained magnetic flux density at 485.8 Gauss. The
highest density at 5.74 g / cm3
and NdFeB pellet coercivity are 1.171 kOe and
BHmax 0.62 MGOe. | en_US |
