Permalloy is treated by heat, its magnetic characteristics are
(greatly) improved. The principal purpose of “annealing” is to
soften a metal for homogenizing it, or making its machining or
plastic working easier. But, as to Permalloy, the main purpose
of annealing is to improve its magnetic characteristics and eliminate/decrease
a residual stress after processing (such as press working, welding,
bending, cutting work, etc.).
|Heat treatment is conducted in a furnace
heated to a high temperature and filled with hydrogen gas.
Hydrogen atmosphere furnace
point = 45 degrees Celsius
|Hydrogen gas pressure
||Outside air (its pressure
is to be raised a little)
||1,050 ~ 1,100 degrees
||2 hours ~