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Effect of Lubricant Type and Amount on Compound and Magnet Properties

Test Conditions:
– MQEP-B+-20056-077
– 1.55 wt% epoxy
– Flowability was measured through 2.5mm orifice as per ISO 4490 Standard
– 25ml of powder was used to test for apparent density as per ISO 3923/1 Standard
– 25g of powder was used to test tap density as per ISO 3953:1993 Standard
– Magnetic properties were measured on D9.8*H6.45mm, PC=2 cylinder magnets pressed to 6.0g/cm3

Density was measured on ring magnets
D33.7 X ID30.7 XH25.4mm pressed at 10.0 t/cm2

Higher lubricant amount helps to improve magnet density.
In general, higher lubricant amount reduces the crush strength
Higher stearate type lubricant also helps to reduce the ejection pressure
No difference was observed between Li2St and ZnSt

Crush strength was measured on ring magnets
OD20.8 X ID18.6 X H5mm pressed at 6.0 g/cm3
Ejection pressure was measured on cylinder magnets
OD6 X H10mm pressed at 6.0 t/cm2