The shrinkage rate
on vertical direction is about 13.5%
2.In case that the granular material is pruchased from our company,the
particle should be dry ground to 3-5¦Ìm at first,and then be
wet ground in a sand grinding mill or ball mill to less than 1 ¦Ìm
,and then be wet pressed.If the coarse ground powder is bought,it can be
wet ground directly.
1).Before grinding,the grinding mill should be cleaned thoroughly.And any
materials from other factories or Impurity should not be mixed into our
material.
2).Aloong with the powder (granular powder,and coarse ground powder),we
provide the secondary additives in separated bags,users should only add it
into powder during grinding according to the requirement.
3.All the necessary secondary additives have been added into the fine
powders(<1¦Ìm).So there is no need to add any other
material,But two to three hours'wet grinding is necessary for better
distribution of particles.
4.During pressing,the moisture of slurry should be controlled between 32%
to 37%,the pressure required is >4000N/cm2,and the magnetic field
density is >560kA/m.
5.Due to the actual sintering temperature measured by various suppliers'
instruments are not the same,we can only provide sintering temperature of
1220OC-1270OC for reference.Please note that the proper sintering
temperature should be defined in accordance with the status of the
sintered sample pill.
Alnico
Powder
Characteristic
Properties of Alnico alloy powder (minimum value) |
