Dispersion and Coating Perfection By Plasma Ashing
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
It is desirable to test a new dispersion for its quality before using it in the mass production of disks. By plasma ashing away the organic binder material and using scanning electron microscopy (SEM) techniques, the quality of the dispersion of the magnetic particles in the coating can be evaluated. The SEM analysis shows: a) The degree of clumping or agglomeration, i.e., how well the magnetic particles are dispersed. b) The magnetic particle alignment in the orienting magnetic field during coating. c) Major contamination with debris or defects. Furthermore, with the use of a mask and a profilometer, an accurate measurement of the coating thickness can be obtained.