公开(公告)号：DE3578101D1

公开(公告)日：1990-07-12

申请号：DE3578101

申请日：1985-11-19

Applicant: IBM

Inventor： HAGAN JAMES ALOYSIUS ,  MALOY JAMES EDWARD ,  WILKE MYRON ANDEN WILHUR

IPC: B05C11/08 ,  B05D1/00 ,  B05D1/40 ,  G11B5/842

Abstract: A rigid magnetic disk substrate (18) is spin coated using a closely confining, stationary air barrier adjacent the surface being coated. The coating is applied through a slotted opening in the air barrier which is progressively closed as the coating is applied and completely sealed during the spin-off operation. During the application of the coating, the air barrier is positioned approximately 3,8 mm from the disk substrate surface and prior to spin-off, the barrier is moved to a position 0,6 mm from the coated surface. Further, during the high speed spin-off cycle a high kinematic viscosity gas, such as helium, is introduced into the space between the barrier and the coated surface to establish a laminar flow condition and eliminate spoking of the coated material.