METHOD TO PREVENT SIOX FORMATION AT HEAD-DISK INTERFACES
Original Publication Date: 1999-Dec-01
Included in the Prior Art Database: 2003-Jun-19
Issues relating to contamination are important concerns to disk drive designers. The principal effects of contamination are known to influence at least three parameters of importance to drive operation. First, the presence of contamination may lead to an increase in stiction, especially when the contamination is able to form as liquid droplets on sliders. A second factor is related to degradation in interface durability where the intrinsic properties of the interface are altered. A likely scenario is the formation of a "third body" through breakdown of the contaminant through frictional heat. A third possibility is the formation of deposits on the slider through either isolated head-disk contacts or by the condensation of contaminant vapors on the slider during steady state operation of the drive. A common source of contamination in disk drives is through the components that make up the drives. While much effort is expended in assuring cleanliness of parts that go into the drive, the critical levels of contaminants that are necessary to cause degradation of performance are low. There have been cases where the outgassing of silicone O-ring seals produced a white debris on the rails of crashed sliders which was identified to be methylsiloxane. Sources of methylsiloxane are from the pressure sensitive adhesive tapes widely used in the manufacturing of disk drives, actuator greases, and the motor oil. A straight forward procedure is proposed to prevent the formation of SiOx during drive operation by alteration of the disk lubricant. The disk lubricant is either doped with a certain amount of dopant during disk processing or the lubricant molecule is modified synthetically through chemical reaction.