In this article, we report the mixed lubricant system, which consists of bonded FDTS islands and mobile perfluoropolyether lubricant. The mixed lubricant was deposited on a magnetic disk surface with carbon overcoat by immersion and dip-coating process and the durability and friction properties of the disk were evaluated by a scratch tester and ball-on-disk tribotester. The critical load of the disk coated with the mixed lubricant is higher than that of the disk coated with purely mobile PFPE lubricant even though the film thickness of the former is smaller than that of the latter. It is because that the FDTS islands allow to trap and maintain the mobile PFPE molecules on the disk surface. The friction coefficient of the disk coated with the mixed lubricant is increased with the bonded portion because the contact area is increased.
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