Wear Analysis of Head-Disk Interface During Contact

[+] Author and Article Information
Wei Peng, James Kiely, Yiao-Tee Hsia

Mechanical Integration, Seagate Technology, 1251 Waterfront Place, Pittsburgh, PA 15222-4215

J. Tribol 127(1), 171-179 (Feb 07, 2005) (9 pages) doi:10.1115/1.1843832 History: Received April 01, 2004; Revised May 26, 2004; Online February 07, 2005
Copyright © 2005 by ASME
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Schematics of (a) a two-dimensional model of interference between the head and disk, and (b) a slider with rectangular trailing edge in contact with a nominally flat rough disk
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Schematics of (a) contact and wear mechanisms between of a smooth slider and a nominally flat rough disk, (b) clean cut wear, and (c) mopping wear
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Probability density functions of surface asperity heights for virgin and worn disk
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Flowchart of the coupled head and disk wear
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Variation of head–disk interference height with time during HDI wear. kAb=1e-4,kp/r=1,v=2.5e7 μm/s,H=20 GPa,μ=0.25,a=5e2 μm,b=1e3 μm,c=2e3 μm,L=5e2 μm,ϕ0=1.7e-2,Kp=2e5 N/μm,Kz=0.5 N/μm,Kpf=4.5 e4 N/μm.
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Variation of slider wear volume and associated plastic contact ratio with time. kAb=1e-6,kAd=1e-8,σ=1 nm,β*=0.5 μm,v=2.5e7 μm/s,H=20 GPa,E*=110 GPa,Fc=1e-4N.
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Average head wear rate as a function of cumulative media wear time
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Topographical sections from the trailing edges of a series of heads flown on the same media track
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Height distribution of AFM data from worn and unworn areas of the disk surface
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Measurements of head wear volume as a function of test duration
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Optical image of a portion of the air bearing surface used in the study
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Variation of HDI wear volume with time for (a) single track wear, (b) multiple track wear, and (c) an equivalent single track wear
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Variation of slider wear volume and wear rate with time predicted by the CHAD wear model and various empirical running-in models: (a) Deterioration model and (b) running-in model




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