Lubricant evaluation method for FDBs using TOF-SIMS |
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Authors: | K Matsuoka S Obata F Toujou |
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Affiliation: | (1) HD development center, Matsushita Electric Industrial Co., Ltd., 3-1-1 Yagumo-Nakamachi, Moriguchi, Osaka 570-8501, Japan E-mail: matsuoka@hdct.ctmo.mei.co.jp, JP;(2) Matsushita Technoresearch, Inc., 3-1-1 Yagumo-Nakamachi, Moriguchi, Osaka 570-8501, Japan, JP |
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Abstract: | With the increase in recording density and data transfer rate of hard disk drive (HDD), fluid dynamic bearing (FDB) motors
have been introduced due to their silence and high rotation accuracy. Although lubricant plays a major role in the development
of FDB motors, it is extremely difficult to perform thorough evaluation because the quantity of lubricant used in the motor
is as small as several micro liters. This paper describes a lubricant evaluation method for FDBs using the time of flight
secondary ion mass spectrometry (TOF-SIMS), which enables simultaneous analyses of elements and organic molecules at PPM levels
in an extremely small quantity of sample. By using this method, we found that worn metal elements generated both from spindle
and bearings have substantial influences on lubricant degradation.
Received: 5 July 2001/Accepted: 1 November 2001 |
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