Use of Deep Cryogenic Treatment to Reduce Particle Contamination Induced Problem in Hard Disk Drive

Abstract:

In this study, the effect of deep cryogenic treatment on the generation of stainless steel particles in screw tightening process in hard disc drive assembly was investigated. During the cryogenic treatment, the specimens of both stainless steel screw and contacting tool (called as “bit”) material were quenched in a chamber containing liquid nitrogen at-196 oC with the soaking times of 33 hr. The specimens were then subjected to sliding wear tests under normal loading conditions. The experiments used for simulating dry sliding wear mechanisms were carried out by TriboGear machine. The machine consists of a stationary bit loaded against the plate containing screw. The screws used were made of martensitic 410 stainless steel and the bit was made of S2 tool steel. The experiments were carried out under both under single and multiple loading cycles under the normal load corresponding to the effective stresses higher and lower than the yield strength of screw material. The results showed that the deep cryogenic treatment led to more homogeneous distribution of fine size carbide particles in both martensitic 410 stainless steel and S2 tool steel. This lead to different failure mechanism of the stainless steel resulting in smaller and slender stainless steel particles generated. This was expected due to the effect of the change in the dimension of carbide, the stress distribution in the material and the crack propagation path.

• Periodical: Key Engineering Materials (Volume 730)
• Pages: 265-271
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.730.265
• Online since: February 2017
• Authors: Somchai Laksanasittiphan*, Karuna Tuchinda, Anchalee Manonukul, Surasak Suranuntchai
• Keywords: Deep Cryogenic Treatment, Hard Disc Drive Assembly, Particle Contamination, Stainless Steel, Tool Steel, Wear

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