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An initial feasibility study is conducted through subscale testing in order to assess several sensing techniques for their ability to detect corrosion damage and lubrication failure in propulsion ball bearings. Conventional vibroacoustic methods are compared and a thermography technique is examined in brief. Initial results indicate that for small, distributed corrosion pitting damage, PZT acoustic...
Ever decreasing magnetic spacing in the hard disk drive requires each contribution to the magnetic spacing to be examined for possible reduction. Currently, the lubricant layer on top of the disk carbon overcoat is typically 10-20 Å thick. This paper studies the contact resistance of nonlubricated disks with the aim of seeking a way to reduce the lubricant thickness contribution to the magnetic spacing...
Metal cutting fluids change the performance of machining operations because of their cooling, and chip flushing functions. Minimization of cutting fluid leads to economical benefits by way of saving recycling of cutting fluid, corrosion and erosion of machining components and chemical reaction of cutting fluids with work, cutter and the environment. The present work focuses on the study of the effect...
It is estimated by some that 6–7% of the US GDP each year is lost due to lubrication and wear related failure. While engineering and materials technology continues to evolve in a well-understood way, lubricant technology has itself evolved but in far less understood terms. Lubricant technology has been developed allowing for better performance in today's extremely demanding applications, and with...
On hard disk surfaces, lubricant layer not only contributes for triological requirement, but also inhibits the generation of corrosion. Corrosion resistance is a key factor in the novel lubricant development. This paper studies the corrosion products on disk surfaces with different lubricant. The relationship between the lubricant molecular structure/properties and the corrosion product composition/distribution...
We describe a new type of corrosion product that can form on the media surface during exposure to elevated temperature and humidity. An experimental carbon overcoated Co alloy media on glass substrates that exhibited high corrosion was exposed to elevated temperature and humidity at 65 degC/100% RH (non-condensing) for 48 hrs (RH/T exposure). Light scattering site density in sites per unit area was...
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