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Elimination of Serial/Deposited End Contamination During Flex Side Lapping Disclosure Number: IPCOM000010259D
Original Publication Date: 2002-Nov-13
Included in the Prior Art Database: 2002-Nov-13
Document File: 2 page(s) / 184K

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Elimination of Serial/Deposited End Contamination During Flex Side Lapping

In order to eliminate the corrosion of the head materials that are susceptible in the aqueous media, such as CoFeN, the aqueous slurry for lapping the flex side of the rows/bars had to be replaced with a non aqueous slurry. The slurry substitute was chosen to be 100% ethylene glycol containing 1 to 2 micron diamonds. As a result of this change, slurry/lapping contamination was observed on the serial and deposited sides of the sliders to various degrees. The manual and automated brush cleaning steps following the flex side lapping were not adequate in removing the contaminants from hard to reach places such as the serial and deposited ends. The residual slurry contamination creates several problems such as not being able to read the serial numbers and being a source of particulate contamination in the hard drive/file.

The addition of a non ionic detergent to the lapping slurry, in adequate concentration, has shown to eliminate this problem. The detergent coats the exposed surfaces during lapping, thus prevents the slurry contaminants getting attached. The non ionic detergent used in this study was Alfonic, with concentration of 0.4% by volume. It should be mentioned that there are other additives that could eliminate the contamination, but most being ionic, they increase the conductivity of the slurry which results in corrosion. Below are two images of the serial ends, where the flex side o...