Wiper Characterization for Final Lapping Process
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Abstract
The objective of the research is to study deterioration, chemical degradation and filtration efficiency of wipers in the lapping process. This research investigates deterioration on surface of wipers, made of chamois and Polyvinyl Alcohol (PVA) contracted with the lap plate, taken at 4 and 8 hours by Scanning Electron Microscope (SEM). The results indicate that PVA wiper has more evidence of deterioration than chamois wiper as determined at 4 and 8 hours. Through morphology analysis concerning degradation of wipers soaked in lubricants in the lapping process at 4 and 8 hours, the application of chamois reveals no sign of deterioration, compared to the polyvinyl alcohol counterpart with less holes on wiper membranes. ZnO particles from lapping process are used to indicate filtration efficiency of both wipers. ZnO particles measured from both wipers are detected by Atomic Absorption Spectrophotometer (AAS). Filtration efficiency ratings from chamois and polyvinyl alcohol wipers are 67% and 58% respectively, as determined at 4 hours. Particle filtration efficiency of the chamois wiper is found to be better than the one made of polyvinyl alcohol as determined at 4 hours. At 8 hours, filtration efficiencies of the wipers made of chamois and polyvinyl alcohol can be detected at 61% and 65% respectively.
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References
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