Title
Reactive ion beam stripping process for diamond coated cutting tools reconditioning
Author
Alexey Remnev
Year
2019
Journal
Surface and Coatings Technology
Abstract
Cemented carbide cutting tool reconditioning and reuse gives a significant benefit to the subtractive manufacturing industry by saving tool manufacturing and material costs. Successful reconditioning requires wear resistant coating to be stripped off prior to the edges re-sharpening. Electro-chemical stripping of ceramic hard coatings is well established process. However it is not applicable to diamond coatings due to diamond's chemical stability. In this work we are reporting ion beam based stripping process, showing excellent results in the CVD diamond coated drills and end mills. Erosion rates were measured for micro-, nano- and ultra nanocrystalline diamond films. It was shown that suggested stripping methods provides 10 times higher erosion rate of the diamond films compared to the cemented carbide. Spatial distribution of erosion rate along the perimeter of transverse cross-section of a drill was shown to be rather uniform, with deflection ~20% of max value. Raman spectroscopy was utilized in order to facilitate a discussion on the diamond erosion mechanisms.
Instrument
NRS-5100
Keywords
Raman Imaging Spectroscopy, CVD diamond stripping, Cutting tool reconditioning, Decoating, Reactive ion beam etching