Study on Ion Beam Machining of Diamond Knives for Ultra-Microtomes

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Diamond knives pre-finished by mechanical lapping can be sharpen with Ar ion beams of 1.0 kev at the normal ion incidence. however, effects of the thin radiation damage layer of the knives on cutting performance and life of the knives have not been investigated. Therefore, crystallinity of the diamond specimens bombarded with Ar ions is examined utilizing an AFM (atomic force microscope). Moreover, the tip radius of quadrangular and triangular pyramidal diamond probes sharpened with ion beams is examined because of the difficulty of measurering the cutting edge sharpness of the diamond knives. Machining characteristics and surface integrity of the diamond specimens processed with oxgen ion beams was also investigated. From the experiments, conclusion are summarized as follows :(1) Tip radius of the quadrangular and triangular pyramidal proves can be predicted with simple equations.(2) Surface integrity of the diamond specimens processed with 1.0 keV argon and oxygen ions depends on crystal faces because of the difference of the initial surface integrity and scratched parts on the diamond specimens is machined faster than the other parts.(3) Diamond specimen can be machined faster with oxygen ion beams than with argon ion beams.