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In this paper, the cutting performance of tools coated with ceramic or diamond when turning sintered carbons, which have severe abrasion, is compared with that of cemented carbide, cermet, alumina ceramic and sintered diamond tool. As concerns diamond coated tool, in addition, the effects of the coating layer thickness and the substrate on wear rate are investigated. When turning carbon-phase materials, the cutting edge of coated tools wears sharply in contrast with the blunt edge of sintered tools. When turning graphite-phase materials, crater wear also occurs, but the coating layer on the rake face close to the cutting edge hardly wears. The flank wear is rapid for carbon-phase, and is slow for graphite phase. The wear rate of ceramic coated tool almost depends on the wear resistance of the substrate, in contrast that of diamond coated tool is hardly affected by the substrate material. The tool indicates very superior wear resistance as comparison with sintered one. The cutting time worn out the coating layer is approximately proportional to the thickness. Even if the layer has been stript off, a sudden increase of tool wear does not occur as long as it remains on the rake face.

Machinability of Sintered Carbons (5th Report). Cutting Performance of Tools Coated with Ceramic or Diamond.