Manufacturing Industry
CVD diamond coated end mill resists wear, frictional heat.
Advanced Materials & Processes, October, 1999
A recent ceramic machining test reportedly compared the performance of a CVD diamond coated end mill with that of an uncoated tungsten carbide end mill and a titanium nitride coated carbide end mill. The diamond coating was DF1000 from Norton Diamond Film, Northboro, Mass., and the test compared machining results of a presintered ceramic workpiece.
According to Norton, the uncoated tungsten carbide and TiN-coated tungsten carbide tools failed within six inches of machining. Optical pyrometry of these tools indicated that cutting temperatures were over 900 [degrees] C (1650 [degrees] F). However, the CVD diamond coated tool that had already run 80 previous passes was barely warm to the touch after eight sequential passes. This difference is attributed mainly...
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