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topic 9479

Extreme high temperature, low frictional coefficient coating


I have been searching for a coating that has a very low coefficient of friction to eliminate scratches when a soft metal rubs on the surface. The surface preparation is ground polished and the challenge here is the working temperature which is a constant 450 to 500 deg C. I have tried TiN and CrN but they are not satisfying as they have a coefficient of 0.6 & 0.7. DLC or DLN failed too as they starts to lose weight at 400 deg C.

Would appreciate if anyone can help.

Chin Hiang, Tan
- Singapore


Most of the big coating companies in Europe have developed coatings for dry machining. I would suspect that these coatings would hold up under your conditions. I think there are at least two or three variations, including Ti-containing molybdenum disulfide, Cr-containing DLC, and a WC/C composite.

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Jim Treglio
PVD Consultant - San Diego, California

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