Sensor controlled gas nitriding and nitrocarburising of ferrous materials – possibilities and limits

Spies, H. I.

doi:10.1179/174951410x12851626812853

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Low Temperature Nano-Tribological Study on a Functionally Graded Tribological Coating Using Nanoscratch Tests

et al. 2011

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Previous studies on low temperature tribological investigations were limited to macro-scale studies because of the lack of suitable instrumentation. This limitation has been overcome using a newly developed low temperature nanoscratch tester capable of characterizing the scratch resistance of coatings down to -30°C. The scratch resistance and mechanical properties of a functionally graded a-C:H(Ti)/ TiCN/TiN/Ti coating have been investigated for temperatures ranging from 25 to -30°C. It has been found that the a-C:H(Ti)/TiCN/TiN/Ti coating failed at high loads by cracking and spallation during the room-temperature scratch tests. Fractography suggests that these failures originate from or close to the interface between the top a-C:H(Ti) and the TiCN layers. Decreasing the test temperature from 25 to 0°C resulted in increased values in H, H/E r and H 3 /E r 2 , consistent with improved crack-and wear resistances, with further smaller improvements being achieved on further decreasing the temperature to -30°C.

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