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Abstract
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 A degrees 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 A degrees 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 A degrees 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 A degrees C.
Original language | English |
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Pages (from-to) | 351-360 |
Number of pages | 10 |
Journal | Tribology Letters |
Volume | 43 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1 Sept 2011 |
Keywords
- Low temperature
- Carbon
- Nanotribology
- Contact mechanics
- Hardness
- Coatings
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Dive into the research topics of 'Low Temperature Nano-Tribological Study on a Functionally Graded Tribological Coating Using Nanoscratch Tests'. Together they form a unique fingerprint.Projects
- 1 Finished
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The Cryogenic Nano Mechanical and Tribological Properties of Bulk and Surface Engineered Polymeric and Metallic Materials
Dong, H. & Bell, T.
Engineering & Physical Science Research Council
1/10/05 → 31/03/10
Project: Research Councils