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6CCVD Research

Evaluation of Thermal Degradation of DLC Film Using a Novel Raman Spectroscopy Technique

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2018-04-16
JournalCoatings
AuthorsMuyang He, Chang-Dong Yeo
InstitutionsTexas Tech University, Guizhou University
Citations22

Abstract

Section titled ā€œAbstractā€

Diamond-like carbon (DLC) films are extensively used in various industries due to their superior protective and lubrication properties. However, DLC films including sp2 and sp3 carbon bonding are metastable materials, which can be thermally degraded (or graphitized) at elevated temperature. In this study, a novel Raman spectroscopy technique was developed to evaluate the in-situ thermal stability of DLC films. When a laser beam is applied onto a DLC film, the surface temperature can increase depending on the laser power, laser duration time, and surface reflectivity. Based on this laser heating concept, the Raman spectrum data of DLC films (i.e., G peak position and width) were obtained at the controlled Raman laser power, which enabled to determine the critical temperature to initiate the thermal degradation of DLC films. Two different designs of DLC film (i.e., types A and B with different initial sp2-to-sp3 ratio) were prepared and their thermal stability was evaluated using the proposed Raman spectroscopy technique. From the systematic data analysis and comparison, it could be observed that the type-A DLC film showed the significant change of Raman parameters (i.e., G peak position and width) at lower laser power value (=lower temperature) than the type-B DLC film, which indicated that the type-B DLC film had better thermal stability.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2006 - Super low friction of DLC applied to engine cam follower lubricated with ester-containing oil [Crossref]
  2. 2004 - Cutting performance of DLC coated tools in dry machining aluminum alloys [Crossref]
  3. 2007 - DLC solid lubricant coatings on ball bearings for space applications [Crossref]
  4. 2008 - Potential of wear resistant coatings on Ti-6Al-4V for artificial hip joint bearing surfaces [Crossref]
  5. 2002 - Diamond-like amorphous carbon [Crossref]
  6. 1999 - Diamond-like carbon: state of the art [Crossref]
  7. 1999 - The structural and electron field emission characteristics of pulsed laser deposited diamond-like carbon films with thermal treatment [Crossref]
  8. 1994 - Hydrogen-free amorphous carbon preparation and properties [Crossref]
  9. 1997 - Influence of environmental parameters on the frictional behavior of DLC coatings [Crossref]

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