Low-volume-loss surface polishing with a krypton fluoride excimer laser for polycrystalline diamond films
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2023-07-17 |
| Journal | Applied Physics Letters |
| Authors | YÅ«ki Katamune, Koki Murasawa, Tsuyoshi Yoshitake, Toshiharu Kikuchi, Kaname Imokawa |
| Institutions | Kyushu Institute of Technology, OSG (Japan) |
| Citations | 5 |
Abstract
Section titled āAbstractāSurface polishing of hard diamond coatings is a key technique for applying such coatings in industry. In this study, we demonstrated surface modification of polycrystalline diamond films with minimal volume loss of the films by vertical irradiation of KrF excimer laser beams. Optimized laser scanning selectively removed surface asperities and reduced the surface roughness from ā¼0.1 to ā¼0.05 Ī¼m. Raman spectroscopic measurements revealed that laser polishing involves the phase transformation of diamond to amorphous carbon phases and thermal oxidation or evaporation of the amorphous phases. The residual amorphous carbon was almost completely removed by subsequent laser irradiation at appropriate fluences. We consider that the surface texture inherent to polycrystalline diamond films plays an important role in the concentration of laser beams on the nearby film surface. From reciprocating slide-type friction tests, we found that laser polishing decreased the initial friction coefficient from 0.5 to 0.1-0.3 against alumina balls and reduced the abrasion of the mating materials.