2004 Fiscal Year Final Research Report Summary
Development of super-tribological duplex coatings due to 3-dimensional femtosecond-laser processing
| Project/Area Number |
14350392
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Material processing/treatments
|
|---|
| Research Institution | Fukui National College of Technology |
|---|
Principal Investigator |
YASUMARU Naoki Fukui National College of Technology, Mechanical Engineering, Professor, 機械工学科, 教授 (90158006)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
MIYAZAKI Kenzo Kyoto University, Institute of Advanced Energy, Professor, エネルギー理工学研究所, 教授 (50293957)
KATO Hirotaka Fukui National College of Technology, Mechanical Engineering, Assistant Professor, 機械工学科, 助教授 (30311020)
|
|---|
| Project Period (FY) |
2002 – 2004
|
| Keywords | femtosecond laser / ablation / ceramic thin film / DLC / solid lubricant coating / duplex thin film / tribology |
|---|
| Research Abstract |
(1) Femtosecond-laser-induced nanostructure formed on hard thin films of TiN and DLC
Tribological hard coatings of TiN and DLC were irradiated by 800- and 267-nm, femtosecond (fs) laser pulses in air at an energy fluence slightly above the ablation threshold. On the ablated thin-film surfaces, the linearly-polarized fs pulses produce arrays of fine periodic structures that are almost oriented to the direction perpendicular to the laser polarization, while the circularly-polarized light forms fine dot structures. The size of these surface structures is 1/10 〜 1/5 of the laser wavelength and decreases with a decrease in the laser wavelength. Furthermore, the size of these structures increased with an increase in the fluence. The results suggest that the surface morphology can be controlled precisely with the fs-laser polarization and wavelength and fluence.
(2) Development of DLC-MoS_2 duplex thin films and the influence of micro grooves against the tribological property
Micro-sized grooves were mechanically created in the center of the sliding path of a ball-on-disk friction testing machine on a DLC coating and then deposited with a solid lubricant film of MoS_2 with a thickness of about 3 μm utilizing a sputtering method. The friction coefficient was lowered from 0.16 to 0.09 due to the micro-grooves against the bearing steel ball. These results suggest that the micro-grooves act as MoS_2 lubricant reservoirs. The fs-laser processing should be applied to create the more fine micro-grooves.
(3) The influence of femtosecond-laser-induced nanostructure against the tribological property
We developed the technique to create a nanostructured area (10mm X 10mm) on a DLC film utilizing the fs-laser pulses. It was found that the nanostructured DLC surface showed the improved tribological properties against the bearing steel ball.
|
Research Products
(11 results)
