| An explanation for laser-induced spallation effect in a-C:H films:Altered phase evolution route caused by hydrogen doping | |
| Department | 固体润滑国家重点实验室 ; 先进润滑与防护材料研究发展中心 |
Ding Q(丁奇) ; Wang LP(王立平); Hu LT(胡丽天); Hu TC(胡天昌); Wang YF(王云峰); Zhang YN(张耀南)
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| 2011 | |
| Source Publication | Journal of Applied Physics
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| ISSN | 0021-8979 |
| Volume | 109Issue:13501Pages:13501(1-9) |
| Abstract | The laser-induced spalling effect has been recognized as a unique phenomenon for amorphous carbon a-C films during laser processing. In this work, the origin of spalling effect was investigated by ablating two different types of a-C filmhydrogenated a-C a-C:H and nonhydrogenated a-C with an Nd-yttrium aluminum garnet laser system. Comparisons of ablating results demonstrated that the spalling effect only occurred in a-C:H rather than nonhydrogenated a-C. Laser heating simulation indicated that the temperature distributions in both films after laser pulse are similar with a high temperature gradient in depth direction. Annealing test results, Raman spectra and nanoindentation show that with the increase in annealing temperature, a-C film transforms into grassy carbon directly, while a-C:H experiences two subprocess under heatingthe hydrogen mobilization and rearrangement of CuC network at a relatively low temperature range resulting in a denser CuC network and raised film density; the graphitization at high temperature which would lower the film density. We propose that the reason of laser-induced spalling effect in a-C:H might depend on two aspects1 the heat source like laser pulse which could produce a high temperature gradient in depth direction within ultrashort time and 2 the unique evolution process of film microstructure under heating. Based on above model, the spalling effect is ascribed to the concentrated stress caused by different structure evolution subprocess at different depth in a-C:H during the laser irradiation. It is remarkable that the conclusions deduced from our model are proven to be in good agreement with our experimental results and the previous articles reported by others. |
| Subject Area | 材料科学与物理化学 |
| Funding Organization | the National Basic Reearch Program of China 973 Program Grant NO.011CB706603;the National Natural Science Foundation of China Grant NO.50905178 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 低维材料摩擦学组 ; 特种油脂和密封材料组 |
| Document Type | 期刊论文 |
| Identifier | http://ir.licp.cn/handle/362003/2340 |
| Collection | 固体润滑国家重点实验室（LSL） 中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心 |
| Corresponding Author | Wang LP(王立平) |
| Recommended Citation GB/T 7714 | Ding Q,Wang LP,Hu LT,et al. An explanation for laser-induced spallation effect in a-C:H films:Altered phase evolution route caused by hydrogen doping[J]. Journal of Applied Physics,2011,109(13501):13501(1-9). |
| APA | 丁奇,王立平,胡丽天,胡天昌,王云峰,&张耀南.(2011).An explanation for laser-induced spallation effect in a-C:H films:Altered phase evolution route caused by hydrogen doping.Journal of Applied Physics,109(13501),13501(1-9). |
| MLA | 丁奇,et al."An explanation for laser-induced spallation effect in a-C:H films:Altered phase evolution route caused by hydrogen doping".Journal of Applied Physics 109.13501(2011):13501(1-9). |
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