An explanation for laser-induced spallation effect in a-C:H films:Altered phase evolution route caused by hydrogen doping
文献类型：期刊论文
| 作者 | Hu TC(胡天昌) ; Wang LP(王立平); Wang LP(王立平); Hu LT(胡丽天); Ding Q(丁奇)
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| 刊名 | Journal of Applied Physics
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| 出版日期 | 2011 |
| 卷号 | 109期号:13501页码:13501(1-9) |
| ISSN号 | 0021-8979 |
| 通讯作者 | 王立平 |
| 中文摘要 | 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. |
| 学科主题 | 材料科学与物理化学 |
| 收录类别 | SCI |
| 资助信息 | the National Basic Reearch Program of China 973 Program Grant NO.011CB706603;the National Natural Science Foundation of China Grant NO.50905178 |
| 语种 | 英语 |
| 公开日期 | 2012-12-03 |
| 源URL | [http://210.77.64.217/handle/362003/2340]  |
| 专题 | 兰州化学物理研究所_固体润滑国家重点实验室 兰州化学物理研究所_先进润滑与防护材料研究发展中心 |
| 通讯作者 | Wang LP(王立平); Wang LP(王立平) |
| 推荐引用方式 GB/T 7714 | Hu TC,Wang LP,Wang LP,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 | 胡天昌,王立平,王立平,胡丽天,&丁奇.(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 | 胡天昌,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). |
入库方式： OAI收割
来源：兰州化学物理研究所
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