Development of laser dimpling strategies on TiN coatings for tribological applications with a highly energetic Q-switched fibre laser
Development of laser dimpling strategies on TiN coatings for tribological applications with a highly energetic Q-switched fibre laser
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DOI：
10.1016/j.optlastec.2013.05.007
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发表时间：
2013-12-30
影响因子：
5
通讯作者：
Lecis, Nora
中科院分区：
文献类型：
--
作者：
Demir, Ali Goekhan;Previtali, Barbara;Lecis, Nora
薄陶瓷表面涂层的激光微细加工和结构处理是一种很有吸引力的工艺，特别是在摩擦学方面的应用。研究表明，凹陷表面涂层的耐磨性和摩擦性能都有所提高。材料的性质和涂层完整性的精细性带来了严格的加工条件的问题，特别是在烧蚀深度方面。然而，对于工业规模的应用，需要工业级激光系统的加工策略。为此，本工作报告了一种高能Q开关光纤激光器用于激光压痕TiN涂层，该涂层的厚度非常有限。实验证明，采用倾斜脉冲串和控制激光散焦的加工策略可以有效地控制凹坑的半径和深度，而不会过度加工造成基板污染。凹陷的特征是由于涂层材料与基材的污染而造成的损害量。结果证实，在无污染的条件下，TiN涂层的化学成分也保持不变。(C)2013爱思唯尔有限公司。保留所有权利。
Laser micromachining and structuring of thin ceramic surface coatings is an appealing process, especially for tribological applications. Studies show increased wear resistance and friction properties of dimpled surface coatings. The nature of the material and the delicacy of the coating integrity raise the problem of tight processing conditions, especially in terms of the ablated depth. However, for the industrial scale of the application, processing strategies with industrial grade laser systems are required. For this purpose, the present work reports the use of a highly energetic Q-switched fibre laser for the laser dimpling of TiN coatings applied in very limited micrometric thickness. The processing strategy that involves ramped pulse trains and controlled defocusing of the laser beam was demonstrated to be effective for controlling the dimple radius and depth without excessive machining to cause substrate contamination. The dimples were characterised for the amount of damage done by contaminating the coating material with the substrate. Results confirm that in non-contaminated conditions chemical composition of the TiN coating was also maintained. (C) 2013 Elsevier Ltd. All rights reserved.