Degradation behaviour of TiN and TiCN coatings after laser ablation
Degradation behaviour of TiN and TiCN coatings after laser ablation
复制标题
DOI：
10.1179/1743294413y.0000000218
复制
发表时间：
2014-02
影响因子：
2.8
通讯作者：
Hyun‐Gyoo Shin;S. Jeon;Y. Choi;J. Song;Heesoo Lee
中科院分区：
文献类型：
--
作者：
Hyun‐Gyoo Shin;S. Jeon;Y. Choi;J. Song;Heesoo Lee
研究了脉冲激光热冲击后在Inconel 617基体上沉积的氮化钛（TiN）和氮化碳钛（TiCN）涂层的形貌和原子浓度谱，比较了它们的劣化行为。采用电弧放电技术制备涂层厚度为2.0 μm的样品，并采用Nd:YAG脉冲激光烧蚀系统进行激光脉冲烧蚀。激光烧蚀后，TiN涂层表面出现裂纹和气孔，涂层剥落，裂纹扩展较大，而TiCN涂层表面降解较小。随着激光脉冲的增大，两种试样的涂层厚度均减小，TiN涂层中均出现界面裂纹和分层现象。深度剖面分析表明基体原子在热应力作用下扩散到表面，三维粗糙度测量表明TiCN比TiN具有更高的耐热性。
Titanium nitride (TiN) and titanium carbon nitride (TiCN) coatings deposited on Inconel 617 substrates after pulsed laser thermal shock were investigated in terms of morphological observations and atomic concentration profiling in order to compare their deterioration behaviour. The specimens were prepared by an arc discharge technique with a coating thickness of 2·0 μm and ablated with increasing laser pulses using an Nd:YAG pulsed laser ablation system. Surface cracks and pores appeared on the TiN coating subjected to laser ablation, and spalling of the coating layer occurred with large crack propagation, whereas the TiCN coating showed less surface degradation. The coating thickness for both specimens decreased as the laser pulses increased, and interface cracks with delamination formed in the TiN coating. Depth profiling indicated that atoms of the substrate diffused to the surface by thermal stress, and three-dimensional mapping for roughness measurement identified higher thermomechanical stress resistance of the TiCN than the TiN.