Kupczyk Maciej Jan, Józwik Jerzy
Institute of Mechanical Technology, Poznan University of Technology, 60-965 Poznan, Poland.
Faculty of Mechanical Engineering, Lublin University of Technology, 20-618 Lublin, Poland.
Materials (Basel). 2022 Jun 6;15(11):4022. doi: 10.3390/ma15114022.
This study proposes a novel use of laser heating to increase the adhesion between coatings fabricated by low-temperature PVD and replaceable cemented carbide cutting inserts, thus extending the life of these cutting tools in the machining of difficult-to-machine materials. Our previous studies conducted on CVD coatings showed that these coatings had higher adhesion due to a much higher process temperature. However, taking into account the fact that PVD coatings have better technological properties (e.g., lower structure porosity, higher hardness, and better tribological properties) than CVD coatings, it is fully justified to investigate ways of improving the PVD coating adhesion to the substrate. In this study, replaceable cutting inserts with different hard coatings of titanium nitride were used. Laser heating was conducted with different power densities. The adhesion strength of the tested coatings was determined via vibration spectrum analysis. In addition, 2D surface imaging, scanning electron microscopy, and X-ray fluorescence spectrometry were employed to examine the coatings after laser heating. A significant increase in the adhesion of single-layer (TiN) and double-layer (TiCN + TiN) coatings to the cemented carbide substrate, together with increased tool life, was observed after heating the samples with 40% of the maximum laser power. The application of a multilayer coating containing thermal shock-sensitive (TiAlSi) N did not increase the tool life. This paper attempts to interpret the obtained results.
本研究提出了一种激光加热的新用途，以提高低温物理气相沉积（PVD）制备的涂层与可更换硬质合金切削刀片之间的附着力，从而延长这些切削刀具在加工难加工材料时的使用寿命。我们之前对化学气相沉积（CVD）涂层进行的研究表明，由于工艺温度高得多，这些涂层具有更高的附着力。然而，考虑到PVD涂层比CVD涂层具有更好的工艺性能（例如，更低的结构孔隙率、更高的硬度和更好的摩擦学性能），研究提高PVD涂层与基体附着力的方法是完全合理的。在本研究中，使用了带有不同氮化钛硬质涂层的可更换切削刀片。采用不同的功率密度进行激光加热。通过振动光谱分析确定测试涂层的附着力强度。此外，在激光加热后，采用二维表面成像、扫描电子显微镜和X射线荧光光谱法对涂层进行检测。在用40%的最大激光功率加热样品后，观察到单层（TiN）和双层（TiCN + TiN）涂层与硬质合金基体之间的附着力显著增加，刀具寿命也有所提高。含有热震敏感（TiAlSi）N的多层涂层的应用并没有提高刀具寿命。本文试图对所得结果进行解释。
