The effect of droplets in arc evaporated TiAlTaN hard coatings on the wear behavior
The effect of droplets in arc evaporated TiAlTaN hard coatings on the wear behavior
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DOI：
10.1016/j.surfcoat.2014.01.010
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发表时间：
2014-10
影响因子：
5.4
通讯作者：
M. Tkadletz;C. Mitterer;B. Sartory;I. Letofsky-Papst;C. Czettl;C. Michotte
中科院分区：
文献类型：
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作者：
M. Tkadletz;C. Mitterer;B. Sartory;I. Letofsky-Papst;C. Czettl;C. Michotte
通过阴极电弧蒸发沉积的硬涂层通常以液滴为特征，使其表面粗糙度和抗氧化性恶化。在这项工作中，研究了这些液滴对摩擦学载荷的响应及其对摩擦学系统的贡献。在室温和700℃条件下，对TiAlTaN涂层硬质合金盘进行了与al2o3相对应的球盘试验。利用扫描电镜和透射电镜对磨损轨迹的表面和横截面进行了研究。研究发现，液滴为剪切裂纹提供成核位置，并将磨料碎片释放到滑动接触中，从而有助于涂层降解，而高温氧化可使涂层更有效地嵌入周围的涂层基体。这表明氧化诱导的自修复过程有助于提高钛铝基硬质涂层在高温下的耐磨性。
Hard coatings deposited by cathodic arc evaporation are often characterized by droplets, deteriorating their surface roughness and oxidation resistance. Within this work, the response of these droplets to tribological loading and their contribution to the tribological system was investigated. Ball-on-disk tests against Al2O3counterparts were done on TiAlTaN coated cemented carbide disks at room temperature and 700 °C. Surfaces as well as cross-sections through the wear tracks were investigated by scanning and transmission electron microscopy. While droplets were found to contribute to coating degradation by providing nucleation sites for shear cracks and by the release of abrasive fragments into the sliding contact, oxidation at elevated temperature leads to a more efficient embedding into the surrounding coating matrix. This suggests an oxidation induced self-healing process, contributing to the enhanced wear resistance of TiAlN-based hard coatings at elevated temperatures.