The doping of amorphous carbon is one way of specifically modifying its properties. The present work is a contribution to understand the effect of dopant selection on structure, mechanical properties and crack resistance of hydrogen-free tetrahedral amorphous carbon (ta-C) coatings. For this purpose, nonmetallic (B, Si) and metallic (Mo, Fe, Cu) dopants were selected. The coatings were produced by the Laser-Arc technique and investigated by Raman spectroscopy, transmission electron microscopy, nanoindentation, bending, and scratch tests. It was found that doping generally affected the sp² content and cluster size of the sp² carbon phase, and thus hardness, Young's modulus, and intrinsic compressive stresses, but also the defect content and the crack resistance. The addition of metallic dopants led to an increase and clustering of the sp²-bonded carbon and, consequently, to a significant reduction in hardness and Young's modulus. This effect was much less pronounced when doping with non-metallic elements. The failure behavior changed toward higher ductility and crack resistance when metals were added. The crack resistance was found to be directly dependent on the H³/E² value, with H³/E² > 0.2 leading to a more brittle behavior with unstable crack propagation, while at H³/E² < 0.2 the material was more ductile and exhibited stable crack propagation and thus higher crack resistance.

无定形碳的掺杂是一种专门改变其性质的方法。目前的工作有助于了解掺杂剂选择对无氢四面体无定形碳 (ta-C) 涂层的结构、机械性能和抗裂性的影响。为此，选择了非金属（B、Si）和金属（Mo、Fe、Cu）掺杂剂。涂层通过激光电弧技术生产，并通过拉曼光谱、透射电子显微镜、纳米压痕、弯曲和划痕测试进行研究。发现掺杂一般会影响sp ^{2的含量和sp 2}的簇大小碳相，因此硬度、杨氏模量和固有压缩应力，还有缺陷含量和抗裂性。金属掺杂剂的添加导致sp ²键合碳的增加和聚集，因此导致硬度和杨氏模量显着降低。当掺杂非金属元素时，这种效果就不太明显了。当添加金属时，失效行为向更高的延展性和抗裂性转变。发现抗裂性直接取决于H ³ /E ²值，H ³ /E ² > 0.2 导致裂纹扩展不稳定的脆性行为，而在H ³/E ² < 0.2 材料更具延展性并表现出稳定的裂纹扩展，因此具有更高的抗裂性。