Li Haitao, Liu Chong, Sun Pengfei, Zhang Jingping
School of Chemical Equipment, Shenyang University of Technology, Liaoyang, 111003, Liaoning, China.
Guangdong Cemt Co., Ltd, Foshan, 528200, Guangdong Province, China.
Heliyon. 2024 Oct 4;10(20):e38864. doi: 10.1016/j.heliyon.2024.e38864. eCollection 2024 Oct 30.
Diamond-like carbon (DLC) films exhibiting high adhesion and exceptional wear resistance were successfully applied onto the AZ31 surface without a adhesive layer. The structural features of the film were examined utilizing Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), and Raman spectroscopy. Mechanical properties were evaluated through Nano-indentation testing, while adhesion was evaluated using a scratch tester. Residual stress was determined by Stoney's equation. The results indicate that utilizing a high substrate bias ranging from -500 to -800 V, results in the presence of multiple craters and dislocations, which contribute to the enhancement of high residual compressive stress and hardness in the DLC film. The heightened compressive stress effectively embeds carbon atoms into the surface of the soft AZ31, creating an interfacial layer that significantly improves adhesion and wear resistance of the film. In contrast, at moderate bias levels with a range from -300 to -500 V, an increase in substrate temperature leads to the expansion and discontinuation of adjacent layers that decreases the mechanical properties, adhesion, and wear resistance of the film. When at low bias levels between 0 and -300 V, the hardness, crack resistance, residual stress, and wear resistance all increase with increasing of bias. Additionally, in this work, the mechanisms of adhesion and wear for the biased film are analyzed.
具有高附着力和出色耐磨性的类金刚石碳（DLC）薄膜在没有粘附层的情况下成功应用于AZ31表面。利用扫描电子显微镜（SEM）、透射电子显微镜（TEM）和拉曼光谱对薄膜的结构特征进行了研究。通过纳米压痕测试评估机械性能，同时使用划痕测试仪评估附着力。残余应力由斯托尼方程确定。结果表明，利用-500至-800 V的高基板偏压会导致出现多个坑洼和位错，这有助于提高DLC薄膜中的高残余压应力和硬度。增加的压应力有效地将碳原子嵌入软质AZ31的表面，形成一个界面层，显著提高了薄膜的附着力和耐磨性。相比之下，在-300至-500 V的中等偏压水平下，基板温度的升高会导致相邻层的膨胀和间断，从而降低薄膜的机械性能、附着力和耐磨性。当偏压处于0至-300 V的低水平时，硬度、抗裂性、残余应力和耐磨性均随偏压的增加而增加。此外，在这项工作中，还分析了偏压薄膜的附着力和磨损机制。
