HIPIMS制备Cr-B涂层及摩擦学性能

Tribological Property of Cr-B Coatings Prepared by HIPIMS Technique

为研究Cr-B涂层在多测试环境(干摩擦、蒸馏水和海水环境)下摩擦磨损行为,采用高功率脉冲磁控溅射沉积技术制备Cr-B涂层,分析涂层成分、结构、微观形貌和力学性能,重点考察涂层在不同环境下的摩擦磨损性能。结果表明:制备的Cr-B涂层,B/Cr的原子比为1.8,结构主要由CrB2和自由Cr相组成,硬度和弹性模量分别为(26.9±1.0)GPa和(306.7±6.0)GPa。摩擦测试结果显示:涂层在干摩擦时具有较高的摩擦因数为0.75,发生严重磨损失效,归因于摩擦过程中涂层剥落而导致严重的磨粒磨损;与干摩擦相比,涂层在蒸馏水和海水环境中的摩擦因数均显著降低,分别为0.26和0.22,这主要由于蒸馏水和海水的边界润滑作用所导致,在蒸馏水中摩擦的磨损机制为磨粒磨损,而在海水中的磨损机制为磨粒磨损和腐蚀磨损的协同作用。

To investigate the tribological behavior of Cr-B coatings under different environments （dry, distilled water and sea water conditions）, the Cr-B coatings were deposited by high power impulsed magnetron sputtering technique. The composition, morphology, microstrueture and mechanical properties were analyzed, and the tribological behavior of Cr-B coatings under different environments was mainly investigated. The results show that the deposited binary Cr-B coating exhibits a preferred （101）-texture with boron deficiency （B/Cr atom ratio is about 1.8）, the hardness and elastic modulus were （26.9~1.0） GPa and （306.7＋6.0） GPa, respectively. The coating under the dry environment displays a high coefficient of friction of 0.75 and wear rate due to the wear debris in the wear track that lead to serious abrasive wear. However, under the distilled water and sea water environments, the coating shows a relatively low friction coeffi- cient of 0.26 in distilled water and 0.22 in sea water because of the formed boundary lubrication. Meanwhile, the wear mechanism under the distilled water environment is abrasive wear, while under the sea water condition, it attributes to the synergistic effect of abrasive wear and corrosion wear.