机械球磨法制备TiC/Al复合涂层的显微组织及力学性能

采用高能球磨机,室温下在2024铝合金表面制得TiC/Al复合涂层。利用SEM,XRD、显微硬度测试和摩擦磨损测试等技术分析涂层的显微形貌、组织结构及力学性能并初步探讨涂层的形成机理。结果表明,在350r/min转速下球磨3h后,2024铝合金表面形成界面结合良好且平均厚度为20μm的TiC/Al复合涂层。涂层最大显微硬度值高达314HV0.1,是基体硬度值的2倍多。界面处的显微硬度呈现梯度变化,对合金层起到很好的缓冲和支撑作用。摩擦磨损测试表明,涂层有效地降低原有材料的摩擦因数,使其耐磨性得到一定程度的提高。

Microstructure and mechanical properties of TiC/Al composite coating fabricated by high energy ball milling technique

TiC/Al composite coating was obtained on 2024 aluminum alloy substrate using high energy ball milling technique. Scanning electron microscope (SEM), X-ray diffractometer (XRD), micro-hardness test technique and friction and wear test technique were used to investigate the microstructure and mechanical properties of the coating, the formation mechanism of coating was also elucidated. Results show that a well combined and thick coating (about 20 μm in average) has formed. The maximum hardness of the coating is up to 314HV0.1, which is more than two times compared to that of the substrate. Micro-hardness of the interface decreases stepwise, which does buffering effect to the coating. With the effect of the coating, the friction coefficient of the sample decreases compared with the substrate, and tribological property increases to a certain extent.