氮化钛/氧化钛复相陶瓷涂层的干滑动摩擦磨损性能

Dry Sliding Wear and Friction Performance of TiN / TiO Composite Ceramic Coating

目的研究等离子喷涂Ti N/Ti O复相陶瓷涂层的微观组织结构、显微硬度及干滑动摩擦磨损行为和机理。方法采用等离子喷涂技术,在45#钢表面制备Ti N/Ti O复相陶瓷涂层。分析涂层的相组成,测试涂层的硬度。通过磨损试验研究Ti N/Ti O复相陶瓷涂层的磨损行为,并观察涂层的磨损形貌,测试磨损表面的成分组成,探讨Ti N/Ti O复相陶瓷涂层的磨损机理。结果 Ti N/Ti O复相陶瓷涂层均匀致密,平均厚度为350μm,具有明显的层状结构,孔隙率为4.3%,显微硬度为1444HV0.1。在载荷30～50 N、转速370～1102 r/min的范围内,Ti N/Ti O复相涂层与GCr15对磨的摩擦系数为0.0963～0.2778,磨损量为1.32～6.8 mg。随着载荷的增加,摩擦系数下降;随着载荷和转速的增加,磨损量增加。结论等离子喷涂制备的Ti N/Ti O复相涂层组织致密,显微硬度高,在低速低载荷时表现出较好的耐磨性,但随着载荷和转速的增加,耐磨性降低。涂层的磨损机制主要为磨粒磨损和粘着磨损。

Objective To study the microstructure,microhardness as well as dry sliding wear and friction behavior and mechanism of plasma sprayed Ti N / Ti O composite ceramic coating under different conditions. Methods Ti N / Ti O ceramic coating was prepared on 45#steel by reactive plasma spraying technology. Phase composition of the coating was analyzed using X-ray diffraction（ XRD） and the microhardness was measured by a hardness tester. The wear and friction behavior of Ti N/Ti O composite ceramic coating was studied through wear and friction tests,the wear and friction morphology was observed,the composition of the wear surface was tested,and the wear mechanism of Ti N / Ti O composite ceramic coating was discussed. Results The coating was even and dense with obvious layered structure and an average thickness of 350 μm. The porosity of the coating was 4. 3% and the hardness was 1444HV0. 1. Under the conditions of rotational speed at 370 to 1102 r / min and load at 30 to 50 N,the friction coefficient ranged from 0. 0963 to 0. 2778 and the wear mass loss was from 1. 32 to 6. 8 mg. Besides,the friction coefficient decreased with increasing load while the wear mass loss of the coated samples had an increasing trend with the increasing load and rotational speed.Conclusion The coating prepared by plasma spraying was dense with high microhardness. When the load and rotational speed were low,it had excellent wear resistance. However,the wear resistance decreased with increasing load and rotational speed. The main wear mechanisms of the coating were abrasive wear and adhesive wear.