超音速火焰喷涂金属陶瓷复合涂层的耐磨性能研究

Study on wear resistance of HVOF metal ceramic composite coating

摘要:

为改善深部钻具关键易损构件的耐磨性能，采用超音速火焰喷涂(HVOF)技术在35CrMo钢基体上制备了WC-10Co4Cr涂层，利用扫描电子显微镜(SEM)、X射线能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度仪、维氏硬度计和摩擦磨损试验机测试分析了涂层的微观结构、力学性能和摩擦磨损行为。结果表明：利用HVOF技术制备的WC-10Co4Cr涂层具有致密的微观结构和优异的力学性能，其孔隙率为1.3±0.1%，显微硬度为1392±45 HV0.3，断裂韧性为7.11±0.10 MPa·m1/2；与35CrMo钢基体相比，涂层具有更加优异的耐磨损性能，并且随着滑动速度的增加，WC-10Co4Cr涂层的摩擦系数下降、磨损率增大；WC-10Co4Cr涂层的磨损失效机制主要包括磨粒磨损、粘着磨损和疲劳磨损。

Abstract:

In order to improve wear resistance of the key wearable parts of deep drilling tools, high velocity oxygen fuel spray (HVOF) technology was used to prepare WC-10Co4Cr coating on 35CrMo steel substrate. The scanning electron microscope (SEM), X-ray energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), micro-hardness tester, Vickers hardness tester and friction and wear tester were used to analyze the microstructure, mechanical properties and friction and wear behavior of the coating. The results showed that the WC-10Co4Cr coating prepared by HVOF technology had a dense microstructure and excellent mechanical properties. The porosity of the coating was 1.3±0.1%, with the microhardness of 1392 ± 45 HV0.3, and the fracture toughness of 7.11 ± 0.10 MPa·m1/2. Compared with 35CrMo steel substrate, the coating has more excellent wear resistance, and with the increase of sliding speed, the friction coefficient of WC-10Co4Cr coating decreases and the wear rate increases; The wear failure mechanism of coating mainly includes abrasive wear, adhesive wear and fatigue wear.