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利用MMU-5G销-盘式端面磨损试验机考察Si3N4-hBN陶瓷复合材料与Fe-B合金配副分别在干摩擦和水润滑条件下的摩擦磨损性能,分别采用扫描电子显微镜(SEM)、激光扫描显微镜(LSM)、X光电子能谱(XPS)、X射线能谱(EDS)和X射线衍射(XRD)分析摩擦面及磨屑的形貌与物质组成。结果表明,hBN的加入未能有效地改善Si3N4-hBN/Fe-B合金摩擦副的摩擦学性能,干摩擦条件下,Si3N4-hBN摩擦表面微凸体与Fe-B合金中的硬质相Fe2B发生碰撞而导致脆性断裂和剥落,发生磨粒磨损,摩擦因数均高于0.9,磨损率均高于10-5mm3/(N.m)数量级;水润滑条件下,由于水流带走了磨屑,避免磨粒磨损的发生,为Si3N4-hBN摩擦表面发生化学抛光提供条件,化学抛光使销、盘试样的摩擦表面变得光滑,从而获得较为优异的摩擦学性能。
The friction and wear properties of Si3N4-hBN ceramic composites and Fe-B alloy under dry and water lubrication conditions were investigated by MMU-5G pin-plate end wear tester. SEM, Scanning microscopy (LSM), X-ray photoelectron spectroscopy (XPS), X-ray energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) were used to analyze the morphology and composition of the friction surfaces and wear debris. The results show that the addition of hBN can not effectively improve the tribological properties of Si3N4-hBN / Fe-B alloy friction pair. Under dry friction condition, the asperity of Si3N4-hBN asperity contacts the hard phase Fe2B When the collision occurred, the brittle fracture and spalling occurred, and abrasive wear occurred. The friction coefficient was higher than 0.9 and the wear rate was higher than 10-5mm3 / (Nm). Under the condition of water lubrication, The occurrence of grain wear provides the conditions for the chemical polishing of the Si3N4-hBN tribological surface. The chemical polishing makes the friction surfaces of the pins and the disk sample smooth, thereby obtaining better tribological properties.