Si3N4一hBN陶瓷复合材料与Fe―B合金配副的摩擦学特性研究

本资料包含pdf文件1个，下载需要1积分

利用MMU-5G销一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^-5mm^3／（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 tribological behaviors of Si3N4-hBN composites sliding on Fe-B alloy without lubrication and with water lubrication were studied on a MMU-SG type pin-on-disc wear tester. The results show that the addition of hBN to Si3 N4 can not effectively improve the tribological characteristics of Si3 N4-hBN/Fe-B alloy sliding pairs. The materials and worn sur- faces as well as wear debris were characterized by means of scanning electron microscopy （ SEM ） and X-ray diffraction （XRD） , and the worn surfaces were analyzed by using X-ray diffraction spectroscopy （EDS） , laser scanning microscopy （LSM） and X-ray photoelectron spectroscopy （ XPS ）. The analysis indicates that, without lubrication, the wear of Si3 N4- hBN composites is resulted from cracking and fracture,while the hard phase Fe2 B in Fe-B alloy spall off during the wear test. This results in the abrasive wear,high friction coefficients（ 〉0. 9）and high wear coefficients（ 〉 1 x 10-5 mm3/（N ~ m））. With water lubrication, the wear debris is carried away from wear surfaces by water stream, and the abrasive wear is avoi- ded. The wear surfaces become smooth due to the chemical removal of micro-asperities on Si3 N4-hBN surface caused by successive oxidation and hydrolysis of Si3 N4 and hBN. As a result, excellent tribological characteristics of Si3 N4-hBN/Fe-B alloy pairs are obtained.