TA15合金表面Ni-SiC复合镀层的摩擦磨损性能

采用共沉积法在TA15合金表面制备了Ni-SiC复合镀层, 分析了Ni-SiC复合镀层对基体合金硬度和磨擦磨损性能的影响, 并对其摩擦磨损机制进行了讨论。结果表明: 所制备的Ni-SiC复合镀层组织致密且与基体结合紧密, 硬度明显高于TA15合金基体。摩擦磨损实验结果表明, Ni-SiC复合镀层能为TA15合金提供良好的摩擦磨损抗力, 在相同的摩擦条件下, Ni-SiC复合镀层的磨损率明显低于TA15合金。TA15合金与GCr15球和Al₂O₃球对磨的磨损机制均主要为犁削磨损、粘着磨损, 同时伴随有氧化磨损和轻微的磨粒磨损; Ni-SiC复合镀层与GCr15磨球对磨的磨损机制主要为镀层组织的拔出及GCr15钢球在其表面上的涂抹, 与Al₂O₃磨球对磨时的磨损机制主要为疲劳磨损和削层磨损。

Friction and Wear Behavior of Ni-SiC Composite Coating Prepared on TA15 Alloy

Ni-SiC composite coatings were prepared on TA15 alloy by composite electroplating technology. The effects of the coating on friction and wear behavior of the substrate were investigated. The results show that the obtained coating is dense and compact, and possesses higher micro-hardness than the substrate. The coatings have superior friction and wear resistance than the substrate, as the mass losses of the coatings are much lower than those of the substrate under the same sliding conditions. The main wear mechanisms of the substrate sliding against both GCr15 and Al₂O₃ balls can be concluded as plough wear, adhesive wear accompanied by minor oxidation and abrasive wear. The main wear mechanisms of the Ni-SiC composite coating sliding against GCr15 ball can be set as extractions of the coating tissues and swear of the GCr15 ball on the coating surface, while the predoninate wear mechanisms of the coating sliding against Al₂O₃ ball could be fatigue wear and delamination abrasion.