(湖南大学 材料科学与工程学院，长沙 410082)
摘 要: 采用新型喷射沉积技术制备SiC体积分数呈连续分布(0~30%)的Al-Si基梯度复合材料，利用MG−2000型销−盘磨擦磨损试验机，研究不同滑动转速和载荷对该梯度复合材料摩擦磨损性能的影响。采用SEM和MHV−2000型维氏硬度计研究该梯度复合材料的显微组织、硬度及其耐磨性的梯度分布规律。结果表明：随着滑动转速和载荷的增大，梯度材料的摩擦因数逐渐降低；材料的磨损率随载荷的增加而增大，随滑动转速的提高先增大后减小，在转速500 r/min时达到最大；对比研究沉积态与热压态材料的摩擦磨损行为，喷射沉积态由于孔隙等缺陷的存在，其磨损形式主要是磨粒磨损和剥层磨损；热压后，梯度材料的磨损形式以磨粒磨损和粘着磨损为主；随基体中SiC含量的逐渐增加，锭坯各部分硬度和耐磨性也随之提高。
关键字: Al-Si梯度复合材料；颗粒增强；耐磨性；磨损机制
（College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:The Al-17Si functionally graded material (FGM) with SiC volume fraction of 0−30% continuously were synthesized using new spray deposition technique. Furthermore, the microstructure, hardness and wear ability of this functionally graded material were studied with SEM, MHV−2000 Hervey hardness tester and MG−2000 pin-on-disc friction and wear testing machine. The results show that the friction coefficient decreases with increasing the applied load and sliding speed. The wear rate rises with the increase of applied load and it reaches the maximum at speed of 500r/min firstly, and then falls with increasing the sliding speed. Because of the existence of defects, such as the hole, the mainly wear way of the deposition is abrasive and delamination, while the composites after hot pressing is mainly abrasive and adhesive. The hardness and wear resistance of every part of materials increase with increasing the SiC content in the deposition billet.
Key words: Al-Si graded composite material; particle reinforcement; wear resistance; wear mechanism
