摘要
利用金属诱发无压浸渗技术制备的B_4C/Mg复合材料为实验材料,研究该材料的磨损行为与磨损机制。在销盘式实验装置上对施加不同载荷(20、40、60和80N)以及磨损速率为250r/min实验条件下的磨损行为进行评价。结果表明:B_4C/Mg复合材料在所施加载荷下均比纯Mg基体表现出更优异的抗磨性能。作为诱发浸渗剂的金属Ti颗粒,其含量对B_4C/Mg复合材料的磨损性能具有一定影响。纯Mg基体的主要磨损机制是磨粒磨损;而对于B_4C/Mg复合材料,当施加载荷较低时,主要磨损机制为粘着和层离;当施加载荷较高时,其磨损机制为加热软化熔化或塑性变形。
The B4C/Mg composites fabricated by metal-assisted pressureless infiltration technique were used as experimental material, and the wear behavior and mechanism of this material were studied. A pin-on-disc apparatus was used to evaluate the wear behavior where loads of 20, 40, 60 and 80 N, and a sliding velocity of 250 r/min were exerted. The results show that B4C/Mg composites possess superior wear resistance than pure Mg under various applied loads, and the content of Ti, as infiltration inducer, has an influence on the wear resistance of B4C/Mg composites. The dominant wear mechanism for pure Mg is abrasion, while that for B4C/Mg composites under low loads is adhesion and delamination. Under high loads, the wear mechanism of B4C/Mg composites can be attributed to thermal softening and melting or plastic deformation.
基金
Project(51271051)supported by the National Natural Sciecne Foundation of China
