添加纳米氧化物颗粒对TC4合金磨损行为的影响

Effect of supply of nano-oxide particles on wear behavior of TC4 alloy

摘要:

采用MPX-2000销盘式摩擦磨损试验机对TC4合金/GCr15钢进行滑动磨损实验,在摩擦界面人工添加纳米氧化物颗粒研究了氧化物种类和颗粒尺寸对TC4合金磨损行为的影响；采用XRD、SEM、EDS等方法表征了TC4合金的磨损特征并探讨了磨损机制。结果表明：氧化物颗粒的种类和尺寸对于TC4合金的磨损行为具有显著影响：TiO₂颗粒急剧促进TC4合金磨损,而Fe₂O₃显著降低磨损；Fe₂O₃粒径越小,TC4合金的磨损失重越小且几乎不随载荷变化而波动。摩擦界面添加TiO₂时,磨损机制与未添加氧化物颗粒的相似,以磨粒磨损和粘着磨损等严重磨损机制为主；当添加Fe₂O₃时,磨损机制由严重向轻微磨损转变。

Abstract:

Sliding wear tests were performed of TC4 alloy/GCr15 steel on the MPX-2000 pin-on-disk wear tester. The effect of nano-oxide particles artificially supplied onto the sliding interface on the wear behavior of TC4 alloy was studied by varying the type and diameter of oxide particles. The wear characteristics of alloy were examined by XRD, SEM and EDS, the wear mechanism of TC4 alloy being discussed subsequently. Results showed that the type and diameter of oxide particles had significant influences on the wear behavior of TC4 alloy. Its wear loss was aggravated fleetly by TiO₂ oxide particles, whereas it was improved in the case of Fe₂O_3. The wear loss of TC4 alloy was getting smaller with the decreasing particle diameter of Fe₂O₃, which was almost independent of the applied load. When the TiO₂ was supplied, the wear mechanism of TC4 alloy was mainly abrasive and adhesive wear as the same as that without any additives. The severe-to-mild wear transition occurred when Fe₂O₃ oxide particles were supplied.