为研究脉冲能量对电火花沉积制备Mo2FeB2基金属陶瓷涂层组织及性能的影响,在3种脉冲能量(1.35,6.41和17.81 J)下分别制备了沉积涂层.采用扫描电镜(SEM)、X射线衍射仪(XRD)、电子探针(EPMA)、显微硬度计及摩擦磨损实验机对涂层的组织与性能进行研究和表征.结果表明:3种脉冲能量所制备的涂层物相组成均由非晶相、马氏体和Fe3B相组成,脉冲能量17.81 J时涂层的非晶相含量最低;单个沉积点的溅射范围和涂层表面裂纹数随着脉冲能量的增大而增大,涂层厚度随脉冲能量增加到一定厚度后变化不显著;涂层与基体间形成良好的冶金结合.脉冲能量6.41 J时,涂层截面具有最高的峰值显微硬度1 349 HV0.05;同时,该涂层稳定阶段的摩擦因数(0.313)和1h磨损量(0.7 mg)均为3种涂层中最低,耐磨性最佳.
In order to investigate the effects of pulse energy on microstructure and properties of Mo2FeB2-based ceramet coatings,three kinds of coatings were prepared under different pulse energy (1.35,6.41 and 17.81 J) by electro-spark deposition.The microstructure and phase composition of the coatings were analyzed by XRD and SEM.Mircohardness test,friction and wear test were conducted for further investigation of their properties.The results show that all the coatings are consisted of amorphous,martensite and Fe3B.The content of amorphous phase is the lowest when the pulse energy is 17.81 J.The splash area of single spot and the quantity of cracks on the coatings surface increase with the pulse energy increasing,while the thickness variation is limited.Metallurgical bonding to the substrate is formed in all the coatings.The coating deposited at pulse energy of 6.41 J has a maximum peak microhardness of 1 395 HV0.05,the minimum mean friction coefficient (0.313) in the steady state and the minimum wear mass (0.7 mg) after 1 h of abrasion,indicating its better friction and wear performance.
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