摘要
为了提高TC4合金的耐磨性能,采用激光热喷涂技术在其表面制备了Co_(30)Cr_(8)W_(1.6)C_(3)Ni_(1.4)Si涂层。通过扫描电子显微镜(SEM)和X射线衍射(XRD)分析了涂层的形貌和物相,并通过摩擦磨损实验研究了涂层在PAO+2.5%Mo DTC(质量分数)油中的磨损行为。结果表明,激光热喷涂的Co_(30)Cr_(8)W_(1.6)C_(3)Ni_(1.4)Si涂层主要由Ti、WC_(1-x)、Co O、Co_(2)Ti_(4)O和Co Al相组成,在涂层界面形成冶金结合。在激光功率为1000、1200和1400 W时所制备的涂层平均摩擦因数分别为0.151、0.120和0.171,其对应的磨损率分别为1.17×10^(-6)、1.33×10^(-6)和2.80×10^(-6)mm^(3)·N^(-1)·m^(-1),磨损机理为磨粒磨损,其枝晶尺寸对降磨起主要作用。
To elevate the wear resistance of TC4 alloy,Co_(30)Cr_(8)W_(1.6)C_(3)Ni_(1.4)Si coating was fabricated on the surface by laser thermal spraying(LTS).The morphologies and phases of obtained coatings were analyzed by scanning electronic microscope(SEM)and Xray diffraction(XRD),respectively.The friction and wear properties of the coatings in poly-alpha-olefin(PAO)+2.5 w%molybdenum dithiocarbamate(MoDTC)oil were investigated by wear tester.The results show that the laser thermal sprayed Co_(30)Cr_(8)W_(1.6)C_(3)Ni_(1.4)Si coatings are primarily composed of Ti,WC_(1-x),CoO,Co_(2)Ti_(4)O and CoAl phases,and the metallurgical bonding forms at the coating interface.The average coefficient of friction(COF)of CO30Cr8 W1.6C3 Ni1.4Si coatings fabricated at the laser power of 1000,1200 and1400 W is 0.151,0.120,and 0.171 with corresponding wear rate of 1.17×10^(-6),1.33×10^(-6)and 2.80×10^(-6)mm^(3)·N^(-1)·m^(-1),respectively,which increases with the increase of laser power.The wear mechanism is abrasive wear,and the dendrite size is the dominant role of anti-wear.
作者
徐健晏
孔德军
Xu Jianyan;Kong Dejun(College of Mechanical Engineering,Changzhou University,Changzhou 213164,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2021年第5期1542-1548,共7页
Rare Metal Materials and Engineering
基金
Key Research and Development Project of Jiangsu Province(BE2016052)。
