微量不同Ag含量TiAlAgN-TiSiN复合涂层微观结构及磨损性能的研究

Microstructure and wear properties of TiAlAgN-TiSiN composite coatings with micro amount of different Ag content

实验采用电弧离子镀技术利用Ti50Al49Ag1、Ti50Al45Ag5和Ti50Si20合金靶复合沉积制备了不同Ag含量的TiAlAgN-TiSiN复合涂层。利用球-盘式摩擦磨损试验机研究了室温、200、400、600℃等温度下的摩擦学性能;通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、显微硬度计、表面轮廓仪、划痕仪对磨损前后涂层的表面形貌、微观结构、硬度及涂层结合力进行分析。结果表明:TiAlAgN-TiSiN(0.10%(原子分数)Ag)、TiAlAgN-TiSiN(0.25%Ag)涂层的厚度分别为为5.78、7.06μm,硬度分别为2649.9(Hv0.2)、2361.0(Hv0.2);不同Ag含量的TiAlAgN-TiSiN涂层的衍射峰位都对应于面心立方TiAlN,择优取向均为为N(220)面。两种涂层在不同温度下的磨损机理主要为黏着磨损为与磨粒磨损。室温及600℃时TiAlAgN-TiSiN(0.12%Ag)涂层比TiAlAgN-TiSiN(0.25%Ag)更耐磨,400℃时两涂层耐磨效果最佳。此外,当Ag含量在0%~1%范围内增加时,涂层的结合力不断增加。

TiAlAgN-TiSiN composite coatings with micro amount of different Ag content were prepared by arc ion plating using Ti50Al49Ag1,Ti50Al45Ag5 and Ti50Si20 alloy targets.The tribological properties at room temperature,200℃,400℃and 600℃were studied by using the ball disk friction and wear testing machine.The surface morphology,microstructure,hardness and adhesion of the coatings before and after wear were analyzed by scanning electron microscope(SEM),X-ray diffraction(XRD),microhardness tester,surface profiler and scratch tester.The results show that the thickness of TiAlAgN-TiSiN(0.10%Ag)and TiAlAgN-TiSiN(0.25%Ag)composite coatings was 5.78 um and 7.06 um,and the hardness was 2649.9(HV0.2)and 2361.0(HV0.2),respectively.The diffraction peaks of TiAlAgN-TiSiN composite coatings with different Ag contents corresponded to face centered cubic TiAlN,and the preferred orientation was N(220)face.The main wear mechanism of the two coatings at different temperatures was adhesive wear and abrasive wear.TiAlAgN-TiSiN(0.10%Ag)coating was more wear-resistant than TiAlAgN-TiSiN(0.25%Ag)coating at room temperature and 600℃,and the best wear-resistant effect was obtained at 400℃.In addition,when the Ag content increased in the range of 0.10%-0.25%,the adhesion of the coating increased.