晶面及液体环境对氧化镓研磨过程摩擦学特性的影响研究

Study on the Influence of Crystal Surface and Liquid Environment on the Tribological Properties of Gallium Oxide During Lapping

目的探讨具有各向异性的氧化镓晶片不同晶面的研磨加工差异。方法通过化学气相沉积法制备了高质量的自支撑金刚石厚膜,采用扫描电镜及拉曼光谱对其进行表征,将其作为摩擦副材料,在三种不同液体环境下研磨β-Ga_(2)2O_(3)晶片的(100)晶面及(010)晶面,比较摩擦学特性的差别。借助三维扫描系统、扫描电镜及EDS能谱,观察与分析了加工后的氧化镓及自支撑金刚石厚膜的表面形貌、成分及磨损机理。结果 (100)晶面及(010)晶面在去离子水环境中的摩擦系数最大,而当液体环境为乙二醇及三乙醇胺溶液时,研磨过程中形成了很薄的化学反应膜,减少了犁沟效应,摩擦系数较小。且在液体环境为三乙醇胺时,加工后氧化镓晶片的(100)晶面及(010)晶面的粗糙度最小。研磨加工后,(010)晶面比(100)晶面的表面粗糙度(Ra)小。结论 (010)晶面与(100)晶面在不同液体环境下研磨加工存在一定的差异性,(010)晶面比(100)晶面更易获得较好的表面质量。加工过程中,磨损机理为先产生二体磨损,一段时间后再形成三体磨粒磨损。

This work aims to investigate the difference of lapping process between different crystal surfaces of anisotropic gallium oxide wafer.High quality self-supporting diamond thick films were prepared by CVD method,which were characterized by SEM and Raman spectroscopy.They were used as tools to lap(100)and(010)crystal surfaces ofβ-Ga2O3 wafers in three different liquid environments to compare the tribological properties.The surface morphology,composition and wear mechanism of the tools were observed and analyzed by means of three-dimensional scanning system,SEM and EDS.The friction coefficients of(100)and(010)crystal surfaces are the highest in deionized water.When the liquid environment is glycol and triethanolamine solution,a very thin chemical reaction film is formed in the process,which reduces the furrow effect and the friction coefficient is small.The results show that the surface roughness of(100)and(010)crystal faces is the lowest when the liquid environment is triethanolamine.The surface roughness Ra of(010)crystal surface is smaller than that of(100)crystal surface after machining.There are some differences between(010)crystal surface and(100)crystal surface in different liquid environment,and(010)crystal surface is easier to obtain better surface quality than(100)crystal surface.In the process of machining,the wear mechanism is that two body wear occurs at first,and then three body wear occurs after a period of time.