工程科学学报，第40卷，第5期：605-611.2018年5月 Chinese Joural of Engineering,Vol.40,No.5:605-611,May 2018 DOI:10.13374/j.issn2095-9389.2018.05.011;http://journals.ustb.edu.cn 镁锂合金表面含碳陶瓷层的摩擦性能 张玉林)，朱鑫彬)，于佩航2)，左佑2》，张优)，陈飞)四 1)北京石油化工学院材料科学与工程学院，北京1026172)北京化工大学材料科学与工程学院，北京100029 ☒通信作者，E-mail:chenfei(@bipt.edu.cn 摘要通过在N,SiO,~KOH基础电解液中加入石墨烯添加剂，在镁锂合金表面制备出一层自润滑的含碳陶瓷层.利用扫 描电镜、原子力显微镜以及X射线衍射仪分析了陶瓷层的表面形貌、粗糙度以及物相组成，利用摩擦磨损试验仪对陶瓷层在 室温下的摩擦学性能进行研究.其结果表明，加人石墨烯后制备出的含碳陶瓷层表面放电微孔分布均匀，且其微孔尺寸和表 面粗糙度均明显降低.相比于镁锂合金，陶瓷层的表面硬度也得到明显的提高.此外，含碳陶瓷层主要由SO2、Mg,Si0:以及 Mg0物相组成，而石墨烯则以机械形式弥散分布于陶瓷层中并起到减摩作用.当石墨烯体积分数为1%时，陶瓷层表面显微 硬度为1317.6HV。4,其摩擦系数仅为009，其耐磨性明显提高.同时，陶瓷层磨痕的深度和宽度均明显小于镁锂合金，而且 较为光滑，表明陶瓷层表面没有发生严重的黏着磨损. 关键词镁锂合金：石墨烯：微弧氧化：诚摩性：耐磨性 分类号TG174.4 Friction properties of C-containing ceramic coatings on an Mg-Li alloy ZHANG Yu-lim”,ZHU Xin-bin”,YU Pei--hamg2》,ZU0Yom》,ZHANG You'',CHEN Fei 1)College of Materials Science and Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China 2)College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China Corresponding author,E-mail:chenfei@bipt.edu.cn ABSTRACT Due to its specific strength,superior electromagnetic shielding and excellent processing capabilities,the magnesium- lithium (Mg-Li)alloy is regarded as one of the most promising structural metal materials and has been extensively applied in various fields such as aerospace,offshore engineering,and the communication industry.Unfortunately,inferior tribological behavior,caused by low hardness,a fluctuating friction coefficient,and serious adhesive wear,has severely inhibited large-scale application of Mg-Li alloys in industrial engineering.Therefore,in this study,to enhance the tribological performance of a micro-arc oxidation(MAO)-pro- duced ceramic coating on an Mg-Li alloy,a variety of inorganic particles were tentatively added to MAO electrolytes to prepare compos- ite ceramic coatings with pronounced friction and wear resistance properties.MAO in NaSiO-KOH electrolytes with graphene addi- tives was used to produce self-lubricating C-containing ceramic coatings on an Mg-Li alloy.The surface morphologies,roughness, hardness,and phase compositions were investigated using scanning electron microscopy (SEM),atomic force microscopy (AFM),a Vickers hardness test,and X-ray power diffraction (XRD).At room temperature,the tribological properties of the ceramic coatings were evaluated by friction and wear tests.The results indicate that the micro-pores in the C-containing coatings distribute uniformly on the alloy surfaces and a significant decrease in micro-pore size and surface roughness is observed.The surface hardness of the coatings show significant enhancement compared with that of the Mg-Li alloy.The coatings mainly consist of SiO,MgSiO,and Mgo phases; graphene is dispersed throughout via mechanical effects and displayed an antifriction effect.The C-containing coating produced when the volume fraction of graphene in the electrolyte is 1%show good wear resistance and its surface hardness and friction coefficient are 收稿日期：2017-07-05 基金项目：国家自然科学基金资助项目(51601015)：大学生研究训练计划资助项目(2017J00174,201700175)工程科学学报,第 40 卷,第 5 期:605鄄鄄611,2018 年 5 月 Chinese Journal of Engineering, Vol. 40, No. 5: 605鄄鄄611, May 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 05. 011; http: / / journals. ustb. edu. cn 镁锂合金表面含碳陶瓷层的摩擦性能 张玉林1) , 朱鑫彬1) , 于佩航2) , 左 佑2) , 张 优1) , 陈 飞1) 苣 1) 北京石油化工学院材料科学与工程学院, 北京 102617 2) 北京化工大学材料科学与工程学院, 北京 100029 苣 通信作者,E鄄mail:chenfei@ bipt. edu. cn 摘 要 通过在 Na2 SiO3 鄄鄄KOH 基础电解液中加入石墨烯添加剂,在镁锂合金表面制备出一层自润滑的含碳陶瓷层. 利用扫 描电镜、原子力显微镜以及 X 射线衍射仪分析了陶瓷层的表面形貌、粗糙度以及物相组成,利用摩擦磨损试验仪对陶瓷层在 室温下的摩擦学性能进行研究. 其结果表明,加入石墨烯后制备出的含碳陶瓷层表面放电微孔分布均匀,且其微孔尺寸和表 面粗糙度均明显降低. 相比于镁锂合金,陶瓷层的表面硬度也得到明显的提高. 此外,含碳陶瓷层主要由 SiO2 、Mg2 SiO4 以及 MgO 物相组成,而石墨烯则以机械形式弥散分布于陶瓷层中并起到减摩作用. 当石墨烯体积分数为 1% 时,陶瓷层表面显微 硬度为 1317郾 6 HV0郾 1 kg,其摩擦系数仅为 0郾 09,其耐磨性明显提高. 同时,陶瓷层磨痕的深度和宽度均明显小于镁锂合金,而且 较为光滑,表明陶瓷层表面没有发生严重的黏着磨损. 关键词 镁锂合金; 石墨烯; 微弧氧化; 减摩性; 耐磨性 分类号 TG174郾 4 收稿日期: 2017鄄鄄07鄄鄄05 基金项目: 国家自然科学基金资助项目(51601015);大学生研究训练计划资助项目(2017J00174,2017J00175) Friction properties of C鄄containing ceramic coatings on an Mg鄄鄄Li alloy ZHANG Yu鄄lin 1) , ZHU Xin鄄bin 1) , YU Pei鄄hang 2) , ZUO You 2) , ZHANG You 1) , CHEN Fei 1) 苣 1) College of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China 2) College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China 苣 Corresponding author, E鄄mail: chenfei@ bipt. edu. cn ABSTRACT Due to its specific strength, superior electromagnetic shielding and excellent processing capabilities, the magnesium鄄 lithium (Mg鄄鄄Li) alloy is regarded as one of the most promising structural metal materials and has been extensively applied in various fields such as aerospace, offshore engineering, and the communication industry. Unfortunately, inferior tribological behavior, caused by low hardness, a fluctuating friction coefficient, and serious adhesive wear, has severely inhibited large鄄scale application of Mg鄄鄄 Li alloys in industrial engineering. Therefore, in this study, to enhance the tribological performance of a micro鄄arc oxidation (MAO)鄄pro鄄 duced ceramic coating on an Mg鄄鄄Li alloy, a variety of inorganic particles were tentatively added to MAO electrolytes to prepare compos鄄 ite ceramic coatings with pronounced friction and wear resistance properties. MAO in Na2 SiO3 鄄鄄KOH electrolytes with graphene addi鄄 tives was used to produce self鄄lubricating C鄄containing ceramic coatings on an Mg鄄鄄 Li alloy. The surface morphologies, roughness, hardness, and phase compositions were investigated using scanning electron microscopy (SEM), atomic force microscopy (AFM), a Vickers hardness test, and X鄄ray power diffraction (XRD). At room temperature, the tribological properties of the ceramic coatings were evaluated by friction and wear tests. The results indicate that the micro鄄pores in the C鄄containing coatings distribute uniformly on the alloy surfaces and a significant decrease in micro鄄pore size and surface roughness is observed. The surface hardness of the coatings show significant enhancement compared with that of the Mg鄄鄄Li alloy. The coatings mainly consist of SiO2 , Mg2 SiO4 , and MgO phases; graphene is dispersed throughout via mechanical effects and displayed an antifriction effect. The C鄄containing coating produced when the volume fraction of graphene in the electrolyte is 1% show good wear resistance and its surface hardness and friction coefficient are