摘要
采用大气等离子喷涂设备在H13热作模具钢表面制备了不同纳米TiO2含量的Al2O3/TiO2陶瓷复合涂层,并应用扫描电镜（SEM）、X射线衍射仪（XRD）、显微硬度计、摩擦磨损试验机等研究了陶瓷复合涂层的微观形貌、物相组成、显微硬度及摩擦磨损性能。结果表明,不同纳米TiO2含量的Al2O3/TiO2陶瓷涂层均为层片结构,存在一定的孔隙和裂纹,纳米TiO2添加可以改善涂层表面质量。XRD图谱显示陶瓷涂层主要由α-Al2O3、γ-Al2O3和Rutile-TiO2相组成,Al2O3再结晶过程中部分α-Al2O3转变为γ-Al2O3,且再结晶过程发生晶粒细化。涂层显微硬度平均值为1153 HV0.2。纳米TiO2添加可以降低涂层摩擦因数,但其含量对涂层耐磨性影响不明显。
Al2O3/Ti O2ceramic coatings with different nano-TiO2contents were deposited on H13 hot-working die steel by air plasma spraying.The micro-morphology,phase composition,microhardness,friction and wear behavior were investigated by scanning electron microscope（SEM）,X-ray diffraction（XRD）,microhardness tester,and friction and wear tester.The results indicate that the typical microstructures of plasma sprayed coatings with different nono-TiO2contents are lamellar structure including pores and cracks;the nano-TiO2content can improve the surface qualities of ceramic coatings.The XRD patterns indicate that the coatings are mainly composed ofα-Al2O3,γ-Al2O3and Rutile-TiO2phases,and parts of Al2O3transformed fromαphase toγphase as well as grain refining occurred during the process of recrystallization.The average microhardness of the ceramic coating is as high as 1153 HV0.2.The friction coefficient of the coating can be reduced by adding nano-TiO2,but its content has no obvious effect on the wear resistance of the coatings.
作者
王超
陈小明
宋仁国
Wang Chao;Chen Xiaoming;Song Renguo(Jiangsu Key Laboratory of Materials Surface Science and Technology,Changzhou University,Changzhou Jimagsu 213164,China;Key Laboratory of Research on Hydraulic and Hydro-Power Equipment Surface Engineering Technotogy of Zhejiang Province,Hangzhou Zhejiang 310012,China;Standard ＆ Quality Control Research Institute,Ministry of Water Resources,Hangzhou Zhejiang 310012,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第10期192-196,共5页
Heat Treatment of Metals
基金
浙江省水利水电装备表面工程技术研究重点实验室开放课题(2017SLKL001)
