摘要
采用金相显微镜、透射电镜、X射线衍射仪、显微硬度计以及微动磨损机研究了激光重熔等离子喷涂锌铝基Al2O3复合陶瓷涂层的组织结构、硬度及其耐磨性能，研究结果表明：等离子喷涂层由α-Al2O3和γ-Al2O3组成，层间为机械结合界面；经激光重熔后的组织为单一的体心四方结构的δ-Al2O3相，其点阵常数a0=7．943×10^-8cm，c0=23．500×10^-8cm，Al2O3与基体间的界面结合状况得到明显改善；熔覆后的Al2O3涂层硬度达150～170HV100g，耐磨性能（S=1．988）比基体材料（S=2．837）有较大提高，其磨损机制是疲劳磨损和磨粒磨损，但以磨粒磨损为主。
The wear resistance, Vickers hardness and structure of Al2O3 ceramic coatings on Zn - Al based alloy were studied by optical microscopy, transmission electronic microscopy, X - ray diffraction, micro hardmeter and micro driving abrading machine. The results show that the plasma sprayed coatings consists of α - Al2O3 and γ-Al2O3. There is a mechanically combined interface between Al2O3 coatings and substrate. The Al2O3 ceramic phase in the coatings cladded by laser is body -centered tetragunal δ -Al2O3 , of which lattice parameters are： a0 = 7. 943 × 10^-8cm ,c0= 23.500 × 10^-8cm. An interfacial phase of metallurgical combination and a little composition gradient are observed between Al2O3 and substrate. The hardness of Al2O3 coatings cladded by laser is about 150 -170 HV100g and the wear resistance（ S = 1. 988 ） is greatly improved compared with that of Zn - Al based alloy substrate （ S = 2. 837 ）. In addition, the wear mechanism is fatigue wear and abrasive wear, but mainly is abrasive wear.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2006年第1期36-38,45,共4页
Materials Science and Technology
关键词
氧化铝陶瓷
激光熔覆
硬度
耐磨性
锌铝合金
Al2O3 ceramic
laser remehing
vickers hardness
wear resistance
Zn-Al alloy
