摘要
采用大气等离子喷涂的方法制备了纳米和微米Al2O3-TiO2涂层,其中w(TiO2)=13%.分析了涂层组织形貌特征和结合强度等性能,研究了两种涂层在不同载荷下的摩擦磨损性能.结果表明,纳米Al2O3-TiO2涂层是由未熔或半熔纳米颗粒区域与完全熔融粒子铺展区域共同构成的,孔隙率低,显微硬度、结合强度均高于层状结构的微米涂层,且纳米涂层磨损量明显小于微米涂层.高载荷下磨屑均匀细化、圆整,形成微滚珠效应,纳米涂层稳态摩擦系数随载荷增大而下降,而微米涂层摩擦系数随载荷变化不明显.
Nano-structured and microscale-structured Al2O3-TiO2 coatings were prepared by air plasma spraying（APS）.The friction and wear behaviors of the two coatings at different loads were investigated with SRV friction and wear testing machinery.The micro structure,the porosity,the micro-hardness and bonding strength of the coatings were investigated as well.The wear mechanism was studied from the morphology of triturate.Results show that the microstructure of the nano-structured Al2O3-TiO2 coatings consist of two distinct regions.One is formed from completely melted agglomerated power and the other is incompletely melted with a particulate microstructure retained from the starting agglomerates,and the properties of micro hardness and bonding strength of the nano-structured coating is better than the microscale-structured Al2O3-TiO2 coating.The friction coefficient decreases with the increase of load,and the triturate will become fine,uniform and round under high load,which improves the contacting state between the friction pair.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2010年第7期878-882,共5页
Transactions of Beijing Institute of Technology
基金
国家部委预研项目(203010913)
