摘要
利用5 kW横流连续CO2激光器在45#钢基体上熔覆FeAl基合金及TiC硬质相增强FeAl基复合材料涂层,并研究了稀土氧化物La2O3对两种涂层显微结构和摩擦磨损性能的影响。结果表明添加稀土能够减少甚至消除FeAl基合金涂层中存在的孔洞,提高致密性,并能稳定、降低摩擦系数;添加质量分数1%的稀土对TiC硬质相增强FeAl基复合材料涂层的组织和摩擦性能影响不大。涂层的硬度和磨损形貌表明添加稀土对两种涂层硬度的影响不大,但能够使涂层表面的硬度值比较均匀一致,从而引起磨损表面的相对均匀与光滑。FeAl基合金涂层的磨损机理为轻微的磨粒磨损,TiC硬质相增强FeAl基复合材料涂层的磨损机理为磨粒磨损与脆性剥离。
FeAl based alloys and TiC Reinforced composites coatings were prepared on 45# steel by laser cladding with 5 kW cross flow continue CO2 laser.The influences of rare-earth oxides La2O3 on microstructure and tribological property were studied.The results show that rare-earth can eliminate the microholes,improve compactness and stabilize,and lower the friction factor in FeAl based alloy coating;the effect of mass fraction of 1% of the rare-earth on refinement for TiC reinforced composites coating is not evident.According to the hardness and worn morphology of the coatings,addition of the rare-earth has little effection on the hardness of coatings but leads to uniform hardness values and smooth worn surface.The wear mechanism of FeAl-based alloy coating is abrasive wear and that of TiC reinforced composites coating is combination of abrasive wear and brittle peeling.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2010年第1期271-276,共6页
Chinese Journal of Lasers
基金
国家自然科学基金(50575034)资助课题
