CHE Chengwei ZHANG Zhiming DONG Xianglin LIU Chengliang Harbin Institute of Technology
,
Harbin
,
150006
,
ChinaInstitute of Metal Research
,
Academia Sinica Shenyang
,
110015
,
China
材料科学技术（英文）
The behaviour of oxidation at elevated tem- peratures and fretting in the laser-alloyed layer of Ti-6Al-4V with the addition of Pr was studied. The results show that the addition of Pr changes the structure of oxide scale of Ti-6Al-4V,controls the short-range diffusion of oxygen to the scale/substrate interface and increases the adhe- sion and ductility of the scale,thus changing the oxidation kinetics and considerably reducing oxidation rate.The analysis of fretting test shows that the existence of high hardness layer in the al- loyed zone,fine dendrites perpendicular to the sur- face of the high hardness layer and the oxide scale produced during fretting at elevated temperatures are all beneficial to the improvement of wear resist- ance.
关键词:
laser modification
,
null
,
null
,
null
任鑫
,
朱鹤
,
张若愚
,
王峰
,
谷永旭
腐蚀学报（英文）
在45号钢表面制备了均匀的Ni-P-纳米Al2O3化学复合镀层,通过高功率连续CO2激光处理镀层表面.采用扫描电镜(SEM)观察了镀层表面形貌,用X射线衍射仪(XRD)进行物相分析,对激光处理前后的镀层硬度、耐磨性进行了研究,采用极化曲线研究了镀层在3.5％NaC1溶液中的腐蚀行为.结果表明,随着激光功率的增加,复合镀层的表面由平整到粗糙,表面纳米Al2O3数量逐渐减少;镀态复合镀层主要为非晶结构,激光改性后的镀层发生晶化,析出稳定相Ni和Ni3P.硬度和耐磨性随激光功率的增大先升高后降低.极化曲线结果表明,镀层耐蚀性随着激光功率的增加而有所降低.在激光功率为400W时,改性镀层的综合性能达到最佳值.
关键词:
化学复合镀
,
激光改性
,
硬度
,
耐磨性
,
耐蚀性
TAO Zengyi WANG Aihua ZHU Beidi DENG Shijun CHENG Xudong FU Jiangmin Huazhong University of Science and Technology Wuhan
,
430074
,
ChinaWuhan Research Institute of Material Protection
,
Wuhan
,
430000
,
China
材料科学技术（英文）
An alumina coating was developed on mild carbon steel by plasma spraying and then modified by laser remelting.Some characteristics of plasma sprayed ceramic coating before and after laser remelting,such as microstructure,wear resistance, heat shock resistance,hot corrosion property and bond strength,have been investigated in this paper.
关键词:
plasma spraying
,
null
,
null
陈长军
,
张敏
,
张诗昌
,
常庆明
,
周家林
材料导报
镁及其合金具有优异的物理及机械性能,从而在许多领域得到应用.但其不耐磨性限制了镁合金在汽车和航空工业中的应用.最简单且有效的解决办法是在镁合金表面施加耐磨涂层.综述了几种新的表面耐磨涂层技术,即激光表面改性涂层(激光表面重熔/激光表面合金化/激光表面熔敷)、表面纳米陶瓷涂层和微弧氧化陶瓷基涂层,并分析了它们的研究和应用前景.
关键词:
镁合金
,
耐磨涂层
,
激光表面改性
