激光熔凝NiAl/纳米Al_2O_3化学复合镀层抗高温氧化性能  

High-Temperature Oxidation Resistance of Laser Remelted Electroless NiAl/Nano Al_2O_3 Composite Coating

作　　者：杨理京[1] 孔凡志[1] 姚建华[1] 

机构地区：[1]浙江工业大学激光加工技术工程研究中心,浙江杭州310014

出　　处：《激光与光电子学进展》2013年第1期164-168,共5页Laser & Optoelectronics Progress

基　　金：浙江省教育厅科研项目(20070305);浙江省重中之重学科开放基金(20100702)资助课题

摘　　要：采用大功率连续横流CO2激光对化学复合镀NiAl/纳米Al2O3复合镀层进行激光熔凝处理,并对熔凝层的抗高温氧化性能进行研究。采用X射线衍射仪(XRD)、扫描电镜(SEM)和能谱仪(EDS)等分别对高温氧化前后的表面形貌、物相组织和元素组成进行表征分析。与复合镀层和基体试样相比,激光熔凝后表面抗高温氧化性能明显提高,这一方面与激光熔凝镀层中的金属间化合物NiAl2O4、Ni0.77AlFe0.23在800℃时具有良好的抗高温氧化性有关,另一方面是由于激光熔凝后镀层表面形成了连续致密的氧化膜。Transverse-flow CO2 laser is used to strengthen the NiA1/nano AI2O3 electroless composite plating by laser remelting. Then high-temperature oxidation resistance experiments at 800℃ of laser remelted coating are carried out. The surface profile, microstructure and high-temperature oxidation resistance of plated coatings before and after laser remelting are analyzed by energy dispersive X-ray spectrum （EDS）, scanning electron microscopy （SEM） and X-ray diffractometry （XRD）. The high-temperature oxidation resistance of laser remelted coating is remarkably improved compared with the original composite plate and substrate. On the one hand, the intermetallics NiAI2O3 and Ni0.77A1Fe0.23 of laser remelted coating contribute to enhance high-temperature oxidation resistance at 800 ℃ ; on the other hand, a dense and continuous oxidation film is formed on the coating surface after laser remelting.

关 键 词：激光技术 激光熔凝 化学复合镀 抗高温氧化性 激光复合表面改性 

分 类 号：TN29[电子电信—物理电子学]