用Al和Al_2O_3双靶磁控共溅射工艺在抛光铝合金衬底上制备了Al-Al_2O_3复合涂层,同时制备纯Al涂层作对比。利用X射线衍射仪和场发射扫描电镜研究了Al-Al_2O_3复合涂层的微观结构和形貌,通过划痕实验和电化学腐蚀实验对复合涂层的膜基结...用Al和Al_2O_3双靶磁控共溅射工艺在抛光铝合金衬底上制备了Al-Al_2O_3复合涂层,同时制备纯Al涂层作对比。利用X射线衍射仪和场发射扫描电镜研究了Al-Al_2O_3复合涂层的微观结构和形貌,通过划痕实验和电化学腐蚀实验对复合涂层的膜基结合力和耐腐蚀性能进行了测试。结果表明,Al-Al_2O_3复合涂层呈较强的Al(111)择优取向,Al_2O_3相以非晶形式存在。直流功率PDC恒定时,射频功率PRF增大,复合涂层中Al相晶粒更加细化,涂层的平整度和致密度明显提高。Al-Al_2O_3复合涂层与铝合金衬底的结合力良好,可达到43 N。相比纯Al涂层,Al-Al_2O_3复合涂层具有优异的耐腐蚀性,其中PRF=150 W的复合涂层的耐腐蚀性能最佳,腐蚀电流密度为0.0016 m A/cm^2,该值相比纯Al涂层降低了一个量级。展开更多
Solid contaminants in lubrication system will cause severe wear of sliding compo nents. In order to improve the wear resistance of the material in oil containing solid contaminants,the brush plated nano-Al2O3/Ni compo...Solid contaminants in lubrication system will cause severe wear of sliding compo nents. In order to improve the wear resistance of the material in oil containing solid contaminants,the brush plated nano-Al2O3/Ni composite coating was p repared and the influence of the sand content and sand size on the tribological property of the coating in oil containing solid contaminants was tested with bal l-on-disc tester. The results show that the wear volume increases with increas ing the sand content and sand size,and the wear resistance of the composite coa ting is 20% higher than that of the high-speed plain nickel coating. The main w ear mechanisms of the coatings are abrasive wear and adhesive wear. And due to t he nano-particle strengthening effect,the wear resistance of the composite coa ting is improved.展开更多
采用喷雾造粒、化学冶金包覆和固相合金化技术制备了Ni Co Cr Al Y/Al2O3复合粉体,并采用超音速火焰喷涂技术制备了Ni Co Cr Al Y/Al2O3复合涂层。采用SEM、XRD和马弗炉对该涂层和粉体的显微结构和抗氧化性能进行了研究。结果表明,Al2O...采用喷雾造粒、化学冶金包覆和固相合金化技术制备了Ni Co Cr Al Y/Al2O3复合粉体,并采用超音速火焰喷涂技术制备了Ni Co Cr Al Y/Al2O3复合涂层。采用SEM、XRD和马弗炉对该涂层和粉体的显微结构和抗氧化性能进行了研究。结果表明,Al2O3颗粒表面均匀致密的包覆着一层Ni Co Cr Al Y合金,Ni Co Cr Al Y/Al2O3复合粉体呈球形,颗粒大小均匀。超音速火焰喷涂Ni Co Cr Al Y/Al2O3复合涂层与基体结合良好,涂层孔隙率仅为(0.41±0.05)%。涂层抗氧化性能良好,氧化动力学曲线分为3个阶段:大斜率直线阶段,系数较小的抛物线阶段和斜率几乎为零的直线阶段。涂层在850℃氧化96 h以后,涂层氧化增重为2.5 mg·cm-2左右。复合涂层中氧化物膜的形成和Al2O3硬质相的加入是涂层抗氧化性能提高的主要原因。展开更多
文摘用Al和Al_2O_3双靶磁控共溅射工艺在抛光铝合金衬底上制备了Al-Al_2O_3复合涂层,同时制备纯Al涂层作对比。利用X射线衍射仪和场发射扫描电镜研究了Al-Al_2O_3复合涂层的微观结构和形貌,通过划痕实验和电化学腐蚀实验对复合涂层的膜基结合力和耐腐蚀性能进行了测试。结果表明,Al-Al_2O_3复合涂层呈较强的Al(111)择优取向,Al_2O_3相以非晶形式存在。直流功率PDC恒定时,射频功率PRF增大,复合涂层中Al相晶粒更加细化,涂层的平整度和致密度明显提高。Al-Al_2O_3复合涂层与铝合金衬底的结合力良好,可达到43 N。相比纯Al涂层,Al-Al_2O_3复合涂层具有优异的耐腐蚀性,其中PRF=150 W的复合涂层的耐腐蚀性能最佳,腐蚀电流密度为0.0016 m A/cm^2,该值相比纯Al涂层降低了一个量级。
文摘Solid contaminants in lubrication system will cause severe wear of sliding compo nents. In order to improve the wear resistance of the material in oil containing solid contaminants,the brush plated nano-Al2O3/Ni composite coating was p repared and the influence of the sand content and sand size on the tribological property of the coating in oil containing solid contaminants was tested with bal l-on-disc tester. The results show that the wear volume increases with increas ing the sand content and sand size,and the wear resistance of the composite coa ting is 20% higher than that of the high-speed plain nickel coating. The main w ear mechanisms of the coatings are abrasive wear and adhesive wear. And due to t he nano-particle strengthening effect,the wear resistance of the composite coa ting is improved.
文摘采用喷雾造粒、化学冶金包覆和固相合金化技术制备了Ni Co Cr Al Y/Al2O3复合粉体,并采用超音速火焰喷涂技术制备了Ni Co Cr Al Y/Al2O3复合涂层。采用SEM、XRD和马弗炉对该涂层和粉体的显微结构和抗氧化性能进行了研究。结果表明,Al2O3颗粒表面均匀致密的包覆着一层Ni Co Cr Al Y合金,Ni Co Cr Al Y/Al2O3复合粉体呈球形,颗粒大小均匀。超音速火焰喷涂Ni Co Cr Al Y/Al2O3复合涂层与基体结合良好,涂层孔隙率仅为(0.41±0.05)%。涂层抗氧化性能良好,氧化动力学曲线分为3个阶段:大斜率直线阶段,系数较小的抛物线阶段和斜率几乎为零的直线阶段。涂层在850℃氧化96 h以后,涂层氧化增重为2.5 mg·cm-2左右。复合涂层中氧化物膜的形成和Al2O3硬质相的加入是涂层抗氧化性能提高的主要原因。
