High temperature oxidation resistance and microstructure change of aluminized coating on copper substrate  

铜基体上渗铝层的高温抗氧化性能和组织变化(英文)

作　　者：王红星[1] 张炎[1] 成家林[1] 李玉山[1] 

机构地区：[1]南京工程学院材料工程学院,南京211167

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第1期184-190,共7页中国有色金属学报（英文版）

基　　金：Projects(CKJB201205,QKJB201202,YJK201307)supported by the Nanjing Institute of Technology,China

摘　　要：The outermost coating with single phase Ni2Al3 was obtained on copper surface by electrodepositing nickel followed by slurry pack aluminizing at 800 °C for 12 h. The oxidation resistance and microstructure of the coating oxidized in ambient air at 1000 °C for 25-250 h were investigated using SEM, X-ray diffraction and optical microscope methods. The results show that the copper with single phase Ni2Al3 coating possesses the best high temperature oxidation resistance, and the mass gain of the coating is 1/15 that of pure copper and 1/2 that of nickel coating, respectively. The specimen surface after being oxidized for 25 h still comprises Ni2Al3 phase. However, when the time of oxidizing treatment increases to 50 h, the Ni Al phase is formed. It is also found that the Ni2Al3 phase completely turns into Ni Al phase after oxidizing treatment for 100 h and above. The Ni Al coating shows excellent high temperature oxidation resistance when oxidation time is 250 h.以铜为基体,采用电镀镍和浆料包渗铝法,在800°C渗铝12 h制备出组织为Ni2Al3的单相渗层。采用SEM、XRD和光学显微镜,研究在1000°C下空气中氧化25~250 h,Ni2Al3渗层的高温抗氧化性能与组织转变行为。结果表明：Ni2Al3渗层在1000°C氧化250 h后,氧化增重分别为纯铜和镍镀层的1/15和1/2。氧化时间在25 h内时,渗层表面仍有Ni2Al3相;氧化50 h后,出现NiAl相;当氧化时间增加到100 h时,Ni2Al3相完全转变为NiAl相。当氧化到250 h时,渗层仍具有良好的抗高温氧化性能。

关 键 词：COPPER Ni2Al3 coating high temperature oxidation resistance NiAl phase pack aluminizing 

分 类 号：TG174.445[金属学及工艺—金属表面处理]