超音速火焰喷涂CoCrW涂层的高温抗氧化性能  

Oxidation resistance of high velocity oxy-fuel sprayed CoCrW coating at high temperature

作　　者：杨中元[1] 王林山[1] 李学锋[1] 古鸣 

机构地区：[1]北京有色金属研究总院,100088 [2]贵州黎阳航空发动机公司,平坝县561102

出　　处：《焊接》2007年第11期56-57,62,共3页Welding & Joining

摘　　要：采用超音速火焰喷涂工艺制备了CoCrW涂层,用增重法测试了涂层的高温抗氧化性能。试验结果表明,在氧化性气氛下,涂层在850℃以下或经过较短时间处理时,涂层氧化增重较少,而经850℃以上处理或经过较长时间处理时,涂层氧化增重明显,而且,处理后涂层的X射线衍射结果也证明在涂层中出现了铬和钴的氧化物。可见,CoCrW涂层的稳定使用温度应控制在850℃以下。CoCrW coating is manufactured by high velocity oxy-fuel(HVOF) spraying.Oxidation resistance of HVOF sprayed CoCrW coating is investigated by weight gain.The results show that the weight gain is inconspicuous for the coating below 850 ℃ or exposure in the oxidation environment after shorter time.Whereas the oxidation of the coating drastically increases over 850 ℃.The X-ray diffraction pattern of a CoCrW coating after oxidizing at 850 ℃ shows that there are Co3O4 and Cr2O3 phases in the internal coating.Hence the working temperature of HVOF sprayed CoCrW coating should be lower than 850 ℃.

关 键 词：CoCrW 超音速火焰喷涂 涂层 抗氧化性 

分 类 号：TG174.442[金属学及工艺—金属表面处理]