The oxidation kinetics at 960 ℃ of RTCr28Ni15 and RTCr18Ni4 used for grate in garbage incinerator were studied by weight gain method.The microstructure, cross section, composition and the oxidation resistance mechanism of these two alloys' oxidation films generated after heating at 960 ℃ for 100 h were analyzed by using of XRD, SEM and EDS.The results show that both the oxidation curves of RTCr28Ni15 and RTCr18Ni4 increase fast at the first stage and then slow down,but the oxidation rate of RTCr18Ni4 is faster than RTCr28Ni15.There is no protective oxidation film that forms on surface of RTCr18Ni4, so its oxidation resistance at 960 ℃ is weak.However RTCr28Ni15 is totally oxidation iesistant at 960 ℃ due to the protectiveoxidation film formed on its surface and its oxidation resistance is superior to RTCr18Ni4.%采用增重法研究了垃圾焚烧炉用炉排片RTCr28Ni15和RTCr18Ni4的960℃氧化动力学;利用XRD、SEM和EDS对这两种合金经960℃×100h恒温氧化后的氧化膜的微观形貌、横断面和组成及其抗氧化机理进行了分析研究.结果表明:RTCr28Ni15和RTCr18Ni4的氧化动力学曲线在前期上升都较快,后期减缓,但RTCr18Ni4试样氧化速度明显大于RTCr28Ni15;在试验条件下,RTCr18Ni4表面没有形成保护性氧化膜,为弱抗氧化级,而RTCr28Ni15表面形成了保护性氧化膜,为完全抗氧化级,其抗氧化性明显优于RTCr18Ni4.
展开▼
