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为了提高铌合金的抗高温氧化性能,先对铌合金C103进行包埋渗铝处理,再进行微弧氧化(MAO)处理获得Al2O3陶瓷膜.对涂层的形貌、硬度、成分及高温氧化增重进行分析,通过单因素法优选了微弧氧化电解液配方.采用最佳电解液配方制备复合涂层(MAO/Al/C 103),并与仅经包埋渗铝制备的涂层(Al/C103)进行对比分析,研究了复合涂层的抗高温氧化性能.结果表明:根据MAO膜层的硬度和厚度,获得微弧氧化的最佳电解液配方为10.0 g/LNaAlO2+5.0 g/L NaOH+7.0 g/L Na2WO4+5.0 g/L NaF+2.5 g/L Na2EDTA;在1 100℃高温氧化下,MAO/Al/C103试样氧化10 h的增重为5.5 mg/cm2,小于Al/C103试样的9.4 mg/cm2,表现出更好的抗氧化性.

Al2O3 ceramic film was prepared by micro-arc oxidation (MAO) process on C 103 niobium alloy previously treated by pack cementa tion aluminizing.The electrolyte concentration during MAO process was adjusted and the optimum technological parameters were obtained.High-temperature oxidation resistance of the MAO/Al/C103 sample and Al/C103 sample only prepared by pack cementation aluminizing was studied and compared.Results showed that the micro-arc oxidation optimum electrolyte recipes were as follows:10.0 g/L NaAl02 + 5.0 g/L NaOH+7.0 g/L Na2WO4+5.0 g/L NaF+2.5 g/L Na2EDTA.Mass gain of Al/C103 specimen was 9.4 mg/cm2 after isothermal oxidation at 1 100 ℃ for 10 h,which exceeded that of MAO/Al/C103 specimen with 5.5 mg/cm2.MAO/Al/C103 exhibited better high-temperature oxidation resistance.

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