SUS430合金La_(0.75)Sr_(0.25)MnO_3涂层的喷涂法制备及性能研究

Study on the Properties of LSM coated SUS430 Alloy Prepared by Spray Method

以La0.75Sr0.25MnO3纳米粉体为原料,采用冷喷涂的方法制备了SUS430合金的LSM涂层。分析了涂层的物相,对涂层的表面和断面形貌进行了观察,并测试了涂层的抗氧化性能和导电性能。结果表明,制得的SUS430合金LSM涂层主要物相为LSM钙钛矿相,涂层致密、与基体结合紧密且厚度均匀;SUS430/LSM样品的ASR值随温度升高呈指数下降趋势,温度高于400℃时其值接近SUS430合金的ASR值;LSM涂层可有效改善SUS430合金的高温抗氧化性,SUS430/LSM的氧化增重速率比SUS430合金约低一个数量级,长期运行情况下前者具有更低的ASR值。

The LSM coating of SUS430 alloy was prepared with La0.75Sr0.25MnO3 nano-powder using spraying method. The phase, surface morphology and cross-section morphology of LSM coating were investigated, and the oxidation resistance and the electrical conductivity were test. The results showed that the main phase of LSM coating of SUS430 alloy was perovskite phase, the LSM coating was dense and combined with the metallic matrix closely with uniform thickness. The ASR value of SUS430/LSM specimen exponentially decreased as the temperature increased, and when the temperature higher than 400℃ the ASR value of SUS430/LSM was close to that of SUS430 alloy. The LSM coating can effectively improve the high temperature oxidation resistance of SUS430 alloy, the rate of weight gain of SUS430/LSM were about one order of magnitude lower than that of SUS430 alloy, and the value of ASR of SUS430/LSM would be lower than that of SUS430 alloy under long-term running.