作　　者： ; ; ; ; ;

机构地区： 中南大学材料科学与工程学院粉末冶金国家重点实验室

出　　处： 《Transactions of Nonferrous Metals Society of China》 2011年第12期2617-2625,共9页

摘　　要： 研究Ni-16Cr-xAl(x=4.5%,6.8%,9.0%)合金在600°CNa2SO4-NaCl混合盐中的热腐蚀行为,分析预氧化及铝含量对合金抗热腐蚀行为的影响。结果表明,随着铝含量由4.5%增加到9.0%(质量分数),Ni-16Cr-xAl(x=4.5%,6.8%,9.0%)合金在Na2SO4-NaCl混合盐中的抗热腐蚀性能提高。因为β-NiAl相的存在能修复热腐蚀中被破坏的Al2O3膜,所以Ni-16Cr-9.0Al合金表现出最优异的抗热腐蚀性能。在预氧化后的样品表面形成了一层具有保护性的氧化膜,其抗热腐蚀性能优于原始态样品的。 The hot corrosion behaviors of Ni–16Cr–xAl（x=4.5%, 6.8%, 9.0%, mass fraction） based alloys in Na2SO4–25% NaCl molten salts at 600 °C were investigated. The effects of pre-oxidation and Al content on the resistance to hot corrosion were examined. The hot corrosion resistance of Ni–16Cr–xAl based alloy with Al addition from 4.5% to 9.0% increases with increasing Al content. The alloy with Al content of 9.0% shows the highest hot corrosion resistance among the examined alloys because more β–NiAl phases are obtained to sustain the Al2O3 scale repaired during hot corrosion. Pre-oxidized specimens have a superior hot corrosion resistance compared with the as-cast specimens, due to a protective oxide scale formed after pre-treatment.

关 键 词： 合金 预氧化 混合盐 热腐蚀机理

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]