摘要
刷式密封材料高温高速的工作环境要求其应具有较高的强度、耐磨性和抗氧化性能。其中，高温抗氧化性能是刷丝材料的重要性能。本文以美国现用的Ni—Cr—Al基刷丝材料Haynes214（HS214）合金为研究对象，以其使用温度700℃为实验条件进行高温抗氧化实验。结果显示，100h内的平均氧化速度为0．0075g／m2·h，表现为完全抗氧化性；氧化膜厚度为63～143／xm，氧化膜的厚度是随着氧化时间的延长而增厚。X射线衍射谱显示合金主要的氧化产物为Al2O3和Cr2O3。合金在700℃不同保温时间下的氧化膜从外到内，Al含量逐渐降低，Cr含量升高。其中，最外层A1含量在50％以上，氧化膜最外层Al2O3为主要成分，随着深入，Cr2O3所占比重逐渐加大。
Brush seal materials must have high strength, wear resistance and oxidation resistance due to their high temperature and speed working environment, whose high temperature oxidation resistance is the most important. Ni-Cr-A1 based brush seal material Haynes 214 （HS 214） alloy widely used in America was studied in this paper, high temperature oxidation resistance experiment was made under 700 ℃ of its work temperature. The average oxidation rate in 100 h is 0. 007 5 g/m2 ·h, which means the alloy has complete oxidation resistance. The thickness of oxidation film, rising with the oxidation time extending, is 63-143 μm. X-ray diffraction spectrum shows that Al2O3 and Cr2O3 are the main oxidation products. The content of A1 decreases from outside to inside of oxidation film, while Cr increases under different oxidation time of 700 ℃. Al2O3 is the major ingredient in outermost layer of oxidation film, whose Al content is more than 50%, and the proportion of Cr2O3 gradually increases from outside to inside.
出处
《金属材料研究》
2014年第2期1-5,共5页
Research on Metallic Materials
