Al-Cu-Si基合金储热材料的高温抗氧化性

High Temperature Oxidation Resistance of Al-Cu-Si Based Alloy Heat Storage Material

采用制备的Al-30Cu-5Si合金进行氧化实验,利用X射线衍射、扫描电镜、能谱仪研究了该合金在600℃下不同时间段的氧化规律,通过分析氧化后合金的质量以及基体表面的物相和形貌变化,得出氧化机理;并对该合金的氧化速率和氧化率进行了拟合。结果表明:Al-30Cu-5Si合金的氧化速率随时间的增加而减慢,氧化率逐渐增加。经96 h氧化,Al-30Cu-5Si合金氧化速率从24h氧化的1.54×10^(-5) g·cm^(-2)·h^(-1)降到0.61×10^(-5)g·cm^(-2)·h^(-1),氧化率从0.046%增加到0.075%。在氧化过程中,Al与O形成Al_(2)O_(3),然后随着氧化的继续进行,基体表面会生成CuO。基体表面Al2O3的含量远多于CuO,Si未与O发生反应。

The oxidation experiment of the prepared Al-30 Cu-5 Si alloy was carried out. The oxidation regularity of the alloy at 600 ℃ for different time periods was studied by X-ray diffraction, scanning electron microscopy and spectroscopy.The oxidation mechanism was obtained by analyzing the mass of the alloy after oxidation and the phase and morphology changes on the surface of the matrix after oxidation. The oxidation rate and oxidation ratio of the alloy were fitted. The results show that the oxidation rate of Al-30 Cu-5 Si alloy decreases with the time increasing and the oxidation ratio increases. After 96 h oxidation, the oxidation rate of the alloy decreases from 1.54×10^(-5 )g·cm^(-2)·h^(-1) of 24h oxidation to 0.611.54×10^(-5) g·cm^(-2)·h^(-1),while the oxidation ratio increases from 0.046% to 0.075%. During the oxidation process, Al and O form Al2 O3, followed by CuO formation on the surface of the matrix as the oxidation proceeds. The content of Al_(2) O_(3) on the surface of the matrix is far more than that of CuO, and the Si does not react with O.