利用热重分析法、X射线衍射（XRD)及扫描电镜（SEM）等手段研究了Si元素对镍基高温合金GH3230在1100℃高温氧化过程中的作用。对氧化物的析出过程做了直观性描述。研究表明，Si元素对合金高温氧化的影响主要体现在两方面：一方面，Si元素在合金氧化过程中减缓了Mn元素的扩散，导致GH3230合金高温氧化之后氧化膜的成分出现差异，不含Si元素的合金在1100℃氧化过后合金表面的氧化膜的成分主要是MnCr2O4和Cr2O3，而含有Si元素的合金在1100℃氧化过后氧化膜的主要成分为Cr2O3；另一方面，Si元素在合金氧化前期形成SiO2，对合金的进一步氧化起到减缓作用，并且在氧化后期遏制了氧化铬的挥发。
Abstract
The high temperature oxidation behavior of GH3230 was investigated at 1100℃ in air by means of TGA, XRD and SEM. The precipitation process of oxides is visually described. The results show that: the effect of Si element on high temperature oxidation of alloy is mainly reflected in two aspects. On the one hand, Si slows down the diffusion of Mn element in the oxidation process of alloy and causes difference in the composition of oxide scale after high temperature oxidation of GH3230 alloy; the main components of the oxide scale on the surface after oxidation at 1100℃ of the alloy that exclude Si elements are MnCr2O4 and Cr2O3, and of the alloy that contain Si element are Cr2O3. On the other hand, SiO2 is formed in the early stage of the oxidation of the alloy, which plays an important role in the further oxidation of the alloy and contributes to suppress the volatilization of chromium oxide in the later stage of oxidation.
关键词
Si /
GH3230合金 /
高温氧化 /
氧化膜
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Key words
silicon /
GH3230 alloy /
high temperature oxidation /
oxide scale
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