利用TGA, SEM/EDS研究Ag含量对β-NiAl合金高温氧化时生成Al2O3膜表面形貌的影响及添加1%Ag（原子分数）对1000 oC氧化动力学的影响。研究结果表明， β-NiAl合金的氧化动力学由两段抛物线组成，分别受亚稳Al2O3和稳态α-Al2O3的生长控制。NiAl-1Ag合金的氧化动力学由三段抛物线组成，分别受γ-Al2O3，θ-Al2O3和α-Al2O3的生长控制。1000 oC时，向β-NiAl中添加少量的Ag(<1%)可以促进亚稳Al2O3向稳态α-Al2O3的转变。当添加量超过5%时，促进作用不明显。1100 oC时, 添加0.5%Ag对β-NiAl氧化时表面Al2O3的相变无明显的促进作用。
The effect of adding small amounts of Ag to β-NiAl on surface morphology of alumina scale during the oxidation at 1000-1100oC and the oxidation kinetics of β-NiAl and NiAl-1Ag were investigated by TGA and SEM/EDS. The kinetics of β-NiAl presents two parabolic stages controlled by the growth of metastable alumina and stable α-Al2O3, respectively, while those of NiAl-1Ag are composed of three different parabolic stages controlled by the growth of γ-Al2O3, θ-Al2O3 and α-Al2O3, respectively. The additions of small amounts of Ag to β-NiAl favors the phase transformation from metastable alumina to α-Al2O3, while this effect disappears for an Ag content above 5% at 1000oC. Finally, the addition of 0.5% Ag to β-NiAl does not affect the surface morphology of Al2O3 at 1100oC.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] |
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