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Effect of Ag on the Oxidation of beta-NiAl at 1173 to 1373K In 10~5Pa Oxygen Atmosphere

机译:Ag对10〜5Pa氧气气氛中1173至1373K氧化β-NiAl的影响

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Oxidation of two ternary NiAl-Ag alloys containing 0.5, 1 at. percent Ag, denoted as NiAl-0.5Ag and NiAl-1Ag, and Ag-free beta-NiAl was studied at 1173, 1273, and 1373K for 24 h in 10~5 Pa O_2 to study the effect of the presence of silver on the oxidation behavior of beta-NiAl by TGA, XRD, and SEM/EDAX. The NiAl-Ag alloys contain a mixture of a silver-rich phase (alpha) and a matrix of nickel-aluminide NiAl (beta). Thus, these alloys are ternary two-phase systems containing two reactive elements plus a noble metal. Under the oxygen pressure used, nickel and aluminum can form stable oxides, while silver is noble. An exclusive and adhesive external Al_2O_3 scale formed on the beta-NiAl, NiAl-0.5Ag, and NiAl-1Ag alloys after 24h oxidation in 10~Pa O_2 at 1173 and 1273K. Some voids were observed at the interface of oxide and alloy containing silver and silver free NiAl at 1373K. The oxidation kinetics of the two alloys at 1173K and 1373K is similar to that of beta-NiAl. The initial oxidation rate of NiAl-0.5Ag and NiAl-1Ag at 1373K is similar to that of beta-NiAl. After 4h oxidation at 1373K the alloys containing silver begin to show mass loss. The addition of silver does not affect significantly the oxidation behavior of the NiAl intermetallic compound in all cases, as expected, because silver is essentially present only as a second phase due to its very small solubility in beta-NiAl.
机译:氧化两种含0.5、1 at。的NiAl-Ag三元合金。在10〜5 Pa O_2中于1173、1273和1373K分别研究了百分含量的Ag(分别表示为NiAl-0.5Ag和NiAl-1Ag)和不含Ag的β-NiAl,研究了24h的时间对银的影响。 TGA,XRD和SEM / EDAX分析β-NiAl的氧化行为NiAl-Ag合金包含富银相(alpha)和铝化镍NiAl(beta)基质的混合物。因此,这些合金是包含两个反应性元素和一种贵金属的三元两相体系。在所用的氧气压力下,镍和铝可以形成稳定的氧化物,而银则是贵金属。 β-NiAl,NiAl-0.5Ag和NiAl-1Ag合金在10〜Pa O_2中于1173和1273K氧化24小时后,在Al-NiAl,NiAl-0.5Ag和NiAl-1Ag合金上形成了排他性且粘附性的外部Al_2O_3垢。在1373K处,氧化物和含银的合金与不含银的NiAl的界面处观察到一些空隙。两种合金在1173K和1373K的氧化动力学与β-NiAl相似。 NiAl-0.5Ag和NiAl-1Ag在1373K时的初始氧化速率与β-NiAl相似。在1373K氧化4小时后,含银合金开始出现质量损失。如所期望的,在所有情况下,银的添加均不会显着影响NiAl金属间化合物的氧化行为,因为银由于其在β-NiAl中的溶解度很小而实际上仅作为第二相存在。

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