Influence of Vanadium on the Oxidation Resistance of the Intermetallic Phase Nb5Si3
Influence of Vanadium on the Oxidation Resistance of the Intermetallic Phase Nb5Si3
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DOI：
10.1007/s11085-014-9510-7
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发表时间：
2015-02
影响因子：
2.2
通讯作者：
F. Gang;K. Klinski-Wetzel;J. N. Wagner;M. Heilmaier
中科院分区：
文献类型：
--
作者：
F. Gang;K. Klinski-Wetzel;J. N. Wagner;M. Heilmaier
研究了添加钒对Nb5Si3金属间相抗氧化性的影响。通过使用场辅助烧结技术压实机械合金化粉末来生产样品。在800、1000和1200 °C的等温条件下进行氧化实验，氧化时间长达100小时。线性氧化速率常数被发现在所有温度下测试和氧化皮形态的影响进行了讨论。在800 °C下获得非常有希望的低增重，并且使用扫描电子显微镜、电子色散光谱和X射线衍射分析彻底检查该特定氧化物垢以确定形成的氧化物相。从相图中可以看出，氧化皮的主相为V2O5·9Nb2O5混合氧化物。没有观察到这种混合氧化物的溅射，这可能是由于与纯Nb2O5相比其较低的体积增益。与较慢的形成动力学一起，所使用的量的钒的添加似乎积极地改变Nb5Si3的氧化行为。
The influence of vanadium additions on the oxidation resistance of the intermetallic phase Nb5Si3was examined. Samples were produced by compacting mechanically alloyed powders using the field-assisted sintering technique. Oxidation experiments were performed under isothermal conditions at 800, 1000 and 1200 °C for oxidation times up to 100 h. Linear oxidation rate constants were found for all temperatures tested and the influence of the oxide scale morphology is discussed. At 800 °C very promising low weight gains were obtained and this particular oxide scale was examined thoroughly using scanning electron microscopy, electron dispersive spectroscopy and X-ray diffraction analysis to determine the oxide phases formed. As expected from the phase diagram the mixed oxide V2O5·9Nb2O5was found as the major phase constituting the scale. No spallation of this mixed oxide was observed which is likely due to its lower volume gain as compared to pure Nb2O5. Together with the slower formation kinetics, Vanadium addition in the amount used seems to positively alter the oxidation behaviour of Nb5Si3.