A Study on Effect of Reactive and Rare Earth Element Additions on the Oxidation Behavior of Mo–Si–B System
A Study on Effect of Reactive and Rare Earth Element Additions on the Oxidation Behavior of Mo–Si–B System
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DOI：
10.1007/s11085-013-9374-2
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发表时间：
2013-02
影响因子：
2.2
通讯作者：
S. Majumdar;S. Burk;D. Schliephake;M. Krüger;H. Christ;M. Heilmaier
中科院分区：
文献类型：
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作者：
S. Majumdar;S. Burk;D. Schliephake;M. Krüger;H. Christ;M. Heilmaier
Mo-9Si-8B-1Ti、Mo-9Si-8B-1.8Ti、Mo-9Si-8B-0.2La和Mo-9Si-8B-0.4La2O3（at.%）使用机械合金化，随后进行热等静压和场辅助烧结来制备合金。XRD、SEM和EBSD分析证实了合金中有Mo固溶体、A15和T2相的形成。在750 ~ 1，300 °C温度范围内对试样的恒温氧化行为进行了长达100 h的研究。含Ti和La的合金在900 °C下在氧化的初始阶段都显示出比非合金化的Mo-Si-B上级的氧化行为。添加Ti的合金在较高温度（1，000 - 1，300 °C）下由于形成非保护性的低粘度SiO2-TiO 2-B2 O3氧化皮而遭受较高的重量损失速率。La合金化Mo-Si-B在中温（900 °C）和高温下均表现出优异的上级抗氧化性。La在氧化物/合金界面的富集是La合金化Mo-Si-B氧化行为改善的原因。在所研究的四种材料中，含La 2 O3的合金在900 °C下显示出最好的抗氧化性。
Mo–9Si–8B–1Ti, Mo–9Si–8B–1.8Ti, Mo–9Si–8B–0.2La and Mo–9Si–8B–0.4La2O3(at.%) alloys were prepared using mechanical alloying followed by hot isostatic pressing and field assisted sintering. XRD, SEM and EBSD analysis confirmed the formation of Mo solid solution, A15 and T2 phases in the alloys. Isothermal oxidation behavior of the specimens was studied in the temperature range from 750 to 1,300 °C for up to 100 h. Both the Ti and La containing alloys showed superior oxidation behavior compared to unalloyed Mo–Si–B at 900 °C at the initial periods of oxidation. Ti-added alloys suffered higher rate of weight loss at higher temperatures (1,000–1,300 °C) due to the formation of non-protective low viscosity SiO2-TiO2-B2O3scale. La-alloyed Mo–Si–B showed superior oxidation resistance at intermediate temperatures (900 °C) as well as at higher temperatures. Enrichment of La at the oxide/alloy interface was found to be the reason for improved oxidation behavior of La-alloyed Mo–Si–B. Amongst the four materials studied, the La2O3containing alloy showed the best oxidation resistance at 900 °C.