Effect of Ti (Macro-) Alloying on the High-Temperature Oxidation Behavior of Ternary Mo-Si-B Alloys at 820-1,300 A°C
Effect of Ti (Macro-) Alloying on the High-Temperature Oxidation Behavior of Ternary Mo-Si-B Alloys at 820-1,300 A°C
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DOI：
10.1007/s11085-013-9375-1
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发表时间：
2013-10-01
影响因子：
2.2
通讯作者：
Bolivar, Peter Haring
中科院分区：
文献类型：
--
作者：
Azim, Maria Azimovna;Burk, Steffen;Bolivar, Peter Haring
本研究的目的是初步了解在 820-1,300 A 摄氏度下，Ti（宏观）合金化对 Mo_ss-Mo3Si-Mo5SiB2 三元相区 Mo-Si-B 合金氧化行为的影响。在最近的研究和热力学计算的推动下，合金成分 Mo-9Si-8B-29Ti (at.%) 和选择Mo-12.5Si-8.5B-27.5Ti (at.%)，采用电弧熔炼法合成。与参考合金 Mo-9Si-8B 相比，在 1,100-1,300 A 摄氏度下观察到优异的初始氧化速率，并且密度显着降低了近 18%。由于 MoO3 初始蒸发增强以及氧主要向内扩散，形成了具有连续 TiO2 相的硼硅酸盐-金红石双相垢。通过SEM、EDX、XRD和共焦显微拉曼光谱对氧化机理的详细研究表明，Ti合金化有望进一步提高Mo-Si-B合金的抗氧化性和强度重量比。
The aim of the present investigation was to gain an initial understanding of the effect of (macro-) alloying with Ti on the oxidation behavior of Mo-Si-B alloys in the ternary phase region of Mo_ss-Mo3Si-Mo5SiB2 at 820-1,300 A degrees C. Motivated by recent studies and thermodynamic calculations, the alloy compositions Mo-9Si-8B-29Ti (at.%) and Mo-12.5Si-8.5B-27.5Ti (at.%) were selected and synthesized by arc-melting. Compared to the reference alloy Mo-9Si-8B, superior initial oxidation rates at 1,100-1,300 A degrees C as well as a significant density reduction by nearly 18 % were observed. Due to enhanced initial evaporation of MoO3 and mainly inward diffusion of oxygen, a borosilicate-rutile duplex scale with a continuous TiO2 phase had formed. Detailed investigations of the oxidation mechanism by SEM, EDX, XRD and confocal micro-Raman spectroscopy indicated that Ti alloying is promising with regard to further improvement of the oxidation resistance as well as the strength-to-weight ratio of Mo-Si-B alloys.