Quantitative Evaluation of (0001) Sapphire Recession in High-Temperature High-Velocity Steamjet Exposures

Quantitative Evaluation of (0001) Sapphire Recession in High-Temperature High-Velocity Steamjet Exposures
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高温高速蒸汽喷射暴露中 (0001) 蓝宝石凹陷的定量评估

DOI:
10.1016/j.jeurceramsoc.2021.07.064
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发表时间:
2021
影响因子:
5.7
通讯作者:
Opila, Elizabeth J.
Opila, Elizabeth J.
中科院分区:
材料科学1区
文献类型:
--
作者:
Ridley, Mackenzie J.;Opila, Elizabeth J.

文献摘要

参考文献

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在1200 °C-1450 °C的温度下进行(0001)蓝宝石试样的高温高速蒸汽暴露,以确定蒸汽喷射装置的定量能力。衰退的结果进行了比较,计算值的Al(OH)3(g)的传质速率的基础上层流模型和现有的热力学数据Al(OH)3(g)。线性材料的挥发率和强烈的气体速度依赖于反应深度证实了Al 2 O3反应是由气相扩散过程控制。水蒸汽反应的温度依赖性与热力学计算和文献一致,证实Al(OH)3(g)通过气体边界层的运输是水蒸汽中Al 2 O3挥发的限速步骤。因此,蒸汽喷射实验装置可用于确定已知蒸汽流量条件下的蒸汽氧化物反应热力学。蒸汽喷射测试衰退结果简单的氧化物进行了讨论,形成多孔产品层,这是尚未得到很好的理解的复杂氧化物的行为进行比较。
High-temperature high-velocity steam exposures of (0001) sapphire coupons were performed at temperatures of 1200 °C–1450 °C to determine the quantitative capability of the steamjet apparatus. Recession results were compared to calculated values of Al(OH)3(g) mass transfer rates based on laminar flow models and available thermodynamic data for Al(OH)3(g). Linear material volatilization rates and a strong gas velocity dependence on the reaction depth confirmed that the Al2O3reaction was controlled by a gas-phase diffusion process. The temperature dependence for the steam reaction agreed with thermodynamic calculations and with the literature, confirming that Al(OH)3(g) transport through a gas boundary layer represents the rate-limiting step for Al2O3volatilization in steam. The steamjet experimental setup can thus be utilized for determination of steam-oxide reaction thermodynamics given known steam flow conditions. Steamjet test recession results for simple oxides are discussed for comparison with behavior of complex oxides that form porous product layers, which are not yet well understood.
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DOI: --
发表时间: 2021
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