水蒸气
扩散
材料科学
氧气
微晶
烧结
大气(单位)
腐蚀
金属
克罗米亚
氧化物
化学工程
分析化学(期刊)
无机化学
化学
冶金
热力学
环境化学
物理
有机化学
工程类
作者
Jesse P. Angle,Peter E. D. Morgan,Martha L. Mecartney
摘要
Experimental results indicate effective faster diffusion of oxygen in polycrystalline alumina when exposed to water vapor at high temperatures. α‐ Al 2 O 3 containing Ni metal particles was exposed to dry air or humid environments at 1300°C for up to 20 h. Oxidation of Ni in α‐ Al 2 O 3 to form NiAl 2 O 4 was used to determine oxygen diffusion depth from the surface. The apparent kinetic rate constant for oxygen diffusion in the presence of water vapor was 79% higher compared with that in a dry atmosphere at 1300°C (1.4 × 10 −13 m 2 /s for 0.2 atm versus 7.9 × 10 −14 m 2 /s for dry air). ( OH ) − ions are smaller and more polarizable than O 2− , which would be expected to lead to faster diffusion. This effect may impact sintering, creep, corrosion, oxidation, and the performance of thermal barrier coatings ( TBC ).
科研通智能强力驱动
Strongly Powered by AbleSci AI