Effects of Wet Air and Synthetic Combustion Gas Atmospheres on the Oxidation Behavior of Mo-Si-B-Alloys.

Kramer, M. J. ; Thom, A. J. ; Mandal, P.

Technical Information Center Oak Ridge Tennessee

关键词: Alloys;    Combustion;    Oxidation;    Flue gas;    Corrosion;   

RP-ID  :  DE2005835686

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Continuing our work on understanding the oxidation behavior of multiphase composite alloys based on the Mo-Si-B system, we investigated three alloys in the Mo-Si-B system, designated as A1, A2, and A3. The nominal phase assemblages of these alloys are: A1 = Mo(sub 5)Si(sub 3)B(sub x) (T1)-MoSi(sub 2)-MoB, A2 = T1-Mo(sub 5)SiB(sub 2) (T2)-Mo(sub 3)Si, and A3 = Mo-T2-Mo(sub 3)Si. Our previous work showed that for exposures to 1100 C, all alloys formed a protective oxide scale in dry air. Exposures to wet air containing about 150 Torr water promoted the formation of a multiphase layer near the scale/alloy interface composed of Mo and MoO(sub 2). Interrupted mass loss measurements indicated a near zero mass change. In the present study, isothermal mass measurements were conducted in order to quantitatively determine the oxidation rate constants at 1000 C in both dry and wet air.