高温蒸汽环境下K444和K452合金及涂层的氧化行为

张超, 何闯, 夏凯, 郭亭山, 梁志远

Oxidation Behavior of K444 and K452 Alloys with and Without Thermal Barrier Coatings in High- temperature Steam Environment

ZHANG Chao, HE Chuang, XIA Kai, GUO Tingshan, LIANG Zhiyuan

表7 1000 ℃下金属和H2O反应的Gibbs自由能(ΔG)

Table 7 Gibbs free energy (ΔG) of the reaction between metals and H2O at 1000 ℃

No. Reaction equation ΔG / kJ·mol-1 1 Ni + H2O (g) = NiO + H2 (g) 51.2 2 2Cr + 3H2O (g) = Cr2O3 + 3H2 (g) -267.6 3 Cr + 3/2O2 (g) + H2O(g) = CrO2(OH)2 (g) -308.2 4 Ti + 2H2O (g) = TiO2 + 2H2 (g) -359.9 5 2Al + 3H2O (g) = Al2O3 + 3H2 (g) -739.0