利用带蒸汽发生器的同步热分析仪对Fe22Cr5Al3Mo-x Y (x=0、0.15,质量分数,%)合金分别进行1000和1200℃下恒温2 h的高温蒸汽氧化实验。采用XRD、FIB、EDS和TEM观察分析氧化前后样品的显微组织、晶体结构和成分。结果表明,添加0.15%Y使Fe...利用带蒸汽发生器的同步热分析仪对Fe22Cr5Al3Mo-x Y (x=0、0.15,质量分数,%)合金分别进行1000和1200℃下恒温2 h的高温蒸汽氧化实验。采用XRD、FIB、EDS和TEM观察分析氧化前后样品的显微组织、晶体结构和成分。结果表明,添加0.15%Y使FeCrAl合金在1000℃下的氧化增重速率增大,但可降低FeCrAl合金在1200℃下的氧化增重速率,同时还可以抑制氧化膜表面脊状形貌的形成,并提高了合金氧化膜的厚度均匀性以及界面平整度;2种合金在1000和1200℃的高温蒸汽下恒温2 h后形成的氧化物膜均为α-Al_(2)O_(3),在Al_(2)O_(3)膜中平行于氧化膜/基体(O/M)界面的Fe、Cr富集区为hcp-(Cr,Fe)_(2)O_(3);Fe22Cr5Al3Mo-0.15Y合金在1200℃下恒温2 h后氧化膜中朝向基体一侧生长的富Y氧化物中存在AlYO_(3)、Y_(2)O_(3)和Fe(Cr,Al)_(2)O_(4)尖晶石氧化物。从Y影响氧化膜显微组织演化的角度探讨了Y对不同温度下FeCrAl合金氧化行为的影响机制。展开更多
A lot of liquid-gas and liquid-gas-solid inclusions were found in Pharkant jadeitites, northwestern Myanmar and their characteristics, geological setting and porphyroclastic jadeites with inclusions in them were descr...A lot of liquid-gas and liquid-gas-solid inclusions were found in Pharkant jadeitites, northwestern Myanmar and their characteristics, geological setting and porphyroclastic jadeites with inclusions in them were described in detail. The results analyzed by Raman spectrometer showed that the component of liquid-gas phase and solid phase (daughter minerals) in fluid inclusions is H2O + CH4 and jadeite separately. The results indicated that Pharkant jadeitites were crystallized from H2O + CH4 bearing jadeitic melt which may originate from mantle. The P-T conditions in which the jadeitites were crystallized were speculated to be T】650℃, P】1.5 GPa.展开更多
文摘A lot of liquid-gas and liquid-gas-solid inclusions were found in Pharkant jadeitites, northwestern Myanmar and their characteristics, geological setting and porphyroclastic jadeites with inclusions in them were described in detail. The results analyzed by Raman spectrometer showed that the component of liquid-gas phase and solid phase (daughter minerals) in fluid inclusions is H2O + CH4 and jadeite separately. The results indicated that Pharkant jadeitites were crystallized from H2O + CH4 bearing jadeitic melt which may originate from mantle. The P-T conditions in which the jadeitites were crystallized were speculated to be T】650℃, P】1.5 GPa.
