摘要
磁控溅射Co—Cr—Al(Y)纳米涂层在1000,1100和1200℃氧化一定时间后,用光激发荧光谱技术表征热生长的Al2O3相.发现氧化层局部区域存在由非稳态相向稳态相的转变,即: γ→θ→α;其转变过程随温度升高显著加快,并在1200℃下变得不明显.在相同温度下,Y明显减缓Al2O3相转变过程.
Thermally-grown alumina formed at 1000, 1100 and 1200 癈 on magnetron-sputtered Co-Cr-Al nanocoatings with and without yttrium additions has been characterized using photo-stimulated luminescence spectroscopy (PSLS). The measurements on some locations provided a scenario in relation to time-dependent evolution of the luminescence spectrum, which revealed a two-stage phase transformation of alumina, from metastable 7, 0 phases to stable a: phase. The transient time was shortened with increasing temperature and can almost not be characterized at 1200℃. PSLS analysis also demonstrated that yttrium appears to play a role in slowing down the phase trasformation.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第10期1055-1059,共5页
Acta Metallurgica Sinica
基金
中国科学院"引进海外杰出人才"资助项目
