分散剂Y2O3对渗铝层的影响

通过改变传统渗剂来研究分散剂（Al2O3，Y2O3）在渗铝过程中的作用和对渗铝层的影响。利用XRD和SEM对渗层相的组成、氧化前后表面形貌进行分析。结果表明：分散剂Y2O3在最初的渗铝过程中参加了渗铝过程，不仅防止铝粉粘结，而且影响渗层相的组成。分散剂为Al2O3时，渗层主要为Al3Ti＋AlTi＋AlTi3相，而分散剂中含有Y2O3时，渗层土要为AlTi3相，这与传统渗铝机理认为分散剂在渗铝过程中不参加渗铝反应相矛盾。同时，分散剂也影响着渗铝层氧化前后的表面形貌及Al2O3的晶格类型。

Effect of Pack Aluminizing Filler Y2O3 on Aluminide Coatings

The effect of pack aluminizing fillers (Al2O3, Y2O3) on the aluminide coatings are studied by changing the traditional pack aluminizing. The phases and the surface morphologies of aluminide coatings before and after oxidation are examined by XRD and SEM. The results show that the pack aluminizing fillers take part in the aluminizing process, which does not only keep the Al power from sintering, but also affect the phases in the aluminide coatings. The aluminide coatings with the pack aluminizing fillers (Al2O3) are mainly composed of Al3Ti + AlTi + AlTi3 phase, but mainly of AlTi3 phase when the pack aluminizing fillers contain Y2O3, which conflicts with the traditional mechanism of pack aluminizing. The pack aluminizing fillers also have much effect on the surface morphologies of aluminide coatings before and after oxidation and the style of Al2O3 crystal lattice.