粉末包埋法制备镍基高温合金Y-Cr-Al涂层高温氧化行为

High temperature oxidation behavior of Y-Cr-Al coatings on Ni-based superalloy by pack cementation

摘要:

本研究在不同的Al含量的条件下应用粉末包埋法制备了Y-Cr-Al涂层，并对其高温氧化行为进行了研究。结果显示：Al含量为2%所生成的涂层为三层结构，Al含量为2.5%，3%所形成的涂层为两层结构。Al含量为2%，3%的条件下涂层主要以α-Cr ，NiAl为主，Al含量为2.5%时生成的涂层富含Cr的NiAl相，许多Cr原子固溶于NiAl相中。Al含量为2%所生成的涂层氧化性能最差，Al含量为2.5%所生成的涂层展现了较为优异的氧化性能。

Abstract:

The oxidation behaviors of Y-Cr-Al coatings by pack cementation process with different Al content were investigated. The results show that the coating with 2% Al content in the pack has a three-layer structure, while the coatings with 2.5% and 3% Al content have two layers. And the main phases in the coating with 2% and 3% Al content are α-Cr and NiAl, respectively. But the main phases in coating with 2.5% Al content is NiAl with several Cr-rich particles and solid solution Cr atoms in the coating. The oxidation test demonstrates that the coated specimen with 2% Al content has the poorest oxidation resistance, but the one with 2.5% Al content has a favorable oxidation resistance.