Abstract Dy-Si-modified aluminide coating was deposited onto new γ′-strengthened cobalt-based superalloy by pack cementation technology. The coating is composed of an outer layer and a diffusion zone in thickness of around 70 μm and 11 μm, respectively. The outer layer consists mainly of AlCo containing Al5Co2 dispersoids. The weight gain of Al-Si-Dy coating after hot corrosion at 1173 K for 100 h is 0.36 mg/cm2. Al-Si-Dy coating shows better corrosion resistance by contrast with Al and Al-Si coating. The hot corrosion mechanisms of Al-Si-Dy coating is discussed in this study.

中文翻译：

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Al-Si-Dy涂层在新型γ′强化钴基合金上的热腐蚀行为

摘要 采用填充渗碳技术在新型γ′强化钴基高温合金上沉积了Dy-Si改性铝化物涂层。涂层由外层和扩散区组成，厚度分别约为 70 μm 和 11 μm。外层主要由含有 Al5Co2 分散体的 AlCo 组成。在 1173 K 下热腐蚀 100 小时后，Al-Si-Dy 涂层的重量增加为 0.36 mg/cm2。与Al和Al-Si涂层相比，Al-Si-Dy涂层显示出更好的耐腐蚀性。本研究讨论了 Al-Si-Dy 涂层的热腐蚀机制。