【摘要】 在Ｍ３８Ｇ镍基合金基体上制成了Ａｌ－Ｚｒ－Ｙ三元共渗涂层．对比研究了带有Ａｌ－Ｚｒ－Ｙ涂层、单渗铝涂层及不带涂层的Ｍ３８Ｇ合金，于１１２３Ｋ、应力为３６０ＭＰａ时，在空气中和表面涂盐（７５％Ｎａ２ＳＯ４＋２５％ＮａＣｌ，６．０ｍｇ／ｃｍ２）条件下的高温腐蚀与高温蠕变行为．研究结果表明，在表面涂盐热腐蚀条件下，带涂层试样的高温蠕变寿命明显增长，尤以带Ａｌ－Ｚｒ－Ｙ三元共渗涂层者为优，文中还讨论了活性元素锆和稀土元素钇的作用机理．更多还原

【Abstract】 Abstract Ternary Al-Zr-Y coating was successfully obtained on M38G superalloy by means of thermit process at 1173K. Its corrosion and creep behavior was investigated, and was compared with that of uncoated M38G alloy and that of M38G with aluminide coating under stress of 360 MPa in air at 1123K in the Presence or absence of a Na2SO4-NaCl salt deposit on specimen surface. The results showed that in the hot corrosion condition, the creep life of M38G with the ternary coating and M38G with aluminide coating were 187-214h and 155-170h, and the creep rate at the second stage were 1.04×10-4h-l and1.25×10-4h-1, respectively. The creep resistance of the tertiary coating was better than that of aluminide coating. The beneficial effect of Zr and Y on hot corrosion resistance and creep property at high temperatures is explained. As reactive elements, Zr and Y are belived to promote the diffusion and selective oxidation of Al, Cr and Ti, resulting in the formation of a protective oxide film on the coating surface and a continuous Cr and Ti-rich alloy layer at the coating/substrate interface. As denaturants,Zr and Y are considered to modify the grain boundaries of the ternary coating to such an extent that the cohesion of grain boundaries, or the intergranular strength, is enhanced更多还原