Ti含量对镍基高温合金抗热腐蚀性能的影响

Effect of Ti Content on Hot Corrosion Resistance of Nickel-Base Superalloy

摘要:

采用涂盐方法研究了不同Ti含量的镍基高温合金的热腐蚀过程。研究发现，在900 ℃涂盐条件下，Ni基高温合金中加入质量分数为0.55%的Ti就可以显著提高合金自身的热腐蚀抗力，并且随着Ti含量增加，合金的热腐蚀抗力进一步增强。研究认为，合金中加入Ti后，能促使合金表层形成致密、连续的Cr2O3层，并且随着Ti含量增加，Cr2O3层厚度增加，Al2O3层逐渐向外腐蚀层迁移，从而提高了合金的热腐蚀抗力。

Abstract:

The hot corrosion process of nickel-base superalloy with different Ti content by coating with salt membrane was studied. The results show that the hot corrosion resistance of the superalloy increases greatly under the experimental condition of 900 °C after adding 0.55% Ti. Its hot corrosion resistance becomes better with the increasing of Ti content. Continuous and compact Cr2O3 layer can be formed on the surface of the superalloy by adding titanium. Thickness of Cr2O3 layer increases and Al2O3 layer transfers outward with more Ti, so that the hot corrosion resistance of the alloy increases.