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通过1080℃下Si-Y扩散共渗5h的方法在TiAlNb9合金表面制备了Si-Y共渗层,采用SEM、EDS和XRD分析了共渗层组织结构,对比研究TiAlNb9和Si-Y共渗层与GCr15球对摩时的摩擦磨损行为.结果表明:Si-Y共渗层厚约33μm,组织均匀、致密,共渗层的外层主要为(Ti,Nb)Si2相,中间层分为上下两层,分别为(Ti,Nb)5Si4相和(Ti,Nb)5Si3相,内层为γ-TiAl相;在试验条件下,Si-Y共渗处理可显著提高TiAlNb9合金的抗摩擦磨损性能,TiAlNb9合金的磨损机理为犁削磨损和磨粒磨损,而Si-Y共渗层表面由于较高的硬度未发生明显磨损.
The Si-Y co-diffusion layer was prepared on the surface of TiAlNb9 alloy by Si-Y diffusion-diffusion at 1080 ℃ for 5h. The microstructure of the co-diffusion layer was analyzed by SEM, EDS and XRD. The TiAlNb9 and Si-Y co- The results show that the Si-Y co-diffusion layer has a thickness of about 33μm, the structure is uniform and compact, and the outer layer of the co-diffusion layer is mainly composed of (Ti, Nb) Si2 phase. The middle layer is divided into upper and lower layers Two layers of (Ti, Nb) 5Si4 phase and (Ti, Nb) 5Si3 phase and the inner layer of γ-TiAl phase. Under the experimental conditions, the Si-Y co-infiltration treatment can significantly improve the anti-friction and wear properties of TiAlNb9 alloy , The wear mechanism of TiAlNb9 alloy is plow abrasion and abrasive wear, while the surface of Si-Y co-diffusion layer does not obviously wear due to higher hardness.