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采用扩散共渗方法在Nb-Ti-Si-Cr基超高温合金表面制备Zr-Y改性的硅化物渗层,对比研究基体合金和共渗层在室温和800°C与SiC球对磨时的摩擦磨损性能。所制备的Zr-Y改性硅化物渗层主要由较厚的(Nb,X)Si_2外层和较薄的(Ti,Nb)_5Si_4内层组成。共渗层的显微硬度明显高于基体合金。基体合金和共渗层在常温和800°C时的磨损率均随摩擦载荷的增加而增加,但在相同的摩擦条件下,共渗层的磨损率明显低于基体合金。Zr-Y改性硅化物渗层在室温和800°C时的磨损抗力均优于基体合金,能够为基体合金提供良好的保护。
The diffusion-infiltration method was used to prepare the Zr-Y modified silicide layer on the surface of Nb-Ti-Si-Cr-based superalloy. The comparison between the base alloy and the common diffusion layer was carried out at room temperature and 800 ° C The friction and wear properties. The prepared Zr-Y modified silicide layer is mainly composed of a thick (Nb, X) Si 2 outer layer and a thinner (Ti, Nb) 5 Si 4 inner layer. The microhardness of the common layer is obviously higher than that of the matrix alloy. The wear rate of the matrix alloy and the common diffusion layer increases with the increase of the frictional load at normal temperature and 800 ° C, but the wear rate of the common diffusion layer is obviously lower than that of the base alloy under the same friction condition. The wear resistance of the Zr-Y modified silicide layer is better than that of the matrix alloy at room temperature and 800 ° C, which can provide good protection for the matrix alloy.