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采用扩散共渗的方法在TC4合金表面制备了Zr增效的硅化物涂层,研究了涂层的组织形成机制和韧性。结果表明,所制备的涂层具有多层结构,由外向内分别由(Ti,X)Si_2(X代表Zr、Al和V)外层、TiSi中间层和Ti_5Si_4+Ti_5Si_3内层组成。涂层的形成主要受Si向基体合金内的扩散控制,Zr在渗包内的卤化物气相分压虽然较Si的高,但扩散速率较慢,在涂层内的含量较低。与TC4合金表面单一硅化物涂层相比,Zr增效硅化物涂层具有更优良的韧性。
The diffusion-osmosis method was used to prepare a Zr-enhanced silicide coating on the surface of TC4 alloy. The microstructure and toughness of the coating were investigated. The results show that the prepared coating has a multi-layer structure consisting of the outer layer of (Ti, X) Si_2 (X stands for Zr, Al and V), the inner layer of TiSi and the inner layer of Ti_5Si_4 + Ti_5Si_3 respectively. The formation of the coating is mainly controlled by the diffusion of Si into the matrix alloy. The vapor phase partial pressure of Zr in the infiltration is higher than that of Si, but the diffusion rate is slower and the content in the coating is lower. The Zr synergistic silicide coating has better toughness than the TC4 alloy surface single suicide coating.