钛合金叶尖保护涂层的制备与表征

Preparation and characterization of titanium alloy protective coating and its application

摘要:

通过对TC4钛合金基体进行表面活化处理,并采用复合电镀技术,在钛合金基体上成功实现了镀覆结合力良好的Ni-cBN复合镀层。研制的复合镀层能够减少航空发动机钛合金叶片叶尖生的摩擦磨损、杜绝“钛火”事故。通过镀层的高温摩擦磨损试验以及与镍基封严涂层的磨削试验,结合扫描电子显微镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)等性能表征,结果证明：本文采用的钛合金基体表面活化处理技术,可保证复合镀层具有良好的结合力；同时,研制的Ni- cBN复合镀层对封严涂层具有良好的磨削能力和较低的摩擦系数,可以有效防护钛合金叶尖。

Abstract:

Aimed at the problem of friction and wear of titanium alloy blade in aero-engine compressor, in this paper, we use a technology of composite electroplating combining with the surface activation of the titanium alloy processing, a Ni-cBN composite coating on Ti-6Al-4V(TC4) substrate was successfully prepared with improved bonding strength. The friction and wear properties of the coating with the Ni-based abradable seal coating were studied with high temperature friction and wear test,and the results were compared with the TC4 rub with Ni-based abradable seal coating coating. The experimental results were characterized by scanning electron microscopy (SEM), X-ray diffraction(XRD), X-ray photoelectron spectroscopy (XPS). The results shown that a well bonded composite coating on the TC4 substrate was obtained after surface activation treatment of titanium alloy matrix. The deposited Ni-cBN composite coating exhibits a very strong grinding ability and low friction coefficient, which provids protection to the titanium alloy tips.