Preparation and characterization of titanium alloy protective coating and its application

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.