Synthesis And Characterization Of (Cr_1-XTi_X)N Coating On 1Cr10Co3MoWVNbNB Heat-resistant Steel Surface

It used Closed-field unbalanced magnetron sputtering to prepare the (Crl-XTiX)N hard thin flims with different content of Ti on the surface of 1Cr10Co3MoWVNbNB stainless steel by adjusting the power of titanium target to enhance the service life and operational performance of the steam turbine's leaf blade.It observed the film's appearance and analized its ingredient using scanning electronic microscope with EDS.Besides, it carried on analysis to phase structure of thin film with XRD.Film thickness was determined by ball grinding law. Hardness and elasticity coefficient were got by the nanometer hardness indentation method. Binding force of the thin film was got by Pull-off method. Simultaneously it decided the friction and wear behavior of coating and observed surface topography using the pin-on-disc testing machine.It carried the high-temperature oxidation experiment to thin film test specimen at 700℃with different craft preparation and it analized the thin film phase structure and the surface condition after oxidizing using XRD, EDS,SEM,and so on.The results show that:the Ti content of coatings rises with the increasing Ti target power, the phase constitution of coatings transforms from (CrTi) N base on CrN phase to a mixed phase of CrN and TiN, and crystallization of coatings increases. Besides, the surface quality of coatings is well and the particle size of coating surface shows an increasing trend with the increase of Ti content. The coating thickness increases with the rise of Ti content in a certain range of 2.01 and 3.54 micron. The hardness value reaches ultimate value (23.38GPa) when X equal to 0.39, and the hardness value from the matrix to coatings transits smoothly. The wear resistance of matrix can be improved by means of different preparation process of coatings, which can protect the matrix. Coatings can protect the matrix effectively at 700℃, while the matrix without coatings is gravely oxidized producing the iron oxide after 2 hours; oxide particles of coating surface of A and D specimens have a small size and a low O content after oxidation for 20 hours; the oxide film integrity is not destroyed with the introduction of Ti, the particle of coating surface grows up because of the preferred orientation growth of TiO2, and the oxide film still has ability to protect the matrix for no breakage and peeling-off of the oxide film.