EFFECT of TEMPERAUTRE on PACK SILICONIZING of Ti6Al4V ALLOY
Abstract
This study aims to investigate the temperature effects on silicide coating formed by pack siliconizing method on Ti6Al4V subsrate. Pack siliconizing process was conducted out for 2h at 1000°C, 1100°C, 1200°C, in vacum atmosphere, by using Si as Si source, Al2O3 powder as filler and NH4Cl as an activator. The presence of the formed phases such as Ti5Si3, TiSi, TiSi2 on coating, and non-stoichiometric Al203 compound from the pack mixture was actualized by X-ray diffraction analysis (XRD). It was obeserved that the silicide coating on Ti6Al4V substrate is compact, dense and the coating thickness varies between 10.5-30.4 μm depending on the treatment temperature. The morphological feautres of the coating and dispersion of the elements in the silicide layer was examined by using electron microscope (SEM) and elemental analysis (EDS). Hardness of silicide layer measured by Vickers method and determined that the hardness ranges between 1170 Hv0,025 to 1450 HV 0,025 .
Keywords
Pack cementation, pack siliconizing, diffusion coating, Ti6Al4V, silicide coating
Project Number
2021-50-01-063
References
- [1] M. Jackson, R.R. Boyer, Titanium and its Alloys: Processing, Fabrication and Mechanical Performance, Encycl. Aerosp. Eng. (2010) 1–16. https://doi.org/10.1002/9780470686652.eae199.
- [2] R. Boyer, G. Welsch, E.W. Collings, Materials properties handbook : titanium alloys, 1994.
- [3] K. Chou, P.W. Chu, E.A. Marquis, Early oxidation behavior of Si-coated titanium, Corros. Sci. 140 (2018) 297–306. https://doi.org/10.1016/j.corsci.2018.05.035.
- [4] M. Hetmańczyk, L. Swadźba, B. Mendala, Advanced materials and protective coatings in aero-engines application co-operating with Manufacturing and processing, 2007. www.journalamme.org.
- [5] F.J. Pérez, M.P. Hierro, M.C. Carpintero, F.J. Bolivar, Aluminum and silicon co-deposition by the chemical vapor deposition in fluidized bed reactor technique as a precursor of protective coatings of mullite, Surf. Coatings Technol. 184 (2004) 361–369. https://doi.org/10.1016/j.surfcoat.2003.11.001.
- [6] R. Bianco, R.A. Rapp, Pack cementation diffusion coatings, Metall. Ceram. Prot. Coatings. (1996) 236–260. https://doi.org/10.1007/978-94-009-1501-5_9.
- [7] T.R. Rautray, R. Narayanan, T. Kwon, K. Kim, Surface Modification of Titanium and Titanium Alloys by Ion Implantation Review Surface Modification of Titanium and Titanium Alloys by Ion Implantation, (2010). https://doi.org/10.1002/jbm.b.31596.
- [8] A.R. Castle, D.R. Gabe, Chromium diffusion coatings The application of diffusion coatings has become, 1999.
- [9] W. Yang, J. Park, K. Choi, C.H. Chung, J. Lee, J. Zhu, F. Zhang, J.S. Park, Evaluation of growth kinetics of aluminide coating layers on Ti-6Al-4V alloys by pack cementation and the oxidation behaviours of the coated Ti-6Al-4V alloys, Int. J. Refract. Met. Hard Mater. 101 (2021) 105642. https://doi.org/10.1016/j.ijrmhm.2021.105642.
- [10] D. Vojtěch, B. Bártová, T. Kubatík, High temperature oxidation of titanium-silicon alloys, Mater. Sci. Eng. A. 361 (2003) 50–57. https://doi.org/10.1016/S0921-5093(03)00564-1.