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This paper presents results of research of multilayer aluminium-silicon coatings. Aluminium-silicon coatings were created on high-temperature creep resist cast iron using slurry method in air atmosphere. These coatings protect equipment against hot corrosion in carburizing atmosphere at thermal shocks conditions. Various technological parameters of coatings manufacturing were applied. Main technological parameters were: temperature and time of annealing and Al-Si ratio in the active mixture. The structure of obtained coatings is three-zonal. Phase composition of two external zones ensures protection against carburizing, but these zones are not resistant to cracking. The cracks form as a result of thermal shocks. The internal zone of the coatings situated next to substrate compensates for differences of thermal expansion of the coating and the substrate. The cracks are stopped in the internal zone and do not propagate into the substrate material. Protective efficiency of the coatings at carburizing conditions with thermal shocks was determined. Structure of the coatings before and after carburizing and thermal shocks is described in present paper. Thickness, chemical composition (EDS) and phase composition (XRD) of the coatings are determined. Correlation between the coatings structure and depth of carburized layer was determined.
Czasopismo
Rocznik
Tom
Strony
129--132
Opis fizyczny
Bibliogr. 15 poz., rys., wykr.
Twórcy
autor
autor
- West Pomeranian University of Technology in Szczecin, Piastów 19, 70-310 Szczecin, Poland, akochmanska@zut.edu.pl
Bibliografia
- [1] Wang, Y., Chen, W., Microstructures, properties and high temperature carburization resistances of HVOF thermal sprayed NiAl intermetallic-based alloy coatings, Surface and Coatings Technology, 183 (2004) 18-24.
- [2] Du, H. L., Kipkemoi, J., Tsipas, D. N., Datta, P. K., The high temperature corrosion behavior of Hf modified chromo-aluminised coatings produced by a single step process, Surface and Coatings Technology, 86-87 (1996) 1-8.
- [3] Wang, K.-L., Chen, F.-S., Leu, G.-S., The aluminizing and Al-Si codeposition on AISI HP alloy and the evaluation of their carburizing resistance, Material Science and Engineering, A 357 (2003) 27-38.
- [4] Christodulu, P., Kubicki, J, Piekarski, B., Patent 148506, 28.02.1990 (in Polish).
- [5] Christodulu, P., Doctor's Thesis, Szczecin University of Technology, Poland, 1984 (in Polish).
- [6] Kubicki, J, Piekarski, B., Structure and carburization resistance of Al-Cu casting coatings, Proc. Conf. "ATM'98", AGH Kraków, Vol. 2, 1104-1107 (in Polish).
- [7] Kochmańska, A., Kochmański, P., Structure of multilayer aluminium-silicon coatings, Maintenance and Reliability, No 2 (18) (2003) 37-40 (in Polish).
- [8] Garbiak, M., Piekarski, B., Kubicki, J., Anti-carburization coatings in high alloyed Ni-Cr cast steel, Proc. 10th Inter. Baltic. Conf. "Materials Engineering & Baltrib" (2001) Latvia, 125-129.
- [9] Kubicki J., Piekarski B., Methods of improvement of resistance to carburization of creep-resistant cast steels. Metalurgija, Metallurgy (2001) Vol. 40, No 1, 47-50.
- [10] Kubicki J., Kochmański P., Effect of carburization and thermal shocks on structure of Al-Si casting coatings. Archives of Mechanical Technology and Automation (2001) Vol. 1, No 1, 212-219 (in Polish).
- [11] Piekarski B., Improving the resistance to carburizing of creep-resistant castings, Archives of Foundry Engineering (2008) Vol. 8, No 4, 181-184.
- [12] Kochmańska A., Doctor's thesis, Szczecin University of Technology, Poland, 2006 (in Polish).
- [13] Kubicki J., Kochmańska A., Kochmański P., Carbon diffusion protective Al-Si coatings on high temperature creep resistant cast steel, Archives of Mechanical Technology and Automation (2008) Vol. 28, No 1, 83-88 (in Polish).
- [14] Kochmańska A., Kochmański P., Carbon diffusion protective Al-Si coatings on high temperature creep resistant cast steel, Acta Metallurgica Slovaca, Special Issue No 1 (2007) Kosice, 873-878.
- [15] Kochmańska A., Anticarburizing coatings of thermal shocks resistance obtained with slurry method, Material Engineering (2008) No 6, 679-682 (in Polish).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPZ1-0063-0029