Abstract
A new technique—series electro-pulse discharge (SEPD)—was developed as a surface coating process. In this process, both positive and negative poles of a pulse power were used as the depositing electrodes and the substrate alloy was used as an induction electrode. The physical process for such SEPD was tested by measuring the relationship between the discharge voltages and gaps in a pin-plate-pin system. Microcrystalline Ni20Cr alloy coatings and oxidedispersed Ni20Cr alloy coatings were prepared on Ni20Cr alloy surface by using a vibrating SEPD device. Oxidation at 950°C in ambient air showed that the microcrystalline Ni20Cr alloy coatings greatly improved the oxidation resistance of the substrate alloy. The addition of dispersed Y2O3 nano-particles into the microcrystalline coatings was found to further reduce the oxidation rate and enhance the oxide spallation resistance.
Similar content being viewed by others
References
Roger, N. J., Electro-spark deposited coatings for High Temperature Wear and Corrosion Applications. Elevated Temperature coatings science and tecnology I, The Minerals (eds. Dahotre, N. B. Hampikian, J. M., Stiglich, J. J.), Metals & Materials Society, 1995, 265–277.
Chen Zhongxie, Electro-spark Strengthening Process (in Chinese), Beijing: Mechanical Industry Press, 1987, 1.
Chen Zhongxie, The Electro-spark strengthening of metallic surface. Electric Process (in Chinese), 1978, (2): 3–12.
Roger, N. J., Sheldon, G. L., Advances in electro-spark deposition coating process, J. Vac. Sci. Technol. 1986, A4(6): 2740–2746.
Raghunathan, S., Stiglich, J. J., Sudarshan, T. S., Characterization of Ir/10W deposited by pulsed electrode surfacing (PES), Elevated Temperature Coatings: Science and Technology I, The Minerals (eds. Dahotre, N. B. Hampikian, J. M., Stiglich, J. J.), Metals & Materials Society, 1995, 303–312.
He, Y., Huang, Z., Qi, H. et al. Oxidation behaviour of microcrystalline Ni-20Cr-Y2O3 ODS alloy coatings, Materials Letters, 2000, 45: 79–85.
Huang Zufen, He Yedong, Wang Deren et al., Aluminizing coating and aluminizing-Y2O3 coating deposited by pulsed spark. Journal of Rare Earths, 2001, 19(2): 150–153.
Wang, P. Z., Pan, G. S. et al., Accelerated electrospark deposition and the wear behavior of coatings. Journal of Materials Engineering and Performance, 1997, 6(6): 780–784.
Pang Hongmei, Qi Huibin, High-frequency electro-pulse deposition of micro-crystallized MGH754 ODS alloy coatings, Science in China, Series B, 2000, 43 (5): 540–546.
Pang Hongmei, He Yedong. Oxidation behavior of aluminide microcrystalline coatings produced by high-fre-quency eletro-spark deposition. Acta Metallurgica Sinica (in Chinese) 2000, 36 (9): 975–978.
Birks, N., Meier, G. H., Introduction to High Temperature Oxidation of Metals, New York: Edward Arnold Ltd, 1983, 80–83.
Pieraggi, B., Rapp, R. A., Chromia scale growth in alloy oxidation and the reactive element effect. J. Electrochem Soc., 1993, 140(10): 2844–2850.
Stringer, J., The reactive element effect in high-temperature corrosion, Mater. Sci. Eng., 1989, A120: 129–137.
Hou, P. Y., Stringer, J., The effect of surface-applied reactive metal oxides on the high temperature oxidation of alloys. Mater. Sci. Eng. 1987, 87: 295–302.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Xu, Q., He, Y., Wang, D. et al. Microcrystalline coatings deposited by series double-pole electro-pulse discharge and its high-temperature oxidation behavior. Sci. China Ser. E-Technol. Sci. 45, 477–484 (2002). https://doi.org/10.1360/02ye9055
Received:
Issue Date:
DOI: https://doi.org/10.1360/02ye9055