Oxidation of Nb/Nb₅Si₃ In Situ Composites Fabricated via Spark Plasma Sintering with Al Addition

Abstract:

Dense Nb/Nb₅Si₃ composites were fabricated via spark plasma sintering technology using Nb, Si, and Al elemental powders as raw materials. The microstructures of the synthesised composites were analysed through scanning electron microscopy, X-ray diffraction, and electron probe microanalysis. The results show that the composites consisted of residual Nb particle phase and Nb₅Si₃ phase. The microstructure of the Nb/ Nb₅Si₃ in situ composites was evidently affected by Al addition, which prompted the formation of the Al₃Nb₁₀Si₃ phase. The oxidation resistance of the Nb/Nb₅Si₃ in situ composites significantly improved with the increase in Al addition. Pesting oxidation behaviour was exhibited at 800°C by the Nb-20Si composites when exposed to air for 4h. This pest oxidation behaviour is not exhibited by the Nb-20Si-10Al and Nb-20Si-15Al composites after exposure to air for ~10h. The composite exhibits the best oxidation resistance at 15at% Al.

• Periodical: Applied Mechanics and Materials (Volume 376)
• Pages: 49-53
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.376.49
• Online since: August 2013
• Authors: Wen Yuan Long, Xiang Yan Zou, Wei Dong Wang, Jun Ping Yao
• Keywords: High-Temperature Alloys, Microstructure, Oxidation Resistance, Spark Plasma Sintering (SPS)

References

[1] W. -Y. Kim, H. Tanaka, S. Hannda, Intermetallics 2002; 10: 625-634.

[2] X.L. Wang, G.F. Wang, K.F. Zhang. Mater. Sci. Eng. A 2010; 527: 3253–3258.

[3] C.L. Yeh, W.H. Chen, J. Alloy Compd. 2006; 425: 216-222.

[4] Z. Chen, Y. -W. Yan, J. Alloy Compd. 2006; 413: 73-76.

[5] J. Geng, P. Tsakiropoulos, G. Shao, Intermetallics 2007; 15: 69-76.

[6] K. Chattopadhyay, G. Balachandran, R. Mitra, K.K. Ray, Intermetallics 2006; 14: 1452-1460.

[7] I. Grammenos, P. Tsakiropoulos. Intermetallics 2010; 18: 242-253.

[8] K. Zelenitsas, P. Tsakiropoulos. Mater. Sci. Eng. A 2006; 416: 269–280.

[9] Y. W. Kang, S. Y. Qu, J. X. Song, Q. Huang, Y. F. Han. Mater. Sci. Eng. A 2012; 534: 323–328.

[10] K. Chattopadhyay, R. Sinha, R. Mitr, K.K. Ray. Mater. Sci. Eng. A 2007; 456: 358–363.

[11] S. Miura, Y. Murasato, Y. Sekito, et al. Mater. Sci. Eng. A 2009; 510–511: 317–321.

[12] J. Geng, P. Tsakiropoulos, G. Shao. Intermetallics 2006; 14: 227-235.

[13] I. Grammenos, P. Tsakiropoulos. Intermetallics 2010; 18: 1524-1530.

[14] I. Grammenos, P. Tsakiropoulos. Intermetallics 2011; 19: 1612-1621.

[15] O. Mamoru, Mater. Sci. Eng. A 2000; 287: 183-188.

[16] T. Murakami, S. Sasaki, K. Ichikawa, A. Kitahara. Intermetallics, 2001; 9: 621–627.

[17] Z. Chen, Y.W. Yan. J. Alloy Compd. 2006; 413: 73-76.

[18] B.W. Xiong, W. Y. Long, Zh. Chen, et al. J. Alloy Compd. 2009; 471: 404-407.

[19] J. Geng, P. Tsakiropoulos, G. Shao. Mater. Sci. Eng. A, 441 (2006) 26~38.