Control of the Composition Profile of Tungsten-Copper Functionally Graded Materials for Fusion Technology Application

Abstract:

This work aims to process W-Cu FGM for fusion material applications, in particular plasma facing components (PFC). Currently, PFCs are made by multi-material assembly and rely on tungsten armour tile (high heat flux side) which needs to be cooled by the attachment to a heat sink (Cu-alloys). The interfaces in multi-material assembly are unfavourable for the application (high working temperature, thermal fatigue). The use of FGM can be a new promising way. The aim of this study is to analyze the effect of a composition/grain size variation on the liquid phase migration during liquid phase sintering of FGM, in order to control the final composition profile. Bi-layer materials are processed by powder metallurgy route. W-Cu compositions with 10 and 20wt%Cu and with different W-particle sizes are processed starting with attritor-milled W-CuO powder mixtures which are reduced at 350°C. Analysis of copper liquid phase migration for different composition/grain size associations indicates that the phenomenon is driven by differential sinterability in the gradient. The copper liquid migration depends on the differences in sinterability, on the available liquid and open porosity in the structure beyond the melting point of copper. From these analyses, a way to control the gradient profile of W-Cu structure can be proposed.

• Periodical: Materials Science Forum (Volumes 631-632)
• Pages: 279-284
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.631-632.279
• Online since: October 2009
• Authors: Jean Joel Raharijaona, Jean Michel Missiaen, Raphael Mitteau, Aurelie Thomazic
• Keywords: Functionally Graded Material (FGM), Fusion Technology, Powder Metallurgy (PM), Sintering, Tungsten-Copper

References

[1] F. A. Da Costa, A. G. P. Da Silva and U. Umbelino Gomes, Powder Technology 134 (2003) 123.

[2] F. Doré, C. H. Allibert, R. Baccino and F. Lartigue, in 15th International Plansee Seminar, edited by G. Kneringer, P. Rödhammer and H. Wildner (Reutte, 2001) p.81.

[3] J. L. Johnson and L. K. Tan, Metal injection molding of heat sinks, in Electronics cooling, (2004).

[4] B. K. Kim and S. H. Hong, in Powder Metallurgy World Congress 2000, edited by K. Kosuge and H. Nagai (Japan Society of Powder and Powder Metallurgy, Kyoto, 2000) p.682.

[5] J. S. Lee, T. H. Kim and T. G. Kang, in Powder Metallurgy World Congress PM94 (Ed. de Physique, Paris (France), 1994) p.1501.

[6] S. S. Ryu, Y. D. Kim and I. H. Moon, Journal of Alloys and Compounds 335 (2002) 233.

[7] R. Mitteau, J. M. Missiaen, P. Brustolin, O. Ozer, A. Durocher, C. Ruset, C. P. Lungu, X. Courtois, C. Dominicy, H. Maier, C. Grisolia, G. Piazza and P. Chappuis, in 24th SOFT (Varsow (Poland), 2006).

DOI: 10.1016/j.fusengdes.2007.01.003

[8] D. E. Jech, J. L. Sepulveda and A. B. Traversone, Process for making improved net shape or near net shape metal parts, (Brush Wellman, Inc., U.S.A., 1999).

[9] D. G. Kim, G. S. Kim, M. J. Suk, S. T. Oh and Y. D. Kim, Scripta Materialia 51 (2004) 677.

[10] J. -J. Raharijaona, J. M. Missiaen and R. Mitteau, Effect of oxygen content on the sintering of tungsten/copper powder mixtures, in Euro Powder Metallurgy Congress 2007, (Toulouse, France, 2007).

[11] F. Doré, S. Lay, N. Eustathopoulos and C. H. Allibert, Scripta Materialia 49 (2003) 237.

DOI: 10.1016/s1359-6462(03)00244-6