Structure and Properties of Graphite-Molybdenum Brazed Joints

Authors

  • S. Maksymova Brazing Department, Paton Electric Welding Institute of the NAS of Ukraine, 11, K. Malevych St., Kyiv, 03150, Ukraine
  • V. Voronov Brazing Department, Paton Electric Welding Institute of the NAS of Ukraine, 11, K. Malevych St., Kyiv, 03150, Ukraine
  • P. Kovalchuk Brazing Department, Paton Electric Welding Institute of the NAS of Ukraine, 11, K. Malevych St., Kyiv, 03150, Ukraine
  • A. Larionov Brazing Department, Paton Electric Welding Institute of the NAS of Ukraine, 11, K. Malevych St., Kyiv, 03150, Ukraine

DOI:

https://doi.org/10.56801/MME989

Keywords:

graphite; molybdenum; brazed joints; brazing filler metal; structure; properties.

Abstract

The paper presents the results of X-ray microspectral studies of dissimilar brazed joints of molybdenum with graphite. It is shown that during active brazing of graphite with molybdenum, mutual diffusion processes occur, and the adhesion-active brazing filler metals penetrates into graphite, and interacts with it, which leads to the formation of carbide phases. When using the Ti-Cr-V and Cu-Ti-Ni systems brazing filler metals, titanium carbides are formed. The zirconium carbides are formed, when using the brazing filler metals based on the Zr-Pd(Mo) systems and the CxMey(Mo, Cr) carbides  are formed using the brazing filler metals of the Pd-Ni-Cr-Ge system. The results of tests for three-point bending showed that the using of Pd-Ni-Cr-Ge brazing filler metals provides stable strength at the level of 34-37 MPa, destruction occurs along graphite.

References

Frohs, W. and H. Jaeger, Industrial Carbon and Graphite Materials: Raw Materials, Production and Applications. 2021: John Wiley & Sons.

Zhou, Z.-J., Z.-H. Zhong, and C.-C. Ge, Silicon doped carbon/Cu joints based on amorphous alloy brazing for first wall application. Fusion engineering and design, 2007. 82(1): p. 35-40.

Crossreff

Zhong, Z., Z. Zhou, and C. Ge, Brazing of doped graphite to Cu using stress relief interlayers. Journal of materials processing technology, 2009. 209(5): p. 2662-2670.

Crossreff

Staffler, R., et al. Metal/graphite-composites in fusion engineering. in IEEE Thirteenth Symposium on Fusion Engineering. 1989. IEEE.

Hiraoka, Y. and S. Nishikawa, Joining of single-crystalline molybdenum and carbon-ceramics by using palladium and palladium-silver alloy as brazing metal. International Journal of Refractory Metals and Hard Materials, 1996. 14(5-6): p. 311-317.

Crossreff

E. Petrunin: Reference book on brazing, M., Mashinostroenie, (2003). 480.

Šmid, I., et al., Brazed graphite/refractory metal composites for first-wall protection elements. Journal of nuclear materials, 1991. 179: p. 169-172.

Crossreff

M. H. Horner, P. W. Trester, P.G. Valentine: Patent US 006554179B2, B23K 31/02, (2003).

А. Doria, F. Gnesotto, M. Monari, In: Proceedings, 14th IEEE/NPSS Symposium, San Diego, CA, USA 1992, p. 952-955.

Maksymova, S., P. Kovalchuk, and V. Voronov, Vacuum brazing of Kovar-molybdenum dissimilar joints. The Paton Welding J., 7, 13-18. 2021.

T. Tits, J. Wilson: Refractory metals and alloys, Translation from English: Metallurgia, (1968). 352.

Fedotov, I., et al., Study of the microstructure and thermomechanical properties of Mo/graphite joint brazed with Ti–Zr–Nb–Be powder filler metal. Journal of Materials Science, 2021. 56: p. 11557-11568.

Crossreff

Dong, L., et al., Metallurgical and mechanical examinations of molybdenum/graphite joints by vacuum arc pressure brazing using Ti-Zr filler materials. Journal of Materials Processing Technology, 2017. 249: p. 39-45.

Crossreff

Li, S., et al., A review on filler materials for brazing of carbon-carbon composites. Reviews on Advanced Materials Science, 2021. 60(1): p. 92-111.

Crossreff

Singh, M., R. Asthana, and T. Shpargel, Brazing of carbon–carbon composites to Cu-clad molybdenum for thermal management applications. Materials Science and Engineering: A, 2007. 452: p. 699-704.

Crossreff

Singh, M. and R. Asthana, Characterization of brazed joints of CC composite to Cu-clad-Molybdenum. Composites Science and Technology, 2008. 68(14): p. 3010-3019.

Crossreff

Zhang, L., et al., Preparation of the graphene nanosheets reinforced AgCuTi based composite for brazing graphite and Cu. Journal of Alloys and Compounds, 2019. 782: p. 981-985.

Crossreff

Chen, Z., et al., Surface modification on wetting and vacuum brazing behavior of graphite using AgCu filler metal. Surface and Coatings Technology, 2018. 348: p. 104-110.

Crossreff

Duo, L., et al., Brazing of C/C composite and Ti-6Al-4V with graphene strengthened AgCuTi filler: Effects of graphene on wettability, microstructure and mechanical properties. Chinese Journal of Aeronautics, 2018. 31(7): p. 1602-1608.

Crossreff

Yu. V. Naydich, G. A. Kolisnechenko: The Interaction of metals melts with diamond and graphite surface. Kiev, Naukova Dumka. (1990).

Lu, Q., et al., TZM/graphite interface behavior in high-temperature brazing by Ti-based brazing filler materials. Welding in the World, 2020. 64: p. 1877-1885.

Crossreff

V. Khorunov, S. Maksymova, S. Samokhin, V. Ivanchenko, In: Procceedings of the Third Intern, Conference. «High temperature capillarity» (HTC-2000), Japan, Osaka, 2001, p. 419-424.

Massalski, T., Вinary alloy phase diagrams.—. American Society for metals. Ohiо: Metals Park: ASM International: СD, 1990.

Radzievskii, V. and G. Tkachenko, High-temperature vacuum brazing in compressor manufacturing K. Ekotekhnologia. p, 2009. 400.

Wei, Y., et al., Microstructure and performance of graphite/TZM alloy joints with different interfacial structures formed by vacuum diffusion bonding. International Journal of Refractory Metals and Hard Materials, 2020. 92: p. 105287.

Crossreff

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How to Cite

S. Maksymova, V. Voronov, P. Kovalchuk, and A. Larionov. 2023. “Structure and Properties of Graphite-Molybdenum Brazed Joints”. Metallurgical and Materials Engineering 29 (1):115-28. https://doi.org/10.56801/MME989.

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Research