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Improving the strength of brazed joints to alumina by adding carbon fibres

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Abstract

The addition of short, bare, carbon fibres to a silver-based active brazing alloy (63Ag-34Cu-2Ti-1Sn) resulted in up to 30% improvement in the shear/tensile joint strength of brazed joints between stainless steel and alumina. The optimum fibre volume fraction in the brazing material was 12%. This improvement is attributed to the thinning and microstructural simplification of the alumina/braze reaction product (titanium-rich) layer, the softening of the brazing alloy matrix, the strengthening of the braze and the reduction of the coefficient of thermal expansion. The depth of titanium diffusion into the alumina was decreased by the fibre addition. The first two effects are due to the absorption of titanium by the fibres. This absorption resulted in less titanium in the brazing alloy matrix, a braze/fibre particulate reaction product (titanium-rich) on the fibres and the diffusion of titanium into the fibres. In contrast, the use of an active brazing alloy with a lower titanium content but without carbon fibres gave much weaker joints.

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References

  1. “Metals Handbook”, Vol. 6, “Welding, Brazing and Soldering”, 9th Edn (Handbook Committee, American Society for Metals, Metals Park, Ohio, USA, 1983)

  2. L. VEGARD, Z. Physik 5 (1921) 17.

    Article  CAS  Google Scholar 

  3. H. MIZUHARA and K. MALLY Weld J. 64(10) (1985) 27.

    CAS  Google Scholar 

  4. W. WEISE, W. MALIKOWSKI and W. BOHN, Ceram. Ind. 134(2) (1990) 38.

    Google Scholar 

  5. M. L. SANTELLA, J. A. HORTON and J. J. PAK, J. Am. Ceram. Soc. 73 (1990) 1785.

    Article  CAS  Google Scholar 

  6. G. ECONOMOS and W. D. KINGERY, ibid. 36 (1953) 403.

    Article  CAS  Google Scholar 

  7. P. R. KAPOOR and T. W. EAGAR, ibid. 72 (1989) 448.

    Article  CAS  Google Scholar 

  8. R. E. LOEHMAN and A. P. TOMSIA, Am. Ceram. Soc. Bull. 67 (1988) 375.

    CAS  Google Scholar 

  9. M. G. NICHOLAS and D. A. MORTIMER, Mater. Sci. Technol. 1 (1985) 657.

    CAS  Google Scholar 

  10. JOSEPH R. McDERMID and ROBIN A. L. DREW, J. Am. Ceram. Soc. 74 (1991) 1855.

    Article  CAS  Google Scholar 

  11. Studies in Physical and Theoretical Chemistry, 48, Proc. First Seiken Int. Symp. Interface Structure, Properties and Diffusion Bonding (Fundamentals of Diffusion Bonding), 1985, Yoichi Ishida, ed., (Elsevier, Amsterdam, 1987).

  12. BRIAN C. COAD, US PAT 4 409 181 (1983).

  13. JIMIN CAO and D. D. L. CHUNG, Weld. J. 71(1) (1992) 21.

    Google Scholar 

  14. MINGGUANG ZHU and D. D. L. CHUNG, J. Am. Ceram. Soc. 77 (1994) 2712.

    Article  CAS  Google Scholar 

  15. M. KOYAMA, S. ARAI, S. SUENAGA and M. NAKAHASHI, J. Mater. Sci. 28 (1993) 830.

    Article  CAS  Google Scholar 

  16. H. HAO, Y. WANG, Z. JIN and X. WANG, ibid. 30 (1995) 1233.

    Article  CAS  Google Scholar 

  17. “Metals Handbook”, Vol. 8, “Metallography, Structures and Phase Diagram”, Taylor Lyman, ed., 8th Edn (Handbook Committee, American Society for Metals, Metals Park, Ohio, USA, 1973).

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  1. Composite Materials Research Laboratory, State University of New York at Buffalo, Buffalo, New York, 14260-4400, USA

    Minguang Zhu & D. D. L Chung

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  1. Minguang Zhu
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  2. D. D. L Chung
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Zhu, M., Chung, D.D.L. Improving the strength of brazed joints to alumina by adding carbon fibres. Journal of Materials Science 32, 5321–5333 (1997). https://doi.org/10.1023/A:1018666827969

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