Advertisement

Journal of Materials Science

, Volume 30, Issue 5, pp 1173–1179 | Cite as

Mechanical properties of monolithic AIN and SiCw/AIN composites

  • C. K. Unni
  • D. E. Gordon
Papers

Abstract

Flexural, tensile, and high cycle fatigue test data are presented for pressureless sintered aluminium nitride (AIN) and hot-pressed aluminium nitride reinforced with silicon carbide whiskers (SiCw/AIN). Tests were conducted at ambient temperature. The SiCw/AIN composites consisting of 30wt% SiCw produced significant increases in flexural strength, tensile strength, and tensile fatigue strength compared to monolithic AIN. Increases were nearly double in all cases. Corresponding strain-to-failures measured in tensile tests increased from ∼ 0.04% in monolithic AIN to ∼ 0.10% in the SiCw reinforced composite. Fracture surfaces showed evidence of whisker-toughening mechanisms due to additions of SiCw whiskers. High-cycle fatigue results indicated that both materials have the ability to sustain higher stress levels in the cyclic tests compared to the tensile experiments. The improved performance under cyclic testing is explained in terms of strain-rate effects. The times at or near peak stress are considerably less under high-cycle fatigue testing (20 Hz) compared to tensile tests (strain rate = 0.5%min−1).

Keywords

Fatigue Tensile Test Flexural Strength Fatigue Strength High Stress Level 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    P. F. Becher, C. H. Hsueh, P. Angelini and T.N. Tiegs, J. Am. Ceram. Soc. 71 (1988) 1050.CrossRefGoogle Scholar
  2. 2.
    P. F. Becher and G. C. Wei, ibid. 67 (1984) C-267.CrossRefGoogle Scholar
  3. 3.
    P. F. Becher and T. N. Tiegs, in “Engineered Materials Handbook”, Vol. 1, “Composites,” (ASM International, Metals Park, OH, 1987) pp. 941.Google Scholar
  4. 4.
    P. F. Becher, T. N. Tiegs and P. Angelini, “Fiber Reinforced Ceramics,” edited by K. S. Mazdiyasni (Noyes, Park Ridge, NJ) in press.Google Scholar
  5. 5.
    P. Angelini, W. Mader and P. F. Becher, in, “MRS Proceedings: Advanced Structural Ceramics,” Vol. 78, edited by P. F. Becher, M. V. Swain and S. Somiya (Materials Research Society, Pittsburgh, PA, 1987) p. 241.Google Scholar
  6. 6.
    P. F. Becher and T.N. Tiegs, Adv. Ceram. Mater. 3 (1988) 148.CrossRefGoogle Scholar
  7. 7.
    G. A. Slack, “Aluminium Nitride Crystal Growth, Final Report on Contract F49620-78-C-0021,” Directorate of Electronic and Solid State Sciences, Bolling AFB, DC (December 1979).Google Scholar
  8. 8.
    J. A. Kohn P. G. Colten, and R. A. Potter, Am. Mineral. 41 (1956) 355.Google Scholar
  9. 9.
    C. O. Dugger, “The Single Crystal Synthesis and Some Properties of Aluminium Nitride”, AF CRL-TR-75-0486, Air Force Cambridge Research Laboratories (August 1975).Google Scholar
  10. 10.
    C. K. Unni, General Dynamics IR&D, unpublished data (1990).Google Scholar
  11. 11.
    F. S. Pettit, Trans. AIME 239 (1967) 1296.Google Scholar
  12. 12.
    R. Ruh and A. Zangvil, J. Am. Ceram. Soc. 65 (1982) 260.CrossRefGoogle Scholar
  13. 13.
    S. Y. Kuo, A. V. Virkar and W. Rafaniello, ibid. 70 (1987) C-125.CrossRefGoogle Scholar
  14. 14.
    W. Rafaniello, M. R. Plichta and A. V. Virkar, ibid. 66 (1983) 272.CrossRefGoogle Scholar
  15. 15.
    L. D. Bentson and D. P. H. Hasselman, ibid. 66 (1983) C-40.Google Scholar
  16. 16.
    W. Rafaniello, K. Cho and A. V. Virkar, J. Mater. Sci. 16 (1981) 3479.CrossRefGoogle Scholar
  17. 17.
    R. Ruh, Am. Ceram. Soc. Bull. 64 (1985) 1368.Google Scholar
  18. 18.
    M. Landon and F. Thevenot, Ceram. Int. 17 (1991) 97.CrossRefGoogle Scholar
  19. 19.
    K. Komeya and F. Noda, Toshiba Rev. 92 (1974) 13.Google Scholar
  20. 20.
    A. V. Krylov, S. M. Barinov, D. A. Ivanov, N. A. Mindlina, L. Parilak, J. Dusza, F. Lofaj and E. Rudnarpeva, J. Mater. Sci. 12 (1993) 904.Google Scholar
  21. 21.
    Y. Xu, A. Zangvil, M. Landon and F. Thevenot, J. Am. Ceram. Soc. 75 (1992) 325.CrossRefGoogle Scholar
  22. 22.
    Y. Yamada, A. Kawasaki, J. Li, M. Taya, and R. Watanobe, J. Jpn Inst. Metals 56 (1992) 1078.CrossRefGoogle Scholar
  23. 23.
    DuPont Corporation, unpublished data.Google Scholar

Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • C. K. Unni
    • 1
  • D. E. Gordon
    • 2
  1. 1.M and J TechnologiesOdessaUSA
  2. 2.Lockheed, Fort Worth CompanyFort WorthUSA

Personalised recommendations