Journal of Materials Science

, Volume 42, Issue 10, pp 3488–3494 | Cite as

SiCf/SiC composites reinforced by randomly oriented chopped fibers prepared by semi-solid mechanical stirring method and hot pressing

  • X. H. QinEmail author
  • B. L. Xiao
  • S. M. Dong
  • D. L. Jiang


SiC short fibers, with an average diameter of 13 μm, length of 300–1,000 μm and chopped from SiC continuous fibers, were surface modified by the semi-solid mechanical stirring method to produce a discrete coating of aluminum particles. Then the starting mixtures, which consist of SiC short composite fibers, aluminum powder less than 50 μm and α-SiC powder of an average diameter of 0.6 μm, were mechanically mixed in ethanol for about 3 h, dried at 80 °C in air, and hot pressed under 30 MPa pressure at 1,650, 1,750 and 1,850 °C with 1 h holding time to prepare SiCf/SiC composites. Volume fraction of SiC short fibers in the starting powder for SiCf/SiC composites was about 25 vol.%. The composites were characterized in terms of bulk density, phase composition, and mechanical properties at room temperature. In addition, the distribution of SiC short fibers in the matrix and the cracking pattern in the composites were examined by optical microscope. Fracture surface of the composites were performed by a scanning electron microscope (SEM). The effect of hot-pressing temperature on bulk density and mechanical properties was investigated. The results indicated that SiC short fibers were uniformly and randomly distributed in the matrix, bending strength and bulk density of the composites increased with increasing sintering temperature. The composite, hot-pressed at 1,850 °C, exhibited the maximum bulk density and bending strength at room temperature, about 3.01 g/cm3 and 366 MPa, respectively. SEM analyses showed that there were a few of fiber pullout on the fracture surface of samples sintered at 1,650 °C and 1,750 °C, which was mainly attributed to lower densities. But few of fiber pullout was observed on the fracture surface of sample sintered at 1,850 °C, the combined effects of high temperature and a long sintering time were considered as a source of too severe fiber degradation because of the large amount of oxygen in the fibers.


Fracture Toughness Aluminum Particle Composite Powder Short Fiber Aluminum Powder 



We would like to thank Prof. C. G. Fan, L. J. Rong and Y. Y. Li from Institute of Metal Research, Chinese Academy of Sciences, for providing us with facilities and their valuable help in the preparation of this manuscript and technical assistance.


  1. 1.
    Capoto AG, Lackey WJ (1984) Ceram Eng Sci Proc 5:654CrossRefGoogle Scholar
  2. 2.
    Naslain R (2004) Compos Sci Technol 64:155CrossRefGoogle Scholar
  3. 3.
    Naslain R, Pailler R, Bourrat X, Bertrand S, Heurtevent F, Dupel P, Lamouroux F (2001) Solid State Ionics 141–142:541CrossRefGoogle Scholar
  4. 4.
    Takeda M, Kagawa Y, Mitsuno S, Imai Y, Ichikawa H (1999) J Am Ceram Soc 82:1579CrossRefGoogle Scholar
  5. 5.
    Zheng G, Sano H, Uchiyama Y, Kobayashi K, Suzuki K, Cheng H (1998) J Ceram Soc Japan 106:1155CrossRefGoogle Scholar
  6. 6.
    Tanaka T, Tamari N, Kondo I, Iwasa M (1998) Ceram Int 24:365CrossRefGoogle Scholar
  7. 7.
    Luthra KL, Singh RN, Brun MK (1993) Amer Ceram Soc Bull 72(7):79Google Scholar
  8. 8.
    Hilling WB (1994) Am Cera Soc Bull 73:56Google Scholar
  9. 9.
    Kohyama A, Dong SM, Katoh Y (2002) Ceram Eng Sci Proc 23(3):311CrossRefGoogle Scholar
  10. 10.
    Katoh Y, Kohyama A, Dong SM, Hinoki T, Kai JJ (2002) Ceram Eng Sci Proc 23(3):363Google Scholar
  11. 11.
    Katoh Y, Dong SM, Kohyama A (2002) Ceram Trans 144:77Google Scholar
  12. 12.
    Lee JS, Imai M, Yano T (2003) Mater Sci Eng A 339:90CrossRefGoogle Scholar
  13. 13.
    Lee JS, Yano T (2004) J Eur Ceram Soc 24:25CrossRefGoogle Scholar
  14. 14.
    Qin XH, Jiang DL, Dong SM (2004) Surf Rev Lett 11:205CrossRefGoogle Scholar
  15. 15.
    Qin XH, Jiang DL, Dong SM (2004) Mater Sci Eng A385:31CrossRefGoogle Scholar
  16. 16.
    Yin L, Vancoille EY, Ramesh K, Huang H (2004) Int J Mach Tool Manu 44:607CrossRefGoogle Scholar
  17. 17.
    Jones RH, Steiner D, Heinisch HL, Newsome GA, Kerch HM (1997) J Nucl Mater 245:87CrossRefGoogle Scholar
  18. 18.
    Ishikawa T, Sato M, Kajii S, Tanaka Y, Suzuki M (2001) Ceram Eng Sci Proc 22:471CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • X. H. Qin
    • 1
    • 3
    Email author
  • B. L. Xiao
    • 2
  • S. M. Dong
    • 3
  • D. L. Jiang
    • 3
  1. 1.Research Institute for Stainless Steel, R & D CenterBaoshan Iron & Steel Co.,ShanghaiChina
  2. 2.General Research Institute for Nonferrous MetalsBeijingChina
  3. 3.Shanghai Institute of Ceramics, Chinese Academy of SciencesShanghaiChina

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