Journal of Materials Science

, Volume 44, Issue 5, pp 1351–1356 | Cite as

Microstructure and property enhancement of silicon nitride-barium aluminum silicate composites with β-Si3N4 seed addition

  • Bo WangEmail author
  • Jun Yang
  • Rui Guo
  • Jiqiang Gao
  • Jianfeng Yang


Si3N4-barium aluminum silicate (BAS) self-reinforced composites have been prepared by pressureless sintering at 1800 °C for 2 h. The β-Si3N4 seeds incorporated in the starting α-Si3N4 powders encouraged the α- to β-Si3N4 phase transformation, and the final bimodal microstructure with large grains, consequently, led to the improvement of the fracture toughness, from 7.74 to 8.34 MPa m1/2. The almost-complete crystallized BAS benefited the high-temperature mechanical properties. The residual stress, crack deflection, grain bridging, and pullout were considered as the major toughening mechanisms in this composite.


Fracture Toughness Silicon Nitride Crack Deflection Pressureless Sinter Bimodal Microstructure 



The authors wish to express thanks the financial support of the State Education Ministry of the People’s Republic of China (RFDP Program (20060698008)).


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Bo Wang
    • 1
  • Jun Yang
    • 1
  • Rui Guo
    • 1
  • Jiqiang Gao
    • 1
  • Jianfeng Yang
    • 1
  1. 1.State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an CityPeople’s Republic of China

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