The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Anisortopy of the Silicon Nitride Prepared by Tape Casting

  • Published : 1999.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

Silicon nitride ceramics with highly oriented microstructure were prepared by tape casting a slurry containing 5 wt% of the silicon nitride whiskers. The whiskers were aligned in the casting direction and worked as seeds for the grain growth. The anisotropy was observed from the sintering shrinkage, Vickers indentation crack lengths, and XRD patterns. The cracks were much longer on the surface normal to the aligned grains than on the tape casting surface where the lateral cracks were also observed. The effect of sintering additives and the annealing treatment on the indentation crack length was examined. The sample with higher silica content had longer cracks than the one with lower silica content. The crack length anisotropy increased after annealing at 2123K.

Keywords

References

  1. Acta. Metall. v.31 no.4 Crack Deflection Processes I. Theory K. T. Faber;A. G. Evans
  2. J. Am. Ceram. Soc. v.77 no.10 Fabrication of Oriented SiC-Whisker-Reinforced Mullite Matrix Composites by Tape Casting M. Wu;G. L. Messing
  3. Ceram. Eng. Sci. Proc. v.13 Development of β-Si₃N₄for Self-Reiforced Composites D. E. Wittmer;D. Doashi;T. E. Paulson
  4. J. Am. Ceram. Soc. v.78 no.6 Processing Strategy for Highly Anisotropic Silicon Nitride M. Brito;S. Kanzaki;M. Ohashi;K. Hirao
  5. J. Am. Ceram. Soc. v.76 no.6 Mechanical Properties of Unidirectionally Oriented SiC-Whikser-Reinforced Si₃N₄Fabricated by Extrusion and Hot-Pressing Y. Goto;A. Tsuge
  6. J. Am. Ceram. Soc. v.75 no.10 Microstructure of an Extruded β-Silicon Nitride Whisker-Reinforced Silicon Nitride Composite D. Muscat;M. D. Pugh;R. A. L. Drew;H. Pickup;D. Steele
  7. J. Am. Ceram. Soc. Anisotropy of the Silicon Nitride with Alighed Silicon Nitride Whiskers D.-S. Park;C.-W. Kim
  8. MRS Bull. v.20 no.2 Using Microstructure to Attack the Brittle Nature of Silicon Nitide Ceramics P. F. Becher;S.-L. Hwang;C-H. Hsueh
  9. J. Am. Ceram. Soc. v.78 no.9 Effect of the Grain Boundary Thermal Expansion Coefficient on the Fracture Toughness in Silicon Nitride I. M. Peterson;T.-Y. Tien
  10. Ceramics v.25 no.2 Effects of Composition and Microstructure on the Characteristics of Silicon Nitride K. Koga
  11. J. Mater. Sci. v.3 The Strength of Two-Phase Ceramic/Glass Materials R. W. Davidge;T. J. Green