Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Characteristics of Crack Healing and High Temperature Strength of High Strength Sialon

고강도 사이알론의 균열치유와 고온강도 특성

  • Published : 2009.09.01
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Abstract

Sialon was produced by hot-pressing the mixtures of $Si_3N_4$, AlN and $Y_2O_3$ powders. All fracture tests were performed on a three-point loading system with a 30 mm bending span. Fracture toughness and Vickers hardness of smooth specimen were average 7.05 $MPa{\cdot}m^{0.5}$ and Hv = 1580, respectively. Density of three kinds of specimens, smooth specimen, smooth and healed specimen, smooth with $SiO_2$ colloidal coating and healed specimen, had beyond 99 % of theoretical density. Bending strength of smooth healed specimens had high strength more than 1 GPa. Crack healed specimens recovered as strength as smooth specimen. That is, cracked specimen with $SiO_2$ colloidal coating on cracked part recovered strength by heat treatment, completely. Crack healing of $Si_3N_4$ composite ceramics had contributed glassy $SiO_2$ to strength recovery. Limiting high temperature for bending strength of heat treated smooth specimen for bending strength was about 1273 K.

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References

  1. Sakano, H. and Asano, K., 1987, 'Ceramics for Automobile,' Sankaido, p. 180
  2. Kijima, K. and Shirasaki, S., 1976, 'Nitrogen Self-Diffusion in Silicon Nitride,' Journal of Chemical Physics, Vol. 65, pp. 2668∼2671 https://doi.org/10.1063/1.433464
  3. Lange, F.F., 1980, 'Silicon Nitride Systems: Fabrication Microstructure, and Properties,' Int. Metals Rev. Vol. 247, No. 1, pp. 1-20
  4. Lange, F.F., 1983, 'Fabrication and Properties of Dense Polyphase Silicon Nitride,' Bull. Am. Ceram. Soc., Vol. 62, No. 12, pp. 1369-74
  5. Nam, K.W., Moon, S.J., Park, S.W., Ahn, S.H. and Kim, J.S., 2007, 'Characteristics of Sialon by Additive Al2O3 and Y2O3,' Proceeding of The KSPSE 2007 Fall Annual Meeting, pp. 262-267
  6. Jack, K.H., 1976, 'Sialons and Related Nitrogen Ceramics,' J. Mater. Sci., Vol. 11, pp. 1135-58 https://doi.org/10.1007/BF02396649
  7. Jack, K.H. and Wilson, W.I., 1972, 'Ceramics Based on Silicon Nitride,' Nature Physical Science, Vol. 238, No. 28, pp. 128-129
  8. Nam, K.W., Kim, M.K., Park, S.W., Ahn, S.H. and Kim, J.S., 2007, 'Crack Healing Behavior and Bending Strength of $Si_3N_4$/SiC Composite Ceramics by SiO2 Colloidal,' Mater. Sci. and Engng. A, Vol. 471, pp. 102-105. https://doi.org/10.1016/j.msea.2007.03.005
  9. Nam, K.W., Park, S.W., Ahn, S.H., 2008, 'Crack-healing Behavior and Strength Properties of SiC Ceramics According to Additives $SiO_2$,' Proceeding of Korea Ocean Science Technique Council 2007 Joint Meeting, pp. 2430
  10. Wada, S. and Ukyo, Y., 1989, 'Euro-Ceramics,' Vol. 1, pp. 566-571
  11. Lawn, B.R. and Fuller, E.R., 1975, 'Equilibrium Penny-Like Cracks in Indentation on Fracture,' J. Mater. Sci., Vol. 10, pp. 2016-24 https://doi.org/10.1007/BF00557479
  12. Ye. F., Hohhman. J.M., Holzer. S. and Iwasa. M., 2004, 'Microsstructural Development of Y-$\alpha$/($\beta$)-Sialon after Post Heat-Treatment and its Effect on Mechanical Properties,' Ceramics International, Vol. 30, pp. 229-238 https://doi.org/10.1016/S0272-8842(03)00094-4
  13. Kim, M.K., Park, S.W., Son, C.S., Ahn, S.H. and Nam, K.W., 2006, 'Crack Healing and Bending Strength of $Si_3N_4$/SiC Composite Ceramics by Additive Powder $TiO_2$,' Proceeding of The KSME 2006 Fall Annual Meeting, pp. 149-152
  14. Lee, S.K., Ishida, W., Lee, S.Y., Nam, K.W. and Ando, K., 2005, 'Crack-Healing Behavior and Resultant Strength Properties of Silicon Carbide Ceramic,' J. Eur. Ceram Soc., Vol. 25, No. 5, pp. 569-576 https://doi.org/10.1016/j.jeurceramsoc.2004.01.021
  15. Ando, K., Houjyou, K., Chu, M. C., Takeshita, S., Takahashi, K., Sakamoto, S., 2002, 'Crack-Healing Behavior of $Si_3N_4$/SiC Ceramics under Stress and Fatigue Strength at the Temperature of Healing ($1000^{\circ}C$),' J. Eur. Ceram. Soc. Vol. 22, pp. 1339-1346 https://doi.org/10.1016/S0955-2219(01)00435-6