DOI QR코드

DOI QR Code

Strength and Reliability of Porous Ceramics Measured by Sphere Indentation on Bilayer Structure

  • Ha, Jang-Hoon (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Jong-Ho (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technolog) ;
  • Kim, Do-Kyung (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology)
  • 발행 : 2004.07.01

초록

The importance of porous ceramics has been increasingly recognized and adequate strength of porous ceramics is now required for structural applications. Porosities of porous ceramics act as flaws in inner volume and outer surface which result in severe strength degradation. The effect of pore structure, however, on strength and reliability of porous ceramics has not been clearly understood. We investigate the relationship between pore structure and mechanical properties using a sphere indentation on bilayer structure, porous ceramic top layer with soft polymer substrate. Porous alumina and silica were prepared to characterize the isolated pore structure and interconnected pore structure, respectively. The porous ceramic with 1mm thickness were bonded to soft polycarbonate substrate and then fracture strengths were estimated from critical loads for radial cracking of porous ceramics during sphere indentation from top surface. This simple and reproducible technique provides Weibull modulus of strength of porous ceramics with different pore structure. It shows that the porous ceramics with isolated pore structure have higher strength and higher Weibull modulus as well, than those with interconnected pore structure even with the same porosity.

키워드

참고문헌

  1. J. Am. Ceram. Soc. v.39 no.11 Effect of Porosity on Physical Properties of Alumina R. L. Coble;W. D. Kingery https://doi.org/10.1111/j.1151-2916.1956.tb15608.x
  2. J. Mater. Sci. v.31 Evaluation and Extension of Physical Property-Porosity Models Based on Minimum Solid Area R. W. Rice https://doi.org/10.1007/BF00355133
  3. J. Am. Ceram. Soc. v.60 no.7-8 Empirical Dependence of Elastic Moduli in Porosity for Ceramic Materials E. A.. Dean;J. A. Lopez https://doi.org/10.1111/j.1151-2916.1977.tb15558.x
  4. J. Am. Ceram. Soc. v.45 no.2 Effect of Porosity on Young's Modulus of Alumina F. P. Knudsen https://doi.org/10.1111/j.1151-2916.1962.tb11089.x
  5. J. Appl. Mater. v.50 Analysis of Composite Materials-A Survey Z. Hashin
  6. J. Am. Ceram. Soc. v.76 no.10 Effective Elastic Moduli of Ceramic Materials N. Ramakrishnan;V. S. Arunachalam https://doi.org/10.1111/j.1151-2916.1993.tb04011.x
  7. Cellular Solids-Structure and Properties L. J. Gibson;M. F. Ashby
  8. J. Ceram. Soc. Jpn. v.112 no.5 Elasticity and Thermal Conductivity of Porous Ceramics with Controlled Pore Structure J. H. Ha;J. H. Kim;D. K. Kim
  9. J. Kor. Ceram. Soc. v.41 no.1 Indentation Damage of Porous Alumina Ceramics J. H. Ha;C. S. Lee;J. H. Kim;D. K. Kim https://doi.org/10.4191/KCERS.2004.41.1.019
  10. Phys. Rev. E. v.69 Size Independence of the Strength of Snow H. O. K. Kirchner;H. Peterlik;G. Michot
  11. J. Appl. Mech. v.18 A Statistical Distribution Function of Wide Applicability W. Weibull
  12. J. Mater. Res. v.17 no.12 Overview : Damage in Brittle Layer Structures from Concentrated Loads B. R. Lawn;Y. Deng;P. Miranda;A. Pajares;H. Chai;D. K. Kim https://doi.org/10.1557/JMR.2002.0440
  13. J. Mater. Res. v.18 no.1 Effect of an Adhesive Interlayer on the Fracture of a Brittle Coating on a Supporting Substrate J. H. Kim;P. Miranda;D. K. Kim;B. R. Lawn https://doi.org/10.1557/JMR.2002.0440
  14. K. Mater. Res. v.18 no.6 Modeling of Effects of Adhesive Interlayers on Contact-Induced Radial Cracking in Brittle Coatings on Substrates C. H. Hsueh;J. H. Kim;D. K. Kim https://doi.org/10.1557/JMR.2003.0031
  15. J. Mater. Res. v.19 no.3 Effect of Sol-Gel Thin Coatings on The Fracture Strength of Glass E, Sanchez-Gonzalez;P. Miranda;A. Diaz-Parralejo;A. Pajares;F. Guiberteau https://doi.org/10.1557/jmr.2004.19.3.896
  16. J. Mater. Res. v.19 no.2 Strength of Silicon Containing Nanoscale Flaws A. Pajares;M. Chumakov;B. R. Lawn https://doi.org/10.1557/jmr.2004.19.3.896
  17. ASTM, E1876-1 Standard Test Method For Dynamic Young's Modulus Shear Modulus and Poisson's Ratio by Impulse Excitation of Vibration ASTM https://doi.org/10.1557/jmr.2004.19.2.657
  18. "Standard Test Method For Dynamic Young's Modulus, Shear Modulus and Poisson's Ratio by Impulse Excitation of Vibration," ASTM, E1876-1 (2001).