Mechanical Behavior of Glass/Porous Alumina by Contact Loading

유리/다공성 알루미나의 접촉하중에 의한 기계적 거동

  • Kim, Chul (School of Mechanical Systems Engineering, Kookmin University) ;
  • Kim, Sang Kyum (School of Mechanical Systems Engineering, Kookmin University) ;
  • Kim, Tae Woo (School of Mechanical Systems Engineering, Kookmin University) ;
  • Lee, Kee Sung (School of Mechanical Systems Engineering, Kookmin University)
  • 김철 (국민대학교 기계시스템공학부 기계설계전공) ;
  • 김상겸 (국민대학교 기계시스템공학부 기계설계전공) ;
  • 김태우 (국민대학교 기계시스템공학부 기계설계전공) ;
  • 이기성 (국민대학교 기계시스템공학부 기계설계전공)
  • Received : 2014.07.28
  • Accepted : 2014.09.01
  • Published : 2014.09.30


Porous alumina with different porosities, 5.2 - 47.5%, were coated with cover-glass having a thickness of $160{\mu}m$, using epoxy adhesive. We investigated the effect of the porosity of the substrate layer on the crack initiation load, and the size of cracks propagated in the coating layer. Hertzian indentations were used to evaluate the damage behavior under a constrained loading condition. Typically, two types of cracks, ring cracks and radial cracks, were observed on the surface of the glass/porous alumina structure. Indentation stress-strain curves, crack initiation loads, crack propagation sizes, and flexural strengths were investigated as a function of porosities. The results indicated that a porosity of less than 30% and a higher substrate elastic modulus were beneficial at suppressing cracks occurrence and propagation. We expect lightweight mechanical components with high strength can be successfully fabricated by coating and controlling porosities in the substrate layer.


Supported by : 국민대학교


  1. A. A. Tracton, Coatings Technology Handbook; pp. 18-1-45-7, CRC Tayler & Francis, New York, 2006.
  2. S. C. Tjong and H. Chen, "Nanocrystalline Materials and Coatings," Mater. Sci. Eng. R, 45 [1-2], 1-88 (2004).
  3. B. R. Lawn, K. S. Lee, H. Chai, A. Pajares, D. K. Kim, S. Wuttiphan, I. M. Peterson, and X. Hu, "Damage-resistant Coatings," Adv. Eng. Mater., 11, 745-48 (2000).
  4. K. S. Lee, B. K. Jang, and Y. Sakka, "Damage and Wear Resistance of $Al_2O_3$-CNT Nanocomposites Fabricated by Spark Plasma Sintering," J. Ceram. Soc. Jpn., 121, 867-72 (2013).
  5. J. Wei and L. R. Dharani, "Fracture Mechanics of Laminated Glass Subjected to Blast Loading," Theor. Appl. Fract. Mech., 44 [2] (2005).
  6. J. H. Park, E. Lee, T. W. Kim, H. J. Yim, and K. S. Lee, "Fracture Behavior fo Glass/Resin/Glass Sandwich Structures with Different Resin Thicknesses," J. Mech. Sci. Technol., 34, 81849-56 (2010).
  7. C. Ortiz and M. C. Boyce, "Bioinspired Structural Materials," Science, 319 [5866], 851-6 (2008).
  8. B. R. Lawn, S. Bhowmick, M. B. Bush, T. Qasim, E. D. Rekow, and Y. Zhang, "Failure Modes in Ceramic-Based Layer Structures : A Basis for Materials Design of Dental Crowns," J. Am. Ceram. Soc., 90, 1671-83 (2007).
  9. S. K. Woo, K. S. Lee, I. S. Han, D. W. Seo, and Y. O. Park, "Role of Porosity in Dust Cleaning of Silicon Carbide Ceramic Filters," J. Ceram. Soc. Jpn., 109 [9], 742-47 (2001).
  10. K.-J. Lee, J.-W. Park, J.-K. Yang, K.-S. Lee, and Y.-H. Choa, "Synthesis and Optimization of Nano-Porous $La_{0.6}Sr_{0.4}CoO_{3-{\delta}}$ on the Oxygen Separation Membrane," Mater. Sci. and Eng. A, 449-451, 774-77 (2007).
  11. D. H. Lee and K. S. Lee, "Mechanical Behavior of Layered YSZ Thermal Barrier Coatings Using Indentation Test(in Korean)," J. Korean Ceram. Soc., 48 [5], 396-403 (2011).
  12. C. M. Herveran, J. Xu, V. K. Sarin, and S. N. Basu, "Simulation of Stresses in TBC-EBC Coating Systems for Ceramic Components in Gas Turbines," Surf. Coat. Technol., 235 [14-15], 354-60 (2013).
  13. J. Kimmel, N. Miriyala, J. Price, K. More, P. Tortorelli, H. Eaton, G. Linsey, and E. Sun, "Evaluation of CFCC Liners with EBC after Field Testing in a Gas Turbine," J. Eur. Ceram. Soc., 22, 2769-75 (2002).
  14. K. S. Lee, K. S. Jang, J. H. Park, T. W. Kim, I. S. Han, and S. K. Woo, "Designing the Fiber Volume Ratio in SiC Fiber-Reinforced SiC Ceramic Composites under Hertzian Stress," Mater. Des., 32 [8-9], 4394-401 (2011).
  15. B. T. Richards and H. N. G. Wadley, "Plasma Spray Deposition of Tri-layer Environmental Barrier Coatings," J. Eur. Ceram. Soc., 34 [12], 3069-83 (2014).
  16. K. Holmberg, H. Ronkainen, A.Laukkanen, and K. Wallin, "Friction and Wear of Coated Surfaces - Scales, Modelling and Simulation of Tribomechanism," Surf. Coat. Technol., 202 [4-7], 1034-49 (2007).
  17. R. Ahmad, J.-H. Ha, and I.-H. Song, "Enhancement of the Compressive Strength of Hightly Porous $Al_2O_3$ Foam through Crack Healing and Improvement of the Surface Condition by Dip-coating," Ceram. Int., 40 [2], 3679-85 (2014).
  18. K. S. Lee, S. K. Kim, C. Kim, T. W. Kim, and D. K. Kim "Cracking of Densely Coated Layer Adhesively Bonded to Porous Substrates Under Hertzian Stress," J. Mater. Sci., 42 [21], 9116-20 (2007).
  19. B. R. Lawn, "Indentation of Ceramic with Spheres : A Century After Hertz," J. Am. Ceram. Soc., 81 [8], 1977-94 (1998).
  20. K. S. Lee, Y. W. Rhee, D. H. Blackburn, and B. R. Lawn, "Cracking of Brittle Coatings Adhesively Bonded to Substrates of Unlike Modulus," J. Mater. Res., 15 [8], 1653-56 (2000).
  21. F. W. Zok and C. G. Levi, "Mechanical Properties of Porous-Matrix Ceramic Composites," Adv. Eng. Mater., 3, 15-23 (2001).<15::AID-ADEM15>3.0.CO;2-A
  22. K. S. Lee, D. W. Seo, J. H. Yu, and S. K. Woo, "A Study on the Improvement of Strength in NiO-YSZ Porous Anode Material for Solid Oxide Fuel Cell(in Korean)," J. Kor. Ceram. Soc., 40 [3], 241-8 (2003).