| Indentation Damage of Porous Alumina Ceramice |
| Jang-Hoon Ha, Chul-Seung Lee, Jong-Ho Kim, Do-Kyung Kim |
| Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology |
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| ABSTRACT |
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The Hertzian indentation contact damage behavior of porous alumina with controlled pore shape was investigated by experiments. Porous alumina ceramics containing well-defined pore shape, size and distribution were prepared by incorporation of fugitive spherical starch. Porous alumina with isolated pore structure was prepared with porosity range up to 30%. The indentation stress-strain curves of porous alumina were constructed. Elastic modulus and yield stress can be obtained from the stress-strain relationship. Impulse excitation method for the measurement of elastic modulus was also conducted as well as Hertzian indentation and was confirmed as a useful tool to evaluate the elasticity of highly porous ceramics. Elastic modulus of the inter-connected pore structure is more sensitive to porosity than that of the isolated pore structure. When the specimen had isolated pore structure, higher yield point was obtained than it had inter-connected pore structure. This study proposed that the elastic modiulus of porous ceramics is strongly related to not only porosity, but also the structure of pore. |
| Key words:
Elasticmodulus, Porous ceramice, Hertzian indentation, Isolated pore Inter-connected pore |
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