Abstract
This paper was carried out to assess the crack-healing behavior of ZrO2 composite ceramics. The ZrO2 composite ceramics were made by adding 10 wt.% SiC and TiO2. The TiO2 additives were changed to 1, 3 and 5 wt.%. The characteristics of crack-healing behavior were studied as a function of annealing temperature and time. Specimens were mirror polished. The cracks of about 100 μm were introduced on the specimen surface by Vickers indenter and specimen were heat-treated. The strength of crack-healing was conducted by a three-point bending, and the each specimens was measured by XRD. The results obtained in this study are as follows: The ZST composite ceramics contained crack-healing properties, and the strength of ZST smooth specimens have been shown to be better than ZS specimens. The optimum crack-healing condition of the ZTS3 specimen was 1073 K, 5 hours in the air. Specimens with heat treatment had micro-cracks and large cracks on the surface, but the micro-cracks on the surface did not affect the bending strength. It was found that specimens display phase transformation from tetragonal crystal to monoclinic crystal after heat treatment.
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Ki Woo Nam, Ph.D is working on Department of Materials Science and Engineering, Pukyong National University, Busan, Korea. He has an interest in the manufacturing and the strength evaluation of ceramic.
Jin Ryang Hwang, Master’s degree, is studying in Interdisciplinary Program of Mechanical Engineering, Graduate School, Pukyong National University, Busan, Korea. She is interested in the high-temperature structural materials and the crack healing of ceramics.
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Nam, K.W., Hwang, J.R. The crack healing behavior of ZrO2/SiC composite ceramics with TiO2 additive. J Mech Sci Technol 26, 2093–2096 (2012). https://doi.org/10.1007/s12206-012-0521-5
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DOI: https://doi.org/10.1007/s12206-012-0521-5