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pp.436-440
High-temperature sintering is required to obtain pure and dense alumina, but it results in excessive grain growth, which eventually deteriorates the performance of the material. Technologies have been developed to lower the sintering temperature, such as the addition of a sintering aid, but these methods may cause secondary phases and still deteriorate physical properties. In this study, pure high-density alumina sintered bodies were prepared by applying an aerodynamic levitation (ADL) process without using sintering additives. Alumina that was sintered using a furnace showed a relative sintering density of 98.3 %, while alumina produced by the ADL process showed a relative density of 99.75 %. Compared to alumina prepared with the general sintering method, ADL alumina showed about a 37 % increase in hardness. ADL alumina showed a dense microstructure, attributed to instantaneous sintering at a high temperature of 2,000 °C or higher, and crystal grain growth was suppressed by rapid cooling to room temperature, resulting in ultra-high density. The ADL method is a promising manufacturing method that can improve the mechanical properties of ceramics that need to be sintered at high temperatures, and can be used to manufacture special high-performance ceramics for application in high-temperature environments.
1. 서 론
2. 실험 방법
3. 결과 및 고찰
4. 결 론
Acknowledgement
References
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