Fig. 1. Fabrication process of α-Al2O3 ceramics.
Fig. 2. X-ray diffraction pattern of α-Alumina powder.
Fig. 3. The scanning electron microscopy (SEM) ×10,000 images of α-Alumina powders.
Fig. 4. Particle size distribution of alumina powder were taken by the particle size analyzer (PSA).
Fig. 5. Variations of their shirinkage rate as a function of sintering temperature for the disk samples which were pressed uni-axially and isostatically, respectively.
Fig. 6. The scanning electron microscopy (SEM) ×10,000 images of samples uniaxial pressed and sintered at (a) 1,200℃, (b) 1,300℃, (c) 1,400℃, (d) 1,450℃, (e) 1,500℃, and (f) 1,600℃ and isostatical pressed and sintered at (g) 1,200℃, (h) 1,300℃, (i) 1,400℃, (j) 1,450℃, (k) 1,500℃, and (l) 1,600℃ for 2 h.
Fig. 7. Variations of their sintered (a) densities, and (b) porosity as a function of sintering temperature for the disk samples which were pressed uniaxially and isostatically, respectively.
Fig. 9. Indentations of vicker’s hardness tester of samples uniaxially pressed and sintered at (a) 1,200℃, (a) 1,300℃, (c) 1,400℃, (d) 1,450℃, (e) 1,500℃, and (f) 1,600℃ and uniaxially pressed and sintered at (g) 1,200℃, (g) 1,300℃, (g) 1,400℃, (g) 1,450℃, (g) 1,500℃, and (g) 1,600℃.
Fig. 10. Realationship between grain size and vickers hardness of Al2O3 sintered at various temperatures which were pressed uniaxially and isostatically, respectively.
Fig. 8. Variations of their (a) vickers hardness and (b) fracture toughness as a function of sintering temperature for the disk samples which were pressed uni-axially and isostatically, respectively.
Table 1. Variations of their green density, and sintered density and porosity as a function of sintering temperature for the disk samples which were pressed uniaxially and isostatically, respectively.
참고문헌
- B. An, W. Wang, G. Ji, S. Gan, G. Gao, J. Xu, and G. Li, Energy, 35, 45 (2010). [DOI: https://doi.org/10.1016/j.energy.2009.08.027]
- R. G. Munro, J. Am. Ceram. Soc., 80, 1919 (1997). [DOI:https://doi.org/10.1111/j.1151-2916.1997.tb03074.x]
- W. L. Suchanek, J. Am. Ceram. Soc., 93, 399 (2010). [DOI:https://doi.org/10.1111/j.1551-2916.2009.03399.x]
- Y. Yoshizawa, K, Hirao, and S. Kanzaki, J. Eur. Ceram. Soc., 24, 325 (2004). [DOI: https://doi.org/10.1016/S0955-2219(03)00226-7]
- S. van der Gijp, J. E. ten Elshof, O. Steigelmann, and H. Verweij, J. Am. Ceram. Soc., 83, 2610 (2000). [DOI: https://doi.org/10.1111/j.1151-2916.2000.tb01597.x]
- H. L. Marcus and M. E. Fine, J. Am. Ceram. Soc., 55, 568 (1972). [DOI: https://doi.org/10.1111/j.1151-2916.1972.tb13438.x]
- M. L. Gall, A. M. Huntz, B. Lesage, C. Monty, and J. Bernardini, J. Mater. Sci., 30, 201 (1995). [DOI: https://doi.org/10.1007/BF00352151]
- D. Chakravarty, S. Bysakh, K. Muraleedharan, T. N. Rao, and R. Sundaresan, J. Am. Ceram. Soc., 91, 203 (2008). [DOI: https://doi.org/10.1111/j.1551-2916.2007.02094.x]
- J. Liu, H. Yan, and K. Jiang, Ceram. Int., 39, 6215 (2013). [DOI: https://doi.org/10.1016/j.ceramint.2013.01.041]
- J. Sun, L. Gao, and W. Li, Chem, Mater., 14, 5169 (2002). [DOI: https://doi.org/10.1021/cm020736q]
- I. Ahmad, H. Cao, H. Chen, H. Zhao, A. Kennedy, and Y. Q. Zhu, J. Eur. Ceram. Soc., 30, 865 (2010). [DOI: https://doi.org/10.1016/j.jeurceramsoc.2009.09.032]
- L. Gao, H. Z. Wang, J. S. Hong, H. Miyamoto, K. Miyamoto, Y. Nishikawa, and S.D.D.L. Torre, J. Eur. Ceram. Soc., 19, 609 (1999). [DOI: https://doi.org/10.1016/S0955-2219(98)00232-5]
- A. R. Yazdi, H. Baharvandi, H. Abdizadeh, J. Purasad, A. Fathi, and H. Ahmadi, Mater. Des., 37, 251 (2012). [DOI:https://doi.org/10.1016/j.matdes.2011.12.038]
- Z. Shen, M. Johnsson, Z. Zhao, and M. Nygren, J. Am. Ceram. Soc., 85, 1921 (2002). [DOI: https://doi.org/10.1111/j.1151-2916.2002.tb00381.x]
- H. Mizuta, K. Oda, Y. Shibasaki, M. Maeda, M. Machida, and K. Ohshima, J. Am. Ceram. Soc., 75, 469 (1992). [DOI: https://doi.org/10.1111/j.1151-2916.1992.tb08203.x]
- D. E. Niesz, KONA Powder Part. J., 14, 44 (1996). [DOI:https://doi.org/10.14356/kona.1996009]
- N. Ozkan and B. J. Briscoe, J. Eur. Ceram. Soc., 17, 697 (1997). [DOI: https://doi.org/10.1016/S0955-2219(96)00090-8]
- A. Eksi and M. K. Kulekci, Metalurgija, 43, 129 (2004). [DOI: http://hrcak.srce.hr/128360]
- M.L.V. Mahesh, V.V.B. Prasad, and A. R. James, Eur. Phys. J. B, 89, 108 (2016). [DOI: https://doi.org/10.1140/epjb/e2016-60390-6]
- D. W. Shin, D. H. Yoon, C. J. Kim, Y. S. Chung, and K. H. Auh, J. Ceram. Soc. Jpn., 106, 363 (1998). [DOI: https://doi.org/10.2109/jcersj.106.363]
- R. Armstrong, I. Codd, R. M. Douthwaite, and N. J. Petch, Philos. Mag. A, 7, 45 (1962). [DOI: https://doi.org/10.1080/14786436208201857]
- A. G. Evans and E. A. Charles, J. Am. Ceram. Soc., 59, 371 (1976). [DOI: https://doi.org/10.1111/j.1151-2916.1976.tb10991.x]
- E. O. Hall, Proc. Phys. Soc., London, Sect. B, 64, 747 (1951). [DOI: https://doi.org/10.1088/0370-1301/64/9/303]
- A. M. Glezer, N. A. Shurygina, E. N. Blinova, I. E. Permyakova, and S. A. Firstov, J. Mater. Sci. Technol., 31, 91 (2015). [DOI:https://doi.org/10.1016/j.jmst.2014.09.006]