study ceramic materials with a matrix of Al2O3 strengthened with different amounts of Ti nanoparticles (0.0 wt%, 0.5 wt%, 1.0 wt%,
2.0 wt% and 3.0 wt%) were generated. High energy milling was used to mix the
materials in a planetary mill type, in which powder particles were obtained
with sizes of ~300 nm. These powders were uniaxially compacted in cylindrical
samples using 350 MPa pressure. These samples were sintered at 1500°C for 1, 2
and 3 h and at 1400°C, 1500°C and 1600°C during 2 h. Microstructure
observations were made with optical microscopy and scanning electron
microscopy. Dense composites were identified with a homogeneous distribution of
fine particles. Concerning the measurement results of fracture toughness, which
were estimated by the indentation fracture method, it was shown that the
composites made by mean procedure present higher values than the average of the
monolithic alumina, up to 200%. Photographic evidence of arrest of crack growth
by titanium particles was obtained, demonstrating that the reinforcement
mechanism of these materials is due to the deflection of cracks owing to metallic
bridges formed by the titanium used as alumina strengthener.
Cite this paper
Esparza-Vázquez, S. , Rocha-Rangel, E. , Rodríguez-García, J. and Hernández-Bocanegra, C. (2014) Strengthening of Alumina-Based Ceramics with Titanium Nanoparticles. Materials Sciences and Applications
, 467-474. doi: 10.4236/msa.2014.57050
 Auerkari, P. (1996) Mechanical and Physical Properties of Engineering Alumina Ceramics. Technical Research Centre of Finland, VTT Manufacturing Technology, Research Notes 1792, 3-36.
 Wessel, J.K. (2004) The Handbook of Advanced Materials. John Wiley & Sons Ltd., New York.http://dx.doi.org/10.1002/0471465186
 Shackelford, J.F. and Doremus, R.H. (2010) Ceramic and Glass Materials: Structure, Properties and Processing. Springer, Berlin.
 Ighodaro, O.L. and Okoli, O.I. (2008) Fracture Toughness Enhancement for Alumina Systems: A Review. International Journal of Applied Ceramic Technology, 5, 313-323. http://dx.doi.org/10.1111/j.1744-7402.2008.02224.x
 Konopka, K. and Szafran, M. (2006) Fabrication of Al2O3-Al Composites by Infiltration Method and Their Characteristics. Journal of Materials Processing Technology, 175, 266-270. http://dx.doi.org/10.1016/j.jmatprotec.2005.04.046
 Marci, C. and Katarzyna, P. (2007) Processing, Microstructure and Mechanical Properties of Al2O3-Cr Nanocomposite. Journal of the European Ceramic Society, 27, 1273-1277. http://dx.doi.org/10.1016/j.jeurceramsoc.2006.05.093
 Miranda, J.G., Soto, A.B. and Rocha, E. (2006) Production and Characterization of Al2O3-Cu Composite Materials. Journal of Ceramic Processing Research, 7, 311-314.
 Lieberthal, M.I. and Kaplan, K. (2001) Processing and Properties of Al2O3 Nanocomposites Reinforced with Sub-Micron Ni and NiAl2O4. Materials Science and Engineering, A302, 83-91. http://dx.doi.org/10.1016/S0921-5093(00)01358-7
 Lalande, J., Scheppokat, S., Jansen, R. and Claussen, N. (2002) Toughening of Alumina/Zirconia Ceramic Composites with Silver Particles. Journal of the European Ceramic Society, 22, 2165-2168. http://dx.doi.org/10.1016/S0955-2219(02)00031-6
 Travirskya, N., Gotmanb, I. and Claussen, N. (2003) Alumina-Ti Aluminide Interpenetrating Composites: Microstructure and Mechanical Properties. Materials Letters, 57, 3422-3426. http://dx.doi.org/10.1016/S0167-577X(03)00090-9
 Evans, A.G. and Charles, E.A. (1976) Fracture Toughness Determination by Indentation, Journal of the American Ceramic Society, 59, 371-372. http://dx.doi.org/10.1111/j.1151-2916.1976.tb10991.x