Authors
1 Materials and Energy Research Center, Division Of Advance Materials and Nanotechnology, Karaj , Iran.
2 Islamic Azad University, Science and Research Branch, Tehran, Iran.
3 Materials and Energy Research Center, Division Of Advance Materials and Nanotechnology, Karaj,Iran.
Abstract
The purpose of this study, Alumina and Silicon carbide-based nano-composite processing is due to the special properties and wide applications of these nano-composites have attracted much attention in various industries. In this paper, the mechanical properties of Al2O3 -4.1% wt SiC nanocomposites sintered without pressure by adding a
weight percent of nano-MgO has been studied .Nano powders of α-Al2O3,β-SiC and MgO were used as starting materials in this study .At First, a certain amount of nano-powders Al2O3 - SiC for the first sample and Al2O3 - SiC-MgO for a second sample to powder ratio of 20 to 1 by a planetary ball mill for 4 h speed 250 RPM mixture and the resulting powder Mesh 150 Mu passes and was calcined at 600 C ˚. The effect of MgO nano powder obtained samples for mechanical properties of nano-composites, Al2O3 - SiC were tested for hardness.
Keywords
- Rahaman, M.N, 2004 "Ceramic Processing and Sintering", Marcel Dekke Institute, Second Edition, New York, USA, pp.209-324.
- J. Lin, C.P. Tsang, The effect of starting precursors on the carbothermal synthesis of SiC powders, Ceram. Int. 29 (2003) 69–75.
- Magnani, A. Brillante, Effect of the composition and sintering process on mechanical properties and residual stresses in zirconia–alumina composites, J. Eur. Ceram. Soc. 25 (15) (2005) 3383–3392.
- Taktak, M.S. Baspinar, Wear and friction behavior of alumina/mullite composite by sol–gel infiltration technique, Mater. Des. 26 (5) (2005)459–464.
- Niihara, New design concept of structural ceramics–ceramic nanocomposites,J. Ceram. Soc. Jpn. 99 (10) (1991) 974–982.
- Sternitzke, Review: structural ceramic nanocomposites, J. Eur. Ceram.Soc. 17 (1997) 1061–1082.
- Perez-Rigueiro, J.Y. Pastor, J. Llorca, M. Elices, P. Miranzo, J.S. Moya, Revisiting the mechanical behavior of alumina/silicon carbide nanocomposites, Acta Mater. 46 (15) (1998) 5399–5411.
- L. Coble, Sintering crystalline solids. II. Experimental test of diffusion models in powder compacts, J. Appl. Phys. 32 (5) (1961) 793–799.
- O. Bae, S. Baik, Critical concentration of MgO for the prevention of abnormal grain growth in alumina, J. Am. Ceram. Soc. 77 (10) (1994) 2499–2504
- Takigawa, Y., Ikuhara, Y., Sakuma, T., 1999, "Grain Boundary Bonding State and Fracture Energy in Small Amount of Oxide-Doped Fine-Grained Al2O3 ", Journal of Material Science, 34, pp. 1991_1997.
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