Modeling and Optimization of the Fabrication of Al₂O₃- Based Ceramocomposites Reinforced with Carbon Nanotubes

Abstract:

The physico-mechanical properties of ceramic-matrix Al₂O₃-based composites are strongly influenced by the particle size of Al₂O₃, the presence of carbon nanotubes (CNTs), and the temperature regimes of sintering. In order to obtain the very low porosity ceramic composites with high rates of flexural strength and crack resistance, mathematical models were developed for grinding the particles of Al₂O₃ and spark plasma sintering of the composite. Mathematical models were based on the equations of the balance of the number of particles by size taking into account their grinding (for the grinding stage), the balance of pores in the composite by the size (for the sintering stage). The kinetic parameters of mathematical models were determined and a good agreement was reached between the calculated and experimental results. The developed models were used to determine the optimal modes of grinding and sintering stages, which made it possible to obtain, in particular, the composite Al₂O₃ - CNT (20 vol. %) with bending strength 540 MPa, and crack resistance 6.3 MPa·m^1/2.

• Periodical: Materials Science Forum (Volume 995)
• Pages: 27-33
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.995.27
• Online since: June 2020
• Authors: Eleonora Koltsova*, Natalia Mamonova, Anna Shaneva, Michael Babkin, Nelly Popova, Eugene Zharikov
• Keywords: Alumina, Carbon Nanotubes, Modeling, Optimization

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