Toughened Laminated Alumina/Silica Ceramics Formed by Weakening Interlayer Bonded Strength

Abstract:

Low impact toughness is the major obstacle to impede the applications of brittle ceramics such that a very small crack may induce catastrophic fracture of the bulk components. Thus, enhancing the impact toughness of ceramics is virtually important. It is generally accepted that weakening the interlayer binding strength of the laminated material is beneficial to the fracture toughness of the laminated ceramics. In this paper, alumina / silica layered composite ceramics were prepared by impregnating the alumina interlayers with silica sol, wherein the interlayer bonding strength was controlled by adjusting the sintering temperatures from 1000°C to 1600°C. Lowing sintering temperature warrants the weak interlayer bonding strength, which results in the occurrence of the multiple bending strength-strain curves and improve the material's fracture strain and impact toughness. Crack deflection along the weak interface layer is the main mechanism for the enhanced toughness and crack tolerance. When the sintering temperature decreases from 1600°C to 1200°C, impact toughness increases from 4.42 kJ/m² to 6.95 kJ/m², and fracture strain measured by three-point bending increases from 0.25% to 0.36%. Finite element software was used to simulate the differences in stress distribution.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 200-205
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.200
• Online since: August 2018
• Authors: Wen Bo Dong, Jin Peng Fan*, Da Hai Zhang, Jin Gyi Zhang, Juan Zhang
• Keywords: Laminated Ceramics, Stress Simulation, Toughen Mechanism

References

[1] R.O. Ritchie, The conflicts between strength and toughness. Nat Mater, 2011. 10(11): pp.817-822.

[2] M.A. Meyers, J. McKittrick, P.Y. Chen, Structural biological materials: critical mechanics-materials connections. Science, 2013. 339(6121): pp.773-779.

DOI: 10.1126/science.1220854

[3] M. Kashtalyan, Y. Sinchuk, R. Piat, Stress Analysis of Cracked MMCs with Lamellar Microstructure. Key Engineering Materials, 2015. 627: pp.345-348.

DOI: 10.4028/www.scientific.net/kem.627.345

[4] J. Wang, Q. Cheng, Z. Tang, ChemInform Abstract: Layered Nanocomposites Inspired by the Structure and Mechanical Properties of Nacre. Chemical Society Reviews, 2012. 41(3): pp.1111-29.

DOI: 10.1002/chin.201217216

[5] Piat, R., M. Kashtalyan, and I. Guz, Influence of the Crack Widening on the Transverse Cracking in Lamellar Metal-Ceramic Composites. Key Engineering Materials, 2017. 754: pp.83-86.

DOI: 10.4028/www.scientific.net/kem.754.83

[6] L.B. Mao, S.K. Li, H.L. Gao, H. Cölfen, G. Liu, S.M. Chen, Y.X. Yan, H.B. Yao, Y.Y. Liu, L. Liu, S.H. Yu, Synthetic nacre by predesigned matrix-directed mineralization. Science, 2016, 354(6308):p.107.

DOI: 10.1126/science.aaf8991

[7] W.J. Clegg, K. Kendall, N.M. Alford, T.W. Button, J.D. Birchall, A simple way to make tough ceramics. Nature, 1990. 347(6292): pp.455-457.

DOI: 10.1038/347455a0

[8] C.A. Gutiérrez, R. Moreno, Tape casting of non-aqueous silicon nitride slips. Journal of the European Ceramic Society, 2000. 20(10): pp.1527-1537.

DOI: 10.1016/s0955-2219(99)00216-2

[9] J.H. Gong, Fracture Mechanics Of Ceramics. Tsinghua University Press, Beijing, (2001).