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High temperature flexural strength and fracture toughness of AlN with Y2O3 ceramic

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Abstract

The effects of temperature on the fast fracture behavior of aluminum nitride with 5 wt% Y2O3 ceramic were investigated. Four-point flexural strength and fracture toughness were measured in air at several temperatures (30–1,300 °C). The flexural strength gradually decreased with the increase of temperature up to 1,000 °C due to the change in the fracture mode from transgranular to intergranular, and then became almost constant up to 1,300 °C. Two main flaw types as fracture origin were identified: small surface flaw and large pores. The volume fraction of the large pores was only 0.01%; however, they limited the strength on about 50% of the specimens. The fracture toughness decreased slightly up to 800 °C controlled by the elastic modulus change, and then decreased significantly at 1,000 °C due to the decrease in the grain-boundary toughness. Above 1,000 °C, the fracture toughness increased significantly, and at 1,300 °C, its value was close to that measured at room temperature.

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Acknowledgements

The authors acknowledge the Brazilian agencies FAPESP (The State of São Paulo Research Foundation) and CNPq (The National Council for Scientific and Technological Development) for the financial support of the present research.

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Authors and Affiliations

  1. Federal University of ABC, Rua Santa Adélia, 166, Santo André, SP, 09210-170, Brazil

    Humberto N. Yoshimura

  2. Polytechnic School of the University of São Paulo, Av. Prof. Mello Moraes, 2463, São Paulo, SP, 05508-900, Brazil

    Nilson E. Narita, André L. Molisani & Hélio Goldenstein

Authors
  1. Humberto N. Yoshimura
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  2. Nilson E. Narita
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  3. André L. Molisani
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  4. Hélio Goldenstein
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Correspondence to Humberto N. Yoshimura.

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Yoshimura, H.N., Narita, N.E., Molisani, A.L. et al. High temperature flexural strength and fracture toughness of AlN with Y2O3 ceramic. J Mater Sci 44, 5773–5780 (2009). https://doi.org/10.1007/s10853-009-3809-9

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