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Crack healing in liquid-phase-pressureless-sintered silicon carbide–aluminum nitride composites
Authors:Giuseppe Magnani  Leandro Beaulardi  Alida Brentari  Takehiro Toyoda  Koji Takahashi
Affiliation:1. Universidade de São Paulo – Escola de Engenharia de Lorena, USP-EEL – Pólo Urbo-Industrial, Gleba AI-6, s/n, Lorena-SP, CEP. 12600-000, Brazil;2. Universidade do Estado do Rio de Janeiro, Faculdade de Tecnologia — UERJ-FAT, Rodovia Presidente Dutra, km 298, Resende-RJ, CEP 27511-971, Brazil;3. Universidade Federal de São João del-Rei, Departamento de Mecânica – UFSJ-CENEN, Campus Sto. Antônio – Praça Frei Orlando 170 – Centro, S. J. del-Rei-MG. CEP 36.307-352, Brazil;4. Instituto Militar de Engenharia – IME, Pça. General Tibúrcio, 80, Praia Vermelha, Rio de Janeiro – RJ, CEP 22290-270, Brazil;5. Centro Universitário de Volta Redonda – Pró-Reitoria de Pesquisa e Extensão, UNIFOA – Av. Paulo Erlei Alves Abrantes, 1325 – Três Poços, V.Redonda-RJ, Brazil;1. Pyrometallurgy Lab., Minerals Technology Dep., Central Metallurgical R&D Institute (CMRDI), P.O Box 87, Cairo, Egypt;2. Chemistry Dep., Faculty of Science, Zagazig University, Zagazig, Egypt
Abstract:Crack healing in liquid-phase-pressureless-sintered SiC–AlN composites was investigated by introducing cracks into specimens and subsequently heat-treating the specimens. It was observed that cracks were healed and the strength was recovered. Cracks were filled with silica or mullite produced by the oxidation of the composites. It was shown that the healing temperature could be fixed in the range 1100–1300 °C and that large cracks up to about 300 μm could be healed completely. Our results imply that a simple oxidation heat-treatment can improve the reliability of silicon carbide–aluminum nitride components.
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