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2022
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info:eu-repo/semantics/openAccess
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Universidad Nacional de Educación a Distancia (España), Universidad Politécnica de Madrid. Departamento de Ingeniería Mecánica
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Resumen
Os avanços na área da tecnologia e ciência dos materiais têm possibilitado grande evolução e contribuição para o desenvolvimento de materiais cerâmicos. Pesquisas associadas a esse tipo de material estão cada vez mais difundidas por apresentar características como: alta dureza, biocompatibilidade, estabilidade térmica, inércia química e resistência à corrosão. Entretanto, seu uso acaba sendo limitado por sua fragilidade. Recentemente, novos materiais cerâmicos reforçados com grafeno têm sido desenvolvidos para superar essas desvantagens. Esta pesquisa trata da fabricação e caracterização mecânica do compósito Al2O3-MLG. Partindo de um pó cerâmico de Al2O3 e adicionando diferentes concentrações, 0,5%; 0,75%; 1,0% e 1,25%, em peso de MLG em sua matriz, corpos de prova foram fabricados através da mistura em meio úmido dos pós, secagem da mistura, compactação dos pós secos e posterior sinterização com atmosfera redutora. As amostras obtidas pelo método proposto foram submetidas a caracterização física, microestrutural e mecânica, sendo comparadas diretamente a amostra contendo apenas Al2O3. A análise dos resultados indicou que a utilização de concentrações menores que 1,0% em peso de MLG, proporcionou a fabricação de compósitos com excelentes propriedades mecânicas, maior dispersão e menor formação de aglomerados.
Advances in the area of technology and materials science enabled major evolution and contribution to the development of ceramic materials. Research associated with this type of material is becoming more widespread due to characteristics such as: high hardness, biocompatibility, thermal stability, chemical inertia and corrosion resistance. However, its use ends up being limited by its fragility. Recently, new ceramic materials reinforced with graphene were generated to overcome these drawbacks. This research is about the fabrication and mechanical characterization of the Al2O3-MLG composite. Starting from an Al2O3 ceramic powder and adding different concentrations, 0,50%; 0,75%; 1,0% and 1,25% by weight of MLG in their matrix, samples were fabricated by wet powder mixing, drying of the mixture, dry powder compaction and subsequent sintering with reducing atmosphere. The samples obtained by the proposed method were subjected to physical, microstructural and mechanical characterization, being directly compared to the sample containing only Al2O3. The analysis of the results indicated that the use of concentrations lower than 1.0% by weight of MLG, allowed the fabrication of composites with excellent mechanical properties, greater dispersion and less formation of agglomerates.
Advances in the area of technology and materials science enabled major evolution and contribution to the development of ceramic materials. Research associated with this type of material is becoming more widespread due to characteristics such as: high hardness, biocompatibility, thermal stability, chemical inertia and corrosion resistance. However, its use ends up being limited by its fragility. Recently, new ceramic materials reinforced with graphene were generated to overcome these drawbacks. This research is about the fabrication and mechanical characterization of the Al2O3-MLG composite. Starting from an Al2O3 ceramic powder and adding different concentrations, 0,50%; 0,75%; 1,0% and 1,25% by weight of MLG in their matrix, samples were fabricated by wet powder mixing, drying of the mixture, dry powder compaction and subsequent sintering with reducing atmosphere. The samples obtained by the proposed method were subjected to physical, microstructural and mechanical characterization, being directly compared to the sample containing only Al2O3. The analysis of the results indicated that the use of concentrations lower than 1.0% by weight of MLG, allowed the fabrication of composites with excellent mechanical properties, greater dispersion and less formation of agglomerates.
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Categorías UNESCO
Palabras clave
Fabricação, Propriedades mecânicas, Compósito
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Centro
E.T.S. de Ingenieros Industriales
Departamento
Mecánica