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      Determinação da espessura de filme bioativo SiO2-CaO-P2O5 obtido via sol-gel Translated title: Evaluation of the thickness of SiO2-CaO-P2O5 bioactive film obtained via sol-gel

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          Abstract

          Foi preparado um filme bioativo do sistema SiO2-CaO-P2O5 via sol-gel pela hidrólise e condensação de TEOS, TEP, álcool e nitrato de cálcio em meio ácido. Após a mistura, a solução sintetizada serviu para revestir substrato de aço inoxidável pelo método de imersão utilizando baixa velocidade de emersão. Após o revestimento, o compósito foi tratado termicamente em diferentes temperaturas durante 1 h, com o propósito de avaliar a influência do tratamento térmico especificamente na espessura do filme revestindo o substrato metálico. A influência da variação da temperatura foi acessada através das técnicas de microscopia eletrônica de varredura (MEV) e espectroscopia de centelhamento (GDS). Os resultados comprovaram a influência da temperatura na espessura do filme obtido. A reduzida espessura do filme bioativo foi determinada por MEV e GDS.

          Translated abstract

          A sol-gel bioactive film of the SiO2-CaO-P2O5 system was prepared, via a sol-gel method, by hydrolysis and condensation of tetraethylortosilicate [TEOS], triethylphosphate [TEP] and hydrated calcium nitrate under acidic conditions. After mixing, the as-obtained solution was used to coat stainless steel substrates by dip-coating in a low withdraw speed. After deposition, the composite was heat treated at different temperatures for 1 h to evaluate the temperature influence on the thickness of the coating over the stainless steel substrate. The development of the coating thickness was accessed through the techniques of scanning electronic microscopy (SEM) and glow discharge spectroscopy (GDS). Results indicated the heat treatment effect on the film thickness. Also, the SEM and the GDS techniques were used to determine the thin bioactive coating thickness.

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          Strain-rate sensitivity of glasses

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                ce
                Cerâmica
                Cerâmica
                Associação Brasileira de Cerâmica (São Paulo )
                1678-4553
                June 2009
                : 55
                : 334
                : 177-180
                Affiliations
                [1 ] Instituto Nacional da Propriedade Industrial
                [2 ] Universidade Federal de Minas Gerais Brazil
                Article
                S0366-69132009000200010
                10.1590/S0366-69132009000200010
                dedafae1-a2bc-471a-ac75-67cff612a4bd

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0366-6913&lng=en
                Categories
                MATERIALS SCIENCE, CERAMICS

                Ceramics
                sol-gel,bioactive film,thickness,filme bioativo,espessura
                Ceramics
                sol-gel, bioactive film, thickness, filme bioativo, espessura

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